TY - JOUR
T1 - Large-area scintillator hodoscope with 50 ps timing resolution onboard BESS
AU - Shikaze, Y.
AU - Orito, S.
AU - Mitsui, T.
AU - Yoshimura, K.
AU - Matsumoto, H.
AU - Matsunaga, H.
AU - Nozaki, M.
AU - Sonoda, T.
AU - Ueda, I.
AU - Yoshida, T.
N1 - Funding Information:
Sincere thanks are given to T. Sanuki for valuable help in manufacturing the high-voltage power supply, to T. Tanizaki for assistance in investigating saturation of the 13th dynode used for highly charged particles, to M. Sasaki, M. Fujikawa and T. Murata for hodoscope installation, and to other members of BESS collaboration for such tremendous efforts. This work was supported by a Grant-in-Aid for Scientific Research from the Japanese Ministry of Education, Science and Culture. The analysis was performed using the computing facilities at ICEPP, University of Tokyo.
PY - 2000/12/11
Y1 - 2000/12/11
N2 - We describe the design and performance of a large-area scintillator hodoscope onboard the BESS rigidity spectrometer; an instrument with an acceptance of 0.3 m2 sr. The hodoscope is configured such that 10 and 12 counters are, respectively, situated in upper and lower layers. Each counter is viewed from its ends by 2.5 in. fine-mesh photomultiplier tubes placed in a stray magnetic field of 0.2 T. Various beam-test data are presented. Use of cosmic-ray muons at ground-level confirmed 50 ps timing resolution for each layer, giving an overall time-of-flight resolution of 70 ps rms using a pure Gaussian-resolution function. Comparison with previous measurements on a similar scintillator hodoscope indicates good agreement with the scaling law that timing resolution is proportional to 1/√Npc, where Npc is the effective number of photoelectrons.
AB - We describe the design and performance of a large-area scintillator hodoscope onboard the BESS rigidity spectrometer; an instrument with an acceptance of 0.3 m2 sr. The hodoscope is configured such that 10 and 12 counters are, respectively, situated in upper and lower layers. Each counter is viewed from its ends by 2.5 in. fine-mesh photomultiplier tubes placed in a stray magnetic field of 0.2 T. Various beam-test data are presented. Use of cosmic-ray muons at ground-level confirmed 50 ps timing resolution for each layer, giving an overall time-of-flight resolution of 70 ps rms using a pure Gaussian-resolution function. Comparison with previous measurements on a similar scintillator hodoscope indicates good agreement with the scaling law that timing resolution is proportional to 1/√Npc, where Npc is the effective number of photoelectrons.
UR - http://www.scopus.com/inward/record.url?scp=0034515237&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034515237&partnerID=8YFLogxK
U2 - 10.1016/S0168-9002(00)00571-4
DO - 10.1016/S0168-9002(00)00571-4
M3 - Article
AN - SCOPUS:0034515237
SN - 0168-9002
VL - 455
SP - 596
EP - 606
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 3
ER -