Waveform sampler module for J-PARC TREK experiment

A waveform sampler module has been developed for stopped kaon experiments at J-PARC. It will be applied to CsI(TI) signal readout and to drift chamber charge readout for an active muon polarimeter. The signal of the CsI(TI) photon detector has one μsec time constant, and the signal width of the active polarimeter is a few hundred nsec. The requirements for the read-out module from the experiments are high speed charge and time measurements. The readout devices should work well with a 10 kHz trigger rate. A pile-up analysis is also required for the CsI(TI) photon detector. We have adopted the wave sampling method using a flash ADC to fulfill these requirements and we have developed a new flash ADC module for this purpose. The features of this modules are, 10 bit full range, 100 MHz sampling frequency, 32 input channels, 6U VME form-factor, FPGA network engine based on a 100 Mbps network interface and event synchronization signal interface.