| The PIN silicon photodiode made by ALICE-China Group,which has a large area and high performances,is an important part of the Photon Spectrometer (PROS) PbWO4 detector Read-Out system on the ALICE experiment.The PIN diode has a sensitive area of 16x17 mm2. Its leakage current is lower than 5nA at room temperature. The quantum efficiency in the wavelength range of 400-500nm is about 83%. The junction capacity is about 110-120pF. The noise level (ENC) of PIN+PreAmp system is lower than 527e at -25C. The PIN diodes have passed the long-term stability test. All the main performances of our PIN diodes meet the requirement of ALICE/PHOS,and some of them are even better.The beam-test of China PIN diodes at the CERN SPS accelerator produced satisfactory results. In addition,we studied the PIN punch-through effect,and obtained the PIN punch-through data with 18cm long Pb WO4 crystal at the electron beam energies higher than 20GeV for the first time,and these data gave valuable information to ALICE/PHOS. |
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