- Conference date: 27 September–2 October 2009
- Location: Melbourne (Australia)
We introduce a counting system of up to 500 MHz for synchrotron x‐ray high‐rate measurements. A silicon avalanche photodiode detector was used in the counting system. The fast‐pulse circuit of the amplifier was designed with hybrid ICs to prepare an ASIC system for a large‐scale pixel array detector in near future. The fast amplifier consists of two cascading emitter‐followers using 10‐GHz band transistors. A count‐rate of was then achieved using the system for 8‐keV x‐rays. However, a baseline shift by adopting AC‐coupling in the amplifier disturbed us to observe the maximum count of determined by electron‐bunch filling into a ring accelerator. We also report that an amplifier with a baseline restorer was tested in order to keep the baseline level to be 0 V even at high input rates.
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