Klir D, Kravarik J, Kubes P, Rezac K, Litseva E, Tomaszewski K, Karpinski L, Paduch M, Scholz M
Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 16627 Prague 6, Czech Republic.
Rev Sci Instrum. 2011 Mar;82(3):033505. doi: 10.1063/1.3559548.
We have developed and tested sensitive neutron detectors for neutron time-of-flight measurements in z-pinch and plasma focus experiments with neutron emission times in tens of nanoseconds and with neutron yields between 10(6) and 10(12) per one shot. The neutron detectors are composed of a BC-408 fast plastic scintillator and Hamamatsu H1949-51 photomultiplier tube (PMT). During the calibration procedure, a PMT delay was determined for various operating voltages. The temporal resolution of the neutron detector was measured for the most commonly used PMT voltage of 1.4 kV. At the PF-1000 plasma focus, a novel method of the acquisition of a pulse height distribution has been used. This pulse height analysis enabled to determine the single neutron sensitivity for various neutron energies and to calibrate the neutron detector for absolute neutron yields at about 2.45 MeV.
我们已经开发并测试了用于z箍缩和等离子体聚焦实验中中子飞行时间测量的灵敏中子探测器，这些实验中的中子发射时间为几十纳秒，每次发射的中子产额在10⁶到10¹²之间。中子探测器由一个BC - 408快速塑料闪烁体和滨松H1949 - 51光电倍增管（PMT）组成。在校准过程中，针对不同的工作电压确定了PMT延迟。在最常用的1.4 kV PMT电压下测量了中子探测器的时间分辨率。在PF - 1000等离子体聚焦装置中，采用了一种获取脉冲高度分布的新方法。这种脉冲高度分析能够确定各种中子能量下的单中子灵敏度，并校准中子探测器以测量约2.45 MeV处的绝对中子产额。
