A new fast neutron spectrometer named n-TPC has been designed by LPRI（Key Laboratory of Particle＆ Radiation Imaging, Ministry of Education） at Tsinghua University. The neutron energy spectrum can be calculated from...A new fast neutron spectrometer named n-TPC has been designed by LPRI（Key Laboratory of Particle＆ Radiation Imaging, Ministry of Education） at Tsinghua University. The neutron energy spectrum can be calculated from the recoil angle and energy of the recoil proton detected by a 704-pad GEM-TPC. In beam tests at IHIP（Institute of Heavy Ion Physics, Peking University） in 2014, n-TPC performed better than 6%@6 Me V energy resolution and5‰ detection efficiency. To find the best working parameters（the component and proportion of the gas, the high voltage between each GEM layer, etc.） of the n-TPC and support its application in various conditions, a multichannel distributed DAQ has been designed to read out the signals from the 704 channels. With over 25 Ms/s sampling rate and 12 bit resolution for each channel, it can record the time and amplitude information as well as traditional DAQs in the TPC application domain. The main design objective of this distributed DAQ, however, is more flexible parameter modulation and operation. It can support the n-TPC without the limitation of the chassis and categorize signals arriving from the 704 channels at the same time by different events without event triggers.展开更多
基金Supported by National Natural Science Foundation of China(11275109)
文摘A new fast neutron spectrometer named n-TPC has been designed by LPRI（Key Laboratory of Particle＆ Radiation Imaging, Ministry of Education） at Tsinghua University. The neutron energy spectrum can be calculated from the recoil angle and energy of the recoil proton detected by a 704-pad GEM-TPC. In beam tests at IHIP（Institute of Heavy Ion Physics, Peking University） in 2014, n-TPC performed better than 6%@6 Me V energy resolution and5‰ detection efficiency. To find the best working parameters（the component and proportion of the gas, the high voltage between each GEM layer, etc.） of the n-TPC and support its application in various conditions, a multichannel distributed DAQ has been designed to read out the signals from the 704 channels. With over 25 Ms/s sampling rate and 12 bit resolution for each channel, it can record the time and amplitude information as well as traditional DAQs in the TPC application domain. The main design objective of this distributed DAQ, however, is more flexible parameter modulation and operation. It can support the n-TPC without the limitation of the chassis and categorize signals arriving from the 704 channels at the same time by different events without event triggers.
