Study of Scintillator Readout with Silicon Photomultipliers

2004 Fiscal Year Final Research Report Summary

• Project/Area Number: 15540285
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku Gakuin University
• Principal Investigator: YOSHIMOTO Hoshi Tohoku Gakuin University, Faculty of Engineering, Professsor, 工学部, 教授 (80146117)
• Co-Investigator(Kenkyū-buntansha): KAZUSHI Neichi Tohoku Gakuin University, Faculty of Economics, Professsor, 経済学部, 助教授 (90296012)
• Project Period (FY): 2003 – 2004
• Keywords: Multianode Photomultiplier / Scintillation light / Wave shifting fiber / Avalanche Photodiode

Research Abstract

We report on the performance of scintillating fiber and silicon multianode photomultiplier for the scintillator readout. The study of the fiber made involved fiber bending in a 1.5 m long (Kuraray multiclad fiber), 1 mm diameter fiber. Light loss was measured by injecting light into one end of the fiber and measuring the output light before and after controlled bending of the fiber. We have measured three kind of the light loss measurement. First, light loss was measured as a function of radius(r) for single-turn loop of the fiber: r = 2.8, 3.2, 4.0, 4.9, 6.25 cm 〜3%, 8.2 cm < 3%. Second, light loss was measured by single-turn loop in a 4 cm diameter as a function of loop position: 5 cm from emission diode 〜5 %, center and 5 cm from photodiode 〜3.5 %.Third, light loss was measured by multi-turn loop as a function of number of turns: r = 4.0, 6.25 cm 〜3%, 2.8 cm 〜30% for four-turn loops. Also, we measured the performance of Hamamatus Multianode Photomultiplier H6568-10(4x4) using the light emission photodiode and the scintillating fiber. The relative anode sensitivity was obtained by measuring the variation of the anode current as a function of the applied voltage. The average variation of relative anode was less than 10%, the leakage current between anodes was less than 5%. Also, the linearity of the photomultiplier was tested by using a laser beam controlled by ND filter. For -800V, corresponding to an amplification of 〜5x10^4, the average value of the linearity variation was equal to 5 %.
Now, we are going to summarize our data to published NIM