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Effect of annealing temperature on the photoluminescence and scintillation properties of ZnO nanorods
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Open Access
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Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Christopher J Summers , Nolan E Hertel , Benjamin D B Klein , H Menkara , Sinem V Kurudirek
Yıl :
2018
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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The effect of the annealing to enhance the photoluminescence (PL) and scintillation properties, as determined by pulse height distribution of alpha particle irradiation, has been investigated for solution grown ZnO nanorods For this investigation the ZnO nanorod arrays were grown on glass for 22 h at 95 degrees C as a substrate using a solution based hydrothermal technique. The samples were first annealed for different times (30, 60, 90 and 120 min) at 300 degrees C and then at different temperatures (100 degrees C-600 degrees C) in order to determine the optimum annealing time and temperature, respectively. Before annealing, the ZnO nanorod arrays showed a broad yellow-orange visible and near-band gap UV emission peaks. After annealing in a forming gas atmosphere, the intensity of the sub-band gap PL was significantly reduced and the near-band gap PL emission intensity correspondingly increased (especially at temperatures higher than 100 degrees C). Based on the ratio of the peak intensity ratio before and after annealing, it was concluded that samples at 350 degrees C for 90 min resulted in the best near-band gap PL emission. Similarly, the analysis of the pulse height spectrum resulting from alpha particles revealed that ZnO nanorod arrays similarly annealed at 350 degrees C for 90 min exhibited the highest scintillation response. (C) 2017 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2017.08.057
Sayi :877
Sayfa :80-86
Sınıflandırma :
2
Magnetic field mapping simulations of sub -mm period undulators for the next generation X-ray free electron lasers
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
O Akdogan , O Polat , N G Akdogan
Yıl :
2020
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Öz bulunamadı.
DOI : 10.1016/j.nima.2020.164062
Sayi :969
Sınıflandırma :
3
Discrimination of gamma rays due to inelastic neutron scattering in AGATA
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
J Nyberg , S O Kara , T Huyuk , M Senyigit , S Akkoyun , A Kaskas , A Atac
Yıl :
2009
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Possibilities of discriminating neutrons and gamma rays in the AGATA gamma-ray tracking spectrometer have been investigated with the aim of reducing the background due to inelastic scattering of neutrons in the high-purity germanium crystals. This background may become a serious problem especially in experiments with neutron-rich radioactive ion beams. Simulations using the GEANT4 toolkit and a tracking program based on the forward tracking algorithm were carried out by emitting neutrons and gamma rays from the center of AGATA. Three different methods were developed and tested in order to find "fingerprints" of the neutron interaction points in the detectors. In a simulation with simultaneous emission of six neutrons with energies in the range 1-5 MeV and 10 gamma rays with energies between 150 and 1450 keV, the peak-to-background ratio at a gamma-ray energy of 1.0 MeV was improved by a factor of 2.4 after neutron rejection with a reduction of the photopeak efficiency at 1.0 MeV of only a factor of 1.25. (C) 2009 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2009.05.183
Sayi :607
issue :3
Sayfa :554-563
Sınıflandırma :
Enerji %100
Enerji %100
4
Synthesis and photoluminescence properties of Ga-doped ZnO nanorods by a low temperature solution method
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Nolan E Hertel , Christopher J Summers , Benjamin D B Klein , Murat Kurudirek , Sinem V Kurudirek
Yıl :
2018
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Gallium doped ZnO nanorods exhibiting good PL performance were grown via a solution method. The as-grown, Ga-doped, and undoped ZnO nanorods displayed a broad yellow-orange emission and a UV emission peak, respectively. By applying an annealing process, the broad yellow-orange emission almost disappeared and the UV emission increased significantly (for ZnO:Ga (1.2%) peak intensity ratio congruent to 56). With Ga doping, the UV emission peak shifted from 3.27 eV to 3.28 eV. Also, experimental results revealed that a sample doped with Ga at 1.2% by mass exhibited a stronger PL intensity than either the undoped ZnO (higher by 57% acc. to peak intensities) sample or a ZnO sample doped with Ga at 2% (higher by 88% acc. to peak intensities). Both doped and undoped samples were also tested as alpha particle scintillators, and similarly the ZnO:Ga (1.2%) nanorods were found to have higher scintillation response than ZnO:Ga (2%) or undoped ZnO.
DOI : 10.1016/j.nima.2018.07.038
Sayi :904
Sayfa :158-162
Sınıflandırma :
5
Probing spin structure of nucleons in scattering of polarized real gamma beam on polarized nuclear targets
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Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
S Turkoz , S Sultansoy , F Haciyev , A Celikel , S Atag
Yıl :
1996
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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The proposal for measurement of polarized gluon and quark distributions in the scattering of a polarized real gamma beam on a polarized nuclear target has been considered. A high energy gamma beam is obtained by backscattering of a laser beam off electrons from ring and linac type accelerators. Requirements for lasers and design problems are discussed and some process examples are given.
DOI : 10.81043/aperta.101587
Sayi :381
issue :1
Sayfa :23-31
Sınıflandırma :
6
Particle identification with a track fit chi(2)
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Ferenc Sikler
Yıl :
2010
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Tracker detectors can be used to identify charged particles based on their global chi value obtained during track fitting with the Kalman filter. This approach builds upon the knowledge of detector material and local position resolution, using the known physics of multiple scattering and energy loss. The proposed method is independent of the traditional way of identification using deposited energy. The performance for present LHC experiments is demonstrated. (C) 2010 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2010.03.098
Sayi :620
issue :2-3
Sayfa :477-483
Sınıflandırma :
7
A Monte Carlo Library Least Square approach in the Neutron Inelastic scattering and Thermal-capture Analysis (NISTA) process in bulk coal samples
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Nergis Angin , M Nizamettin Erduran , U Uner Colak , Alborz Ebrahimi , Iskender Atilla Reyhancan
Yıl :
2017
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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A new Monte-Carlo Library Least Square (MCLLS) approach for treating non-linear radiation analysis problem in Neutron Inelastic-scattering and Thermal-capture Analysis (NISTA) was developed. 14 MeV neutrons were produced by a neutron generator via the H-3(H-2,n)He-4 reaction. The prompt gamma ray spectra from bulk samples of seven different materials were measured by a Bismuth Germanate (BGO) gamma detection system. Polyethylene was used as neutron moderator along with iron and lead as neutron and gamma ray shielding, respectively. The gamma detection system was equipped with a list mode data acquisition system which streams spectroscopy data directly to the computer, event-by-event. A GEANT4 simulation toolkit was used for generating the single-element libraries of all the elements of interest. These libraries were then used in a Linear Library Least Square (LLLS) approach with an unknown experimental sample spectrum to fit it with the calculated elemental libraries. GEANT4 simulation results were also used for the selection of the neutron shielding material.
DOI : 10.1016/j.nima.2016.10.058
Sayi :843
Sayfa :29-33
Sınıflandırma :
Enerji %100
Enerji %100
8
Software emulator of nuclear pulse generation with different pulse shapes and pile-up
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Milan Vujtek , Cuneyt Celiktas , Pavel Kohout , Lukas Kouril , Petr Novak , Daniel Konecny , Jiri Pechousek
Yıl :
2016
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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The optimal detection of output signals from nuclear counting devices represents one of the key physical factors that govern accuracy and experimental reproducibility. In this context, the fine calibration of the detector under diverse experimental scenarios, although time costly, is necessary. However this process can be rendered easier with the use of systems that work in lieu of emulators. In this report we describe an innovative programmable pulse generator device capable to emulate the scintillation detector signals, in a way to mimic the detector performances under a variety of experimental conditions. The emulator generates a defined number of pulses, with a given shape and amplitude in the form of a sampled detector signal. The emulator output is then used off-line by a spectrometric system in order to set up its optimal performance. Three types of pulse shapes are produced by our device, with the possibility to add noise and pulse pile-up effects into the signal. The efficiency of the pulse detection, pile-up rejection and/or correction, together with the dead-time of the system, are therein analyzed through the use of some specific algorithms for pulse processing, and the results obtained validate the beneficial use of emulators for the accurate calibration process of spectrometric systems. (C) 2016 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2016.05.032
Sayi :828
Sayfa :81-85
Sınıflandırma :
9
Study of clustering methods to improve primary vertex finding for collider detectors
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Ferenc Sikler
Yıl :
2010
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Primary vertex finding for collider experiments is studied with the aim to detect all primary interactions. The efficiency and precision of finding interaction vertices can be improved by advanced clustering and classification methods, such as agglomerative clustering with fast pairwise nearest neighbor search, followed by Gaussian mixture model or k-means clustering. The results have been obtained with simplified simulation and Gaussian smearing, but insights on sensitivity to backgrounds are also given. (C) 2010 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2010.04.058
Sayi :621
issue :1-3
Sayfa :526-533
Sınıflandırma :
10
Pulse pile-up identification and reconstruction for liquid scintillator based neutron detectors
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
P -A Soederstroem , P -A Soederstroem , M Palacz , A Di Nitto , M Moszynski , G Jaworski , T Huyuk , A Goasduff , V Gonzalez , A Gadea , G de France , S Erturk , M N Erduran , F J Egea , J Agramunt , G de Angelis , Q Nishada , J J Valiente-Dobon , J Nyberg , V Modamio , X L Luo
Yıl :
2018
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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The issue of pulse pile-up is frequently encountered in nuclear experiments involving high counting rates, which will distort the pulse shapes and the energy spectra. A digital method of off-line processing of pile-up pulses is presented. The pile-up pulses were firstly identified by detecting the downward-going zero-crossings in the first-order derivative of the original signal, and then the constituent pulses were reconstructed based on comparing the pile-up pulse with four models that are generated by combining pairs of neutron and.. standard pulses together with a controllable time interval. The accuracy of this method in resolving the pile-up events was investigated as a function of the time interval between two pulses constituting a pile-up event. The obtained results show that the method is capable of disentangling two pulses with a time interval among them down to 20 ns, as well as classifying them as neutrons or gamma rays. Furthermore, the error of reconstructing pile-up pulses could be kept below 6% when successive peaks were separated by more than 50 ns. By applying the method in a high counting rate of pile-up events measurement of the NEutron Detector Array (NEDA), it was empirically found that this method can reconstruct the pile-up pulses and perform neutron-gamma discrimination quite accurately. It can also significantly correct the distorted pulse height spectrum due to pile-up events.
DOI : 10.1016/j.nima.2018.03.078
Sayi :897
Sayfa :59-65
Sınıflandırma :
11
Comparison of simulated and measured spectra from an X-ray tube for the energies between 20 and 35 keV
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
E Barlas Yucel , C S Ozben , A Bayrak , E Emirhan , M Yucel
Yıl :
2015
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Design and production of a simple and low cost X-ray imaging system that can be used for light industrial applications was targeted in the Nuclear Physics Laboratory of Istanbul Technical University. In this study, production, transmission and detection of X-rays were simulated for the proposed imaging device. OX/70-P dental tube was used and X-ray spectra simulated by Geant4 were validated by comparison with X-ray spectra measured between 20 and 35 keV. Relative detection efficiency of the detector was also determined to confirm the physics processes used in the simulations. Various time optimization tools were performed to reduce the simulation time. (C) 2015 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2015.07.055
Sayi :799
Sayfa :50-53
Sınıflandırma :
12
Identification and rejection of scattered neutrons in AGATA
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
L Pellegri , L Pellegri , M Palacz , B Million , C Michelagnoli , D Mengoni , J Ljungvall , R Kempley , A Gottardo , A Giaz , E Farnea , F C L Crespi , F Camera , S Brambilla , F Recchia , J Nyberg , D Bazzacco , A Kaskas , S Akkoyun , A Atac , M Senyigit
Yıl :
2014
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Kaydet Alıntıla
gamma Rays and neutrons, emitted following spontaneous fission of Cf-252, were measured in an AGATA experiment performed at INFN Laboratori Nazionali di Legnaro in Italy. The setup consisted of four AGATA triple cluster detectors (12 36 fold segmented high purity germanium crystals), placed at a distance of 50 cm from the source, and 16 HELENA BaF2 detectors. The aim of the experiment was to study the interaction of neutrons in the segmented high purity germanium detectors of AGATA and to investigate the possibility to discriminate neutrons and gamma rays with the gamma-ray tracking technique. The BaF2 detectors were used for a time measurement, which gave an independent discrimination of neutrons and gamma rays and which was used to optimise the gamma-ray tracking based neutron rejection methods. It was found that standard gamma-ray tracking, without any additional neutron rejection features, eliminates effectively most of the interaction points clue to recoiling Ge nuclei after elastic scattering of neutrons. Standard Cracking rejects also a significant amount of the events due to inelastic scattering of neutrons in the germanium crystals. Further enhancements of the neutron rejection was obtained by setting conditions on the following quantities, which were evaluated for each event by the Cracking algorithm: energy of the first and second interaction point, difference in the calculated incoming direction of the gamma ray, and figure-of-merit value. The experimental results of Cracking with neutron rejection agree rather well with GEANT4 simulations. (C) 2013 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2013.09.035
Sayi :735
Sayfa :267-276
Sınıflandırma :
Enerji %99
Enerji %98
13
NEDA-NEutron Detector Array
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
C Aufranc , C Aufranc , R Aliaga , R Wadsworth , M Palacz , J Nyberg , M Moszynski , A Gadea , N Erduran , G de France , G de Angelis , A Di Nitto , P A Soderstrom , M Jastrzab , A Triossi , T Huyuk , V Modamio , J Egea , A Goasduff , G Jaworski , J J Valiente-Dobon
Yıl :
2019
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Kaydet Alıntıla
The NEutron Detector Array, NEDA, will form the next generation neutron detection system that has been designed to be operated in conjunction with gamma-ray arrays, such as the tracking-array AGATA, to aid nuclear spectroscopy studies. NEDA has been designed to be a versatile device, with high-detection efficiency, excellent neutron-gamma discrimination, and high rate capabilities. It will be employed in physics campaigns in order to maximise the scientific output, making use of the different stable and radioactive ion beams available in Europe. The first implementation of the neutron detector array NEDA with AGATA 1 pi was realised at GANIL. This manuscript reviews the various aspects of NEDA.
DOI : 10.1016/j.nima.2019.02.021
Sayi :927
Sayfa :81-86
Sınıflandırma :
Enerji %88
Enerji %84
14
The effects of neutron irradiation and low temperature annealing on the electrical properties of highly doped 4H silicon carbide
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Joseph P Heremans , Thomas E Blue , Stephen Stone , Ekrem Almaz
Yıl :
2010
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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Kaydet Alıntıla
The effects of neutron irradiation on the electrical properties of highly doped 4H SiC were studied. The material was fabricated into standard Hall bars for characterization of the material's resistivity, free-carrier concentration and electron Hall mobility as a function of 1 MeV equivalent neutron fluence in SIC(Phi(Eq)(1MeV.SiC)). The post-irradiation effects of low temperature (175 degrees C) annealing on the same properties were also investigated. It was found that: (1) the material's resistivity doubled for (Phi(Eq)(1MeV.SiC))= 2.7 x 10(16) cm(-2), (2) the resistivity recovered (i.e. decreased) by only 8 +/- 1% from its post-irradiation values after 2 h of annealing, (3) the carrier concentration decreased linearly with Phi(Eq)(1MeV.SiC) with a carrier removal rate of similar to 48.5 +/- 6.3 cm(-1), (4) within experimental uncertainty, the carrier concentration recovered to its pre-irradiation values after 2 h of annealing, (5) the Hall mobility decreased linearly with Phi(Eq)(1MeV.SiC) with a mobility damage constant of (1.49 +/- 0.2)10(-19) Vs and (6) the Hall mobility was further degraded (i.e. decreased) by annealing. The mobility was found to decrease from its post-irradiation value by 27 +/- 8% after 2 h of annealing. (C) 2010 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2010.06.211
Sayi :622
issue :1
Sayfa :200-206
Sınıflandırma :
15
Design and performance of a hybrid fast and thermal neutron detector
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
M Zeyrek , Q Yue , I O Yildirim , S W Yang , H T Wong , A K Soma , V S Subrahmanyam , V Singh , L Singh , V Sharma , S T Lin , F K Lin , J Li , H B Li , G Kiran Kumar , G Asryan , M Agartioglu , M Deniz , A Sonay , M K Singh
Yıl :
2017
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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We report the characterization, calibration and performance of a custom-built hybrid detector consisting of BC501A liquid scintillator and BC702 scintillator for the detection of fast and thermal neutrons, respectively. Pulse Shape Discrimination techniques are developed to distinguish events due to gamma-rays, fast and thermal neutrons. Software analysis packages are developed to derive raw neutron energy spectra from measured proton recoil spectra. The validity is demonstrated through the reconstruction of the (AmBe)-Am-241(alpha,n) neutron spectrum. (C) 2017 Elsevier B. V. All rights reserved.
DOI : 10.1016/j.nima.2017.06.052
Sayi :868
Sayfa :109-118
Sınıflandırma :
Enerji %99
Enerji %94
16
Optimized estimation of energy loss rate for charged particles from energy deposit measurements in tracking detectors
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
Sandor Szeles , Ferenc Sikler
Yıl :
2012
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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The estimation of energy loss rate dE/dx for charged particles in tracking detectors using energy deposit measurements is studied. The truncated mean method is generalized to the weighted mean of the measurements. The weights are optimized for better particle separation in the energy loss rate variable, for arithmetic and geometric means, using a detailed simulation. The obtained weights are rather independent of particle momentum and track segment length. Their values are connected to the form of the corresponding energy deposit distribution, allowing for a simple universal description as a function of the number of measured track segments. While for semiconductor detectors the weighted mean estimator may be further improved with maximum likelihood methods, for gaseous detectors the (0%,55%) truncation already gives excellent results. (C) 2012 Elsevier By. All rights reserved.
DOI : 10.1016/j.nima.2012.05.090
Sayi :687
Sayfa :30-39
Sınıflandırma :
17
Future circular collider based lepton-hadron and photon-hadron colliders: Luminosity and physics
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Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
S Sultansoy , B B Oner , U Kaya , H Karadeniz , A C Canbay , S Beser , A N Akay , Y C Acar
Yıl :
2017
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
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 Piri Tam Metin Bulucu
Kaydet Alıntıla
Construction of future electron-positron colliders (or dedicated electron linac) and muon colliders (or dedicated muon ring) tangential to Future Circular Collider (FCC) will give opportunity to utilize highest energy proton and nucleus beams for lepton-hadron and photon-hadron collisions. Luminosity values of FCC based ep, mu p, eA, mu A, gamma p and gamma A colliders are estimated. Multi-TeV center of mass energy.... colliders based on the FCC and linear colliders (LC) are considered in detail. Parameters of upgraded versions of the FCC proton beam are determined to optimize luminosity of electron-proton collisions keeping beam-beam effects in mind. Numerical calculations are performed using a currently being developed collision point simulator. It is shown that L-ep greater than or similar to 10(33) cm(-2) s(-1) can be achieved with LHeC-like upgrade of the FCC parameters. Moreover, "dynamic focusing'' scheme could provide opportunity to handle L-ep greater than or similar to 10(33) cm(-2) s(-1). (C) 2017 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2017.07.041
Sayi :871
Sayfa :47-53
Sınıflandırma :
18
AGATA-Advanced GAmma Tracking Array
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
F A Beck , F A Beck , D Bazzacco , R Baumann , G Baulieu , D Barrientos , D L Balabanski , S Badoer , F Azaiez , S Aydin , A Austin , C Aufranc , Y Aubert , A Atac , A Astier , L Arnold , G de Angelis , F Ameil , B Alikhani , A Algora , S Akkoyun
Yıl :
2012
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realisation of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterisation of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximise its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer. (C) 2011 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2011.11.081
Sayi :668
Sayfa :26-58
Sınıflandırma :
19
A low cost X-ray imaging device based on BPW-34 Si-PIN photodiode
Araştırma Makalesi

Araştırma Makalesi
Open Access
Kaynak :
Aperta - TÜBİTAK Açık Arşivi
Dergi:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yazar(lar) :
C S Ozben , M Yucel , E Barlas Yucel , A Bayrak , E Emirhan
Yıl :
2016
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
A low cost X-ray imaging device based on BPW-34 silicon PIN photodiode was designed and produced. X-rays were produced from a CEI OX/70-P dental tube using a custom made +/- 30 kV power supply. A charge sensitive preamplifier and a shaping amplifier were built for the amplification of small signals produced by photons in the depletion layer of Si-PIN photodiode. A two dimensional position control unit was used for moving the detector in small steps to measure the intensity of X-rays absorbed in the object to be imaged. An Aessent AES220B FPGA module was used for transferring the image data to a computer via USB. Images of various samples were obtained with acceptable image quality despite of the low cost of the device. (C) 2016 Elsevier B.V. All rights reserved.
DOI : 10.1016/j.nima.2016.02.022
Sayi :819
Sayfa :1-5
Sınıflandırma :
20
Active cancellation of power supply ripple effects in continuous wave superconducting radio frequency cavities
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
Feng Qiu , Takako Miura , Toshihiro Matsumoto , Shinichiro Michizono , Hiroaki Katagiri , Dai Arakawa , Hiromitsu Nakajima
Yıl :
2020
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Digital low-level radio-frequency (LLRF) systems are used at the compact energy recovery linac (cERL) test facility to stabilize the accelerating field inside the radio frequency (RF) cavities. Proportional and integral feedback controllers are implemented in the LLRF system to suppress the various disturbances in the cavities. At cERL, the typical disturbances include microphonics detuning and high-voltage power supply (HVPS) ripples. These two types of disturbances are reflected in the sum of sinusoidal fluctuations in the RF phase. Recently, a real-time narrow-band active noise control (ANC) approach which aims to reject the microphonics detuning of less than several dozen Hz, was proved to be effective in cavity resonance control. We extend this ANC method to the LLRF field control to suppress the RF ripples caused by the HVPS. In this paper, we present our experience of applying the ANC algorithm to the LLRF system of the cERL facility at KEK. We confirmed that high frequency ripples of up to 20 kHz can be well compensated by the ANC method during the cERL beam-commissioning.
DOI : 10.1016/j.nima.2019.163280
ISSN: 0168-9002
Cilt: 955
Sayfa: 163280
Sınıflandırma :
21
Performance of preshower and shower-maximum detectors with a lead/plastic-scintillator calorimeter
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
K Kawagoe , Y Sugimoto , A Takeuchi , T Asakawa , J.P Done , Y Fujii , K Furukawa , F Kajino , T Kamon , N Kanaya , J Kanzaki , S Kim , A Nakagawa , M Nozaki , R Oishi , T Ota , H Takeda , T Takeshita , S Uozumi
Yıl :
2002
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The electron/hadron separation in the calorimetry can be improved if we measure the electromagnetic shower development at an early stage. The incident positions of electrons and photons can be precisely measured with a position sensitive detector placed near the electromagnetic shower maximum. We constructed a set of prototype preshower and shower-maximum detectors to be attached in front of a main calorimeter. Performance of the detectors was studied in combination with a lead/plastic-scintillator calorimeter module using high energy beams up to 100GeV at a test beam facility at Fermi National Accelerator Laboratory.
DOI : 10.1016/s0168-9002(01)00890-7
ISSN: 0168-9002
Sayı: 3
Cilt: 487
Sayfa: 275-290
Sınıflandırma :
22
A combined XPS, XANES and STM/STS study of gold and silver deposition on metal sulphides
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
L. Makhova , Yu. Mikhlin , A. Romanchenko
Yıl :
2007
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Synchrotron radiation X-ray photoelectron spectroscopy (SR-XPS), scanning tunneling microscopy and spectroscopy (STM/STS) have been used to characterize gold and silver species spontaneously deposited from aqueous HAuCl4 or AgNO3 solutions onto metal sulphides. An increase in Au 4f binding energies was found for unusually large, 5 nm and larger, Au0 particles; concurrently, STS revealed a positive correlation between the current magnitude and the particle size. Possible mechanisms behind the effects were considered.
DOI : 10.1016/j.nima.2007.01.029
ISSN: 0168-9002
Sayı: 1-2
Cilt: 575
Sayfa: 75-77
Sınıflandırma :
23
Development of low temperature solid state detectors for ultra-cold neutrons within superfluid 4He
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
C.A. Baker , S.N. Balashov , K. Green , M.G.D. van der Grinten , P.S. Iaydjiev , S.N. Ivanov , J.M. Pendlebury , D.B. Shiers , M.A.H. Tucker , H. Yoshiki , P. Geltenbort
Yıl :
2003
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
As part of an R&D programme for the development of a next-generation experiment to measure the neutron electric dipole moment, in which ultra-cold neutrons (UCN) are produced and stored in superfluid 4He (superthermal source), we have developed cryogenic detectors of UCN that can operate in situ within the superfluid. Surface barrier detectors and PIN diode detectors have been tested and proven to work well at temperatures as low as 80 mK. When combined with a layer of 6LiF which converts neutrons to charged particles, these detectors form a reliable UCN detection system which has been tested in liquid helium down to 430 mK. The detectors have operated within superfluid helium for periods of up to 30 days with no signs of degradation. The development of this detection system has enabled us to measure the flux of UCN from a superthermal UCN source with no intervening transmission windows which can attenuate the flux. The addition of thin films of magnetically aligned iron also enables these detectors to be used in situ for neutron spin-polarisation analysis.
DOI : 10.1016/s0168-9002(03)00384-x
ISSN: 0168-9002
Sayı: 2-3
Cilt: 501
Sayfa: 517-523
Sınıflandırma :
24
Charge collection efficiency of irradiated n+n wedge silicon microstrip detectors for ATLAS
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
S. Martı́ i Garcia , P.P. Allport , P.S.L. Booth , A. Greenall , J.N. Jackson , T.J. Jones , N.A. Smith
Yıl :
1999
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The charge collection efficiency of the n+n silicon microstrip detectors for the ATLAS forward tracking has been evaluated for detectors irradiated with 24 GeV/c protons. The charge collection efficiency is found to be 99±1% after a fluence of 2×1014 protons/cm2 and 81±2% after 4×1014 protons/cm2. Furthermore, the charge collection efficiency of the detector irradiated with the lower dose does not show any dependence on the isothermal annealing up to 52 days at 20°C, as it remains constant through the whole annealing cycle.
DOI : 10.1016/s0168-9002(98)01464-8
ISSN: 0168-9002
Sayı: 1
Cilt: 426
Sayfa: 24-27
Sınıflandırma :
25
Framework for the construction of a Monte Carlo simulated brain PET–MR image database
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
B.A. Thomas , K. Erlandsson , I. Drobnjak , S. Pedemonte , K. Vunckx , A. Bousse , A. Reilhac-Laborde , S. Ourselin , B.F. Hutton
Yıl :
2014
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Simultaneous PET–MR acquisition reduces the possibility of registration mismatch between the two modalities. This facilitates the application of techniques, either during reconstruction or post-reconstruction, that aim to improve the PET resolution by utilising structural information provided by MR. However, in order to validate such methods for brain PET–MR studies it is desirable to evaluate the performance using data where the ground truth is known. In this work, we present a framework for the production of datasets where simulations of both the PET and MR, based on real data, are generated such that reconstruction and post-reconstruction approaches can be fairly compared.
DOI : 10.1016/j.nima.2013.08.063
ISSN: 0168-9002
Cilt: 734
Sayfa: 162-165
Sınıflandırma :
26
Design of a portable directional neutron source finder
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
Hirokuni Yamanishi
Yıl :
2005
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
An instrument that determines the direction of a remote existing neutron source has been designed. This instrument combines a polyethylene block and four 3He counter tubes. The advantages of the instrument are portability and good angular resolution. The count from the detector was varied with the neutron incident angle due to the moderator. Using this characteristic, the direction of the neutron source can be measured precisely by revising the axis of the instrument so that the difference between the four detectors measurements is minimized. Consequently, the direction of the central axis of the instrument in which the response difference of the four detectors reaches a minimum indicates the direction of the neutron source. The practical use of the instrument was demonstrated by 252Cf source irradiation experiment and MCNP simulation.
DOI : 10.1016/j.nima.2004.12.033
ISSN: 0168-9002
Sayı: 3
Cilt: 544
Sayfa: 643-648
Sınıflandırma :
Enerji %75
Enerji %99
27
Highly efficient charged particle veto detector CUP
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
M. Palacz , J. Nyberg , P. Bednarczyk , J. Dworski , M. Górska , J. Iwanicki , M. Kapusta , J. Kownacki , E. Kulczycka , K. Lagergren , M. Moszyński , L. Pieńkowski , A. Stolarz , D. Wolski , M. Ziębliński
Yıl :
2005
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A novel, highly efficient, plastic scintillator detector has been constructed. The primary application of the detector is to act as a veto device in heavy-ion-induced fusion-evaporation reactions, in which the structure of proton-rich nuclides is investigated by γ-ray spectroscopy methods. The detector rejects events in which light charged particles, like protons and α particles, are emitted in the evaporation process, facilitating selection of reaction channels associated with emission of only neutrons. The detector was used in a EUROBALL experiment, with achieved efficiencies of 80% and 63% for protons and α particles, respectively. The design of the detector, its performance and limitations are discussed.
DOI : 10.1016/j.nima.2005.04.093
ISSN: 0168-9002
Sayı: 1-2
Cilt: 550
Sayfa: 414-424
Sınıflandırma :
28
Defects in nanocrystalline Pd and submicrocrystalline Cu by EXAFS
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
Yu.A Babanov , L.A Blaginina , A.V Ryazhkin , R.R Mulyukov , A.F Sidorenko , N.V Fadyushina
Yıl :
2000
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
EXAFS spectra of nanocrystalline (nc) Pd and submicrocrystalline (smc) Cu are presented. nc-Pd samples with a grain size of 15 nm have been prepared by gas condensation technique, and submicrocrystalline Cu samples with a grain size of 100 nm have been prepared by severe plastic deformation. EXAFS measurements of powder nc-Pd samples with optimal thickness were performed using synchrotron radiation, and rolled smc-Cu by laboratory EXAFS spectrometer. As a result of mathematical treatment, atomic density distribution functions have been determined. The results obtained show that in comparison with coarse-grained crystalline standards the decrease of the first neighbor coordination numbers N is 5–6% for nc-Pd, and 3% for smc-Cu. For interpretation of the obtained results, the numerical simulation of the atomic structure with modelling to cut off the bond lengths for grain boundary and to create vacancies during sample preparation is performed.
DOI : 10.1016/s0168-9002(99)00715-9
ISSN: 0168-9002
Sayı: 1-2
Cilt: 448
Sayfa: 372-375
Sınıflandırma :
29
Monte Carlo simulations of the Neutron Wall detector system
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
Joa Ljungvall , Marcin Palacz , Johan Nyberg
Yıl :
2004
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A Monte Carlo simulation of the Neutron Wall detector system has been performed using GEANT4. Mechanisms for the detection of neutrons in an aggregate of liquid scintillator detectors have been investigated in details, with the main aim to define optimum conditions for the detection and identification of multiple neutrons. Special emphasis was put on studying the scattering of neutrons between different detectors, which is the main source of the apparent increase of the number of detected neutrons, and hinders the selection of events with more than one emitted neutron. The results of the simulations were compared to experimental data obtained at the EUROBALL spectrometer using fusion–evaporation reactions. The quality of γ-ray spectra gated by 2 neutrons was improved 40 times, in terms of the relative intensity of γ-ray lines from nuclei produced with the emission of 2 and 1 neutrons. A similar increase of the relative γ-ray intensity was achieved in case of lines associated with the emission of 3 neutrons, with respect to lines from both 2 and 1 neutron evaporation channels. The improvements were only possible with a significant reduction of the intensity of the true 3 neutron emission γ-ray lines. The influence of small amounts of γ-rays mis-interpreted as neutrons was studied. It was found that it dramatically reduces the quality of the reduction of the effects due to scattered neutrons.
DOI : 10.1016/j.nima.2004.05.032
ISSN: 0168-9002
Sayı: 3
Cilt: 528
Sayfa: 741-762
Sınıflandırma :
Enerji %86
Enerji %100
30
Status of CHESS facility and research programs: 2010
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı:
Elsevier
Yazar(lar) :
Ernest Fontes , Donald H. Bilderback , Sol M. Gruner
Yıl :
2011
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
CHESS is a hard X-ray synchrotron radiation national facility located at Cornell University and funded by the National Science Foundation. It is open to all scientists by peer-reviewed proposal and serves 500–1000 visitors each year. The CHESS scientific and technical staff develops forefront research tools and X-ray instrumentation and methods and supports 12 experimental stations delivering high intensity X-ray beams produced at 5.3 GeV and 250 mA. The facility consists of a mix of dedicated and flexible experimental stations that are easily configured for general X-ray diffraction (wide- and small-angle), spectroscopy, imaging applications, etc. Dedicated stations support high-pressure powder X-ray diffraction, pulsed-laser deposition for layer-by-layer growth of surfaces, and three dedicated stations for protein crystallography. Specialized resource groups at the laboratory include: an X-ray detector group; MacCHESS, an NIH-supported research resource for protein crystallography; the G-line division, which primarily organizes graduate students and Cornell faculty members around three X-ray stations; a high-pressure diamond-anvil cell support laboratory; and a monocapillary drawing facility for making microbeam X-ray optics. Research is also ongoing to upgrade CHESS to a first-ever 5 GeV, 100 mA Energy Recovery Linac (ERL) hard X-ray source. This source will provide ultra-high spectral-brightness and <100 fs short-pulse capability at levels well in advance of those possible with existing storage rings. It will produce diffraction-limited X-rays beams of up to 10 keV energy and be capable of providing 1 nm round beams. Prototyping for this facility is under way now to demonstrate critical DC photoelectron injector and superconducting linac technologies needed for the full-scale ERL.
DOI : 10.1016/j.nima.2010.11.160
ISSN: 0168-9002
Sayı: 1
Cilt: 649
Sayfa: 3-5
Sınıflandırma :
Enerji %27
Enerji %58

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