Development of Parallel Plate Avalanche Counter for heavy ion collision in radioactive ion beam
Development of Parallel Plate Avalanche Counter for heavy ion collision in radioactive ion beam
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DOI：
10.1016/j.net.2019.08.020
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发表时间：
2020-03
影响因子：
2.7
通讯作者：
Xianglun Wei;F. Guan;Herun Yang;Y. Wang;Z. Junwei;P. Ma;Xin-Yue Diao;Chen-Gui Lu;M. Li;Y. Guan;L. Duan;R. Hu;Xiu-ling Zhang;Z. Xiao
中科院分区：
文献类型：
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作者：
Xianglun Wei;F. Guan;Herun Yang;Y. Wang;Z. Junwei;P. Ma;Xin-Yue Diao;Chen-Gui Lu;M. Li;Y. Guan;L. Duan;R. Hu;Xiu-ling Zhang;Z. Xiao
我们研制了一台位置灵敏的平行板雪崩计数器（PPAC），用于重离子碰撞研究核物态方程（nEOS）实验中的裂变碎片探测和裂变反应面重建。该实验对PPAC的时间分辨率、效率和位置分辨率等性能提出了很高的要求。根据这些要求，我们设计了工作在低气压下的240 mm × 280 mm的PPAC。结果表明，时间分辨率可达300 ps。位置分辨率与理论计算一致，约为1.35 mm。在不同气压下，随着电压的增加，探测效率逐渐接近100%。PPAC的性能也在束流实验中得到了验证。每组阳极丝在位置谱中可以准确分离。在束流实验中，我们还得到了裂变碎片的背靠背关联，这是表征二元衰变的直接信号之一。
We have developed a position-sensitive Parallel Plate Avalanche Counter (PPAC) to detect the fission fragments and reconstruct the fission reaction plane in the experiment of studying nuclear equation of state (nEOS) by means of heavy ion collision (HIC). This experiment put forward high requirements for the performances of PPAC, such as the time resolution, efficiency and position resolution. According to these requirements we designed the PPAC with an active area of 240 mm × 280 mm working at low gas pressure. The results show that time resolution could be less than 300 ps. Position resolution is consistent with the theoretical calculation about 1.35 mm. Detection efficiency could be approaching 100% gradually with the voltage increasing in different gas pressures. The performances of PPAC have also been verified in beam experiment. Each set of anode wires can be accurately separated in the position spectrum. In the beam experiment, we also got the back-to-back correlation of fission fragments which is one of the direct signals characterizing binary decay.