Speaker
Mr
kenji hosomi
(Department of Physics, Tohoku University)
Description
For a hypernuclear gamma-ray spectroscopy experiment at the J-PARC K1.8 beam line,
a new Ge detector array (Hyperball-J) is under construction.
Hyperball-J consists of 32 Ge detectors that have a transistor-reset preamp.
The reset-type preamp is necessary to withstand the high energy deposit rate in the experiment caused by penetrations of high energy beam particles.
The maximum beam intensity of J-PARC is expected to reach to 10 MHz which is 5 times larger than that of KEK-PS.
Current readout circuit including pulse height ADC will fail from increased baseline shifts after the preamp reset and pileup events.
As a new readout method, a waveform readout system is being developed.
At the present stage, We have succeeded in reading correct energy by fitting to a digitized waveforms.
When shaping time is 2 usec, energy resolution is FWHM 3.5 keV for 1 MeV gamma ray.
The minimum separation of two pulses that can be resolved is 1 usec.
In this presentation, I will discuss an algorithm that has been developed and report on the performance of the new readout method for J-PARC experiment.
Primary author
Mr
kenji hosomi
(Department of Physics, Tohoku University)
