A Muti-channel Distributed DAQ for n-TPC
A Muti-channel Distributed DAQ for n-TPC
复制标题
DOI：
10.1088/1674-1137/39/11/116103
复制
发表时间：
2015-05
期刊：
影响因子：
--
通讯作者：
Chen Xiaolei;Liu Jianfang;Y. Qian;Niu Libo;Liang Yulan
中科院分区：
文献类型：
--
作者：
Chen Xiaolei;Liu Jianfang;Y. Qian;Niu Libo;Liang Yulan
清华大学粒子与辐射成像教育部重点实验室研制了一台新型快中子谱仪n-TPC。中子能谱可以由704-pad GEM-TPC探测到的反冲质子的反冲角和能量计算。在2014年北京大学重离子物理研究所的束流测试中，n-TPC在6 MeV的能量分辨率和0.5倍的探测效率下表现优于6倍。为了找到最佳的工作参数（气体的成分和比例、GEM各层之间的高电压等）。为了支持n-TPC在各种条件下的应用，设计了一个多通道分布式数据采集器，用于读取704个通道的信号。它具有25 Ms/s以上的采样率和12 bit的分辨率，在TPC应用领域可以像传统的DAQ一样记录时间和幅度信息。然而，这种分布式DAQ的主要设计目标是更灵活的参数调制和操作。它可以支持n-TPC而不受机箱的限制，并将来自704个通道的信号同时按不同的事件分类，而无需事件触发器。
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 percents at 6MeV energy resolution and 0.5 percents 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 design 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.