Author/Authors :
Hara، نويسنده , , K. and Hata، نويسنده , , K. and Kikuchi، نويسنده , , T. and Kim، نويسنده , , S. and Kondo، نويسنده , , K. and Miyashita، نويسنده , , S. and Nakano، نويسنده , , I. and Okutomi، نويسنده , , H. and Sano، نويسنده , , M. and Seiya، نويسنده , , Y. and Takashima، نويسنده , , S. and Takikawa، نويسنده , , K. and Tanaka، نويسنده , , M.، نويسنده ,
Abstract :
We are investigating the application of avalanche photodiodes (APDs) for readout of the signals of a scintillating fiber tracker for the CDF experiment at Fermilab. The unit of the tracking device is a 3HF fiber doublet which consists of layers of 0.5 mm diameter fibers stacked with stagger by half a fiber diameter. Each APD array has 16 pixels of 1 mm diameter arranged in line. We tested the performance of the APD array using a conventional charge amplifier and shaping amplifier. In order to optimize the SN ratio, we measured the signal and the noise as a function of the temperature and of the bias voltage. In the temperature range from −55 to +20°C, the SN ratio was measured to increase with lowering the temperature. At temperatures below −20°C, a SN ratio of better than 10 is achievable for ∼50 photons expected from the 3HF fiber doublet.
