Silicon strip detector as a real-time, fast, medium-segmented hodoscope

Abstract

We have developed a single-sided silicon strip detector with a sensitive area of 64×64 mm 2 as a real-time, fast and medium-segmented hodoscope for particle physics experiments in high beam background environment. The signal of each 2 mm wide readout strip was integrated in a hybrid preamplifier with a decay constant of 10 μs. The output was then amplified 20 times and shaped to a peaking time of ∼50 ns in a shaping amplifier. The performance was first examined on a test bench, and then with an intense π −/μ −/e − beam. The Equivalent Noise Charge (ENC, 1 σ) at the preamplifier input was ∼2000 e (9% of the signal for single minimum ionizing particle ∼22 000 e) at low beam rate, and increased by 10% (or 20%) at a high rate of 150 kHz (300 kHz) per readout-strip. As the cable length ( L) from silicon board to preamplifier increased, the ENC increased from 2000 e for L=0.2 m to 2600 e for 0.5 m, 3500 e for 1 m, 3800 e for 1.5 m, and 4200 e for 2 m.