Development of a novel segmented anode Frisch-grid ionisation chamber for fission measurements
Development of a novel segmented anode Frisch-grid ionisation chamber for fission measurements
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DOI：
10.1016/j.nima.2019.162846
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发表时间：
2020-01
影响因子：
1.4
通讯作者：
S. Bennett;P. MacGregor;A. Smith;R. L. Kennedy-Reid;T. Wright
中科院分区：
文献类型：
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作者：
S. Bennett;P. MacGregor;A. Smith;R. L. Kennedy-Reid;T. Wright
本文提出了一种在双弗里施栅电离室中测量裂变碎片发射角的新方法，该方法与测量的碎片能量无关。发射轴测量仅取决于来自三重径向分段阳极的电荷积分信号的相对定时、检测器的几何形状和释放电子的漂移速度。能量独立性意味着不需要对弗里希网格低效率和前置放大器的增益匹配进行校正。利用各向同性~（252）Cf（sf）源对该方法进行了验证，并将实验数据与探测器角效率的蒙特-卡罗计算结果进行了比较。协议之间的模拟和测量效率。该方法也已被比较的一个既定的极角测量方法，再次发现协议。
A new method is presented to measure the emission angle of fission fragments in a double Frisch-grid ionisation chamber which is independent of the measured fragment energy. The emission axis measurement is dependent only on the relative timing of the charge-integrated signals from a triply radially-segmented anode, the geometry of the detector and the drift velocity of liberated electrons. The energy independence means that corrections for Frisch-grid inefficiency and gain matching of pre-amplifiers are not required. An isotropic252Cf(sf) source has been used to test this method by comparing experimental data to a Monte-Carlo calculation of the angular efficiency of the detector. Agreement is found between the simulated and measured efficiencies. The method has also been compared to one of the established polar-angle measurement methods, where agreement is once again found.