Application of CTOF method to detect secondly charged particle from 2 GeV electron

Abstract

Recently, a lot of high energy electron accelerators are proposed for synchrotron light source, linear collider and free electron LASER facilities. To design a shield and evaluate leakage radiation at such facilities, the energy and angular data of secondary particles from the reaction of electrons with structural materials. Until now, a group of KEK, Kyoto-Univ. and PAL have measured secondly neutron spectrum from structural materials by using electron accelerator in PAL. In the neutron measurement, the electronics with Multi-hit TDC (MHTDC LeCroy 3377) was adopted to measure TOFs of every particles emitted from the reactions by each single electron bunch. At last experiment, the measurement was extended to secondly charged particles. For the charged particle measurement, the pulse height data for every particle are indispensable to distinguish charged particles by Delta-E-E method. Therefore, new system which can measure pulse height for every particle is required instead of the MHTDC system. For this requirement, the method is developed which can take output current from detectors by using a digital storage oscilloscope (DSO). This system was named 'Current Time of Flight method' (CTOF). In this study, this system is adopted to secondly charged particle measurement from 2.04 GeV electrons.