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RISS 인기검색어
- 검색키워드
- 저자 : Viacheslav Kuznetsov (검색결과 2 건)
- 무료
- 기관 내 무료
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Time-of-Flight System for a CTOF Prototype Counter with Fine-Mesh and Standard Photomultipliers
Viacheslav Kuznetsov,Sergey Chebotarev,Hoseog Dho,Jonghyuk Jang,Andrey Kim,김우영,Evgeniy Milman,니안드레이 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.3
The upgrade of Continuous Electron Beam Accelerator Facility (CEBAF) is undergo since 2010. The updated CEBAF Large Acceptance Spectrometer (CLAS12) detector is being developed for the JLab upgrade program up to 12 GeV. One of the important component of CLAS12 will be the central time-of-flight system (CTOF). The CTOF will provide detection and identification of charged particles emitted at central angles from 40 to 130. The design goal is to achieve a time-offlight resolution TOF = 50 ps. This study evaluated the timing properties of the CTOF prototype counter. The performance of the upgraded prototype 3 × 3.2 × 66 cm3 scintillation bar of BC-408,coupled to fine-mesh R5924-70 and R7761-70 Hamamatsu photomultipliers via acrylic light guides,has been measured by using two different methods: cosmic rays at Kyungpook National University (KNU), and proton beams at the MC-50 cyclotron of the Korea Institute of Radiological & Medical Sciences (KIRAMS). The gain and the timing resolution of fine-mesh PMs were compared with a conventional Hamamatsu R2083 PM. In the cosmic-ray test, the TOF resolutions were measured to be FM.PM = 79 ± 0.75stat ± 4syst ps and R2083 = 73 ± 1.3stat ± 4syst ps for fine-mesh and ordinary photomultipliers, respectively. With proton beams, these values were FM.PM = 39.1 ±0.55 ps and R2083 = 35.0 ± 0.54 ps at count rate 0.15 MHz. These remained constant at higher count rates up to 1.5 MHz. The average ratio of the fine-mesh to the ordinary PM resolutions was 1.123 ± 0.02. The upgrade of Continuous Electron Beam Accelerator Facility (CEBAF) is undergo since 2010. The updated CEBAF Large Acceptance Spectrometer (CLAS12) detector is being developed for the JLab upgrade program up to 12 GeV. One of the important component of CLAS12 will be the central time-of-flight system (CTOF). The CTOF will provide detection and identification of charged particles emitted at central angles from 40 to 130. The design goal is to achieve a time-offlight resolution TOF = 50 ps. This study evaluated the timing properties of the CTOF prototype counter. The performance of the upgraded prototype 3 × 3.2 × 66 cm3 scintillation bar of BC-408,coupled to fine-mesh R5924-70 and R7761-70 Hamamatsu photomultipliers via acrylic light guides,has been measured by using two different methods: cosmic rays at Kyungpook National University (KNU), and proton beams at the MC-50 cyclotron of the Korea Institute of Radiological & Medical Sciences (KIRAMS). The gain and the timing resolution of fine-mesh PMs were compared with a conventional Hamamatsu R2083 PM. In the cosmic-ray test, the TOF resolutions were measured to be FM.PM = 79 ± 0.75stat ± 4syst ps and R2083 = 73 ± 1.3stat ± 4syst ps for fine-mesh and ordinary photomultipliers, respectively. With proton beams, these values were FM.PM = 39.1 ±0.55 ps and R2083 = 35.0 ± 0.54 ps at count rate 0.15 MHz. These remained constant at higher count rates up to 1.5 MHz. The average ratio of the fine-mesh to the ordinary PM resolutions was 1.123 ± 0.02.
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Viacheslav Kuznetsov,Jooyoung Jang,Andrey Kim,김우영,이상훈,니안드레이,Yuseok Kim,Minyoung Lee,Taekeun Yang 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
The first measurement of the time-of-flight (TOF) resolution of a Bicron-408 scintillation counter equipped with magnetic-resistant fine-mesh Hamamatsu R7761-70 photomultipliers is presented. The data were obtained using the proton beam of the MC50 Cyclotron of the Korea Institute of Radiological and Medical Sciences (KIRAMS). The TOF resolution for ~45-MeV protons is 18.2 ps. Its dependence on the light output L is well fitted by 41.6ps/L/LMIP , where LMIP denotes the light output produced by relativistic minimum-ionizing muons which deposit ΔE ~ 6 MeV in the detector volume. The first measurement of the time-of-flight (TOF) resolution of a Bicron-408 scintillation counter equipped with magnetic-resistant fine-mesh Hamamatsu R7761-70 photomultipliers is presented. The data were obtained using the proton beam of the MC50 Cyclotron of the Korea Institute of Radiological and Medical Sciences (KIRAMS). The TOF resolution for ~45-MeV protons is 18.2 ps. Its dependence on the light output L is well fitted by 41.6ps/L/LMIP , where LMIP denotes the light output produced by relativistic minimum-ionizing muons which deposit ΔE ~ 6 MeV in the detector volume.
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