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Synchrotron radiation light sources produce intense beam of X-ray withultra-short pulse and nanosecond period. This of-fers the opportunities for thetime resolution experiments. Achieving higher counting rate and faster arrivingtime is diffi-cult for common detectors. But avalanche photodiodes (APD) basedon silicon which have been commercially available1 with large active areas(e.g.10mmx10mm@ Perkin-Elmer Inc.) could satisfy the demands due to their goodtime resolution, low noise and large area.We investigate the high counting rateand nanosecond time resolution detector with APD. The detector's fast amplifierwas designed with the gain of about 60dB (1000). The amplifier included withthree stages RF-preamplifier using MAR6+ chip5 for the carefully controllingthe circuit oscillation. Some measures have been taken for the preamplifiersgood performance such as using resistance net between RF-preamplifier chip andthe isolation of high voltage circuit from the preamplifier. The timeresolution of the preamplifier together with APD sensor could reach below 1nsFWHM.

Sub-nanosecond time resolution detector based on APD for Synchrotron Radiation ultrafast experiments