Read-out systems using Si photodiodes and front-end circuits(FEC) were studied in order to measure the energy deposit with a dynamic range from 1MIP(minimum ionization particle) to 106MIPs in a crystal scintillator bar of the total absorption calorimeter (TASC) of the CALET (CALorimetric Electron Telescope) instrument. Four types of FEC were investigated for the photodiode read out. Two of them were A225(AMP-TEK), which consisted of a hybrid charge sensitive preamplifier and a shaping amplifier, and MPX-08 (NOVA), which is a charge-integrating chip. It was confirmed that the A225 had a resolution of approximately 0.31 fC and a maximum range of approximately 2 pC. A new hybrid integrated circuit(IC) is being developed to measure the light yield of a scintillator with a dynamic range of seven orders by using two photodiodes. This FEC consists of two preamplifiers that have a different gain. The performance of a high-gain preamplifier was evaluated. The resolution is approximately 0.5 fC and the maximum range is more than 25 pC. A new application specified integrated circuit(ASIC), which has a high dynamic range of four orders, is being developed. This ASIC consists of one preamplifier circuit and two shaping circuits that have a different gain. The prototype IC was designed using the 0.5-μm BiCMOS process. The outline of read-out systems using each type of FEC and the state of the development of each system are described below.
|出版ステータス||Published - 2009 1月 1|
|イベント||31st International Cosmic Ray Conference, ICRC 2009 - Lodz, Poland|
継続期間: 2009 7月 7 → 2009 7月 15
|Conference||31st International Cosmic Ray Conference, ICRC 2009|
|Period||09/7/7 → 09/7/15|
ASJC Scopus subject areas