用于辐射复合与双电子复合实验的低能离子闪烁探测器

A Scintillator Detector for Low Energy Projectile Detection in Radiative Recombination and Dielectron Recombination Experiments

为了在CSRm的电子冷却器上进行辐射复合以及双电子复合实验,需要探测能量小于4MeV/u的离子,因此设计了新的置于超高真空环境的CsI(Tl)闪烁探测器,探测器采用的光电倍增管为R7525(Hamamatsu)。介绍了新闪烁探测器的结构,并对其进行了性能测试。测试结果表明,该探测器对高、低能离子均有良好的响应,探测器的信号十分明显。探测器的最高计数率可以达到106ions/s,并且探测器附近的真空度可达10-10Pa量级,能够满足辐射复合与双电子复合实验以及储存环对真空的要求,为今后在CSRm上进行复合实验打下了良好的基础。

A new CsI（Tl）scintillation detector readout with R7525 PMT（Hamamatsu）is designed to detect low energy（4 MeV/u）ions in radiative recombination and dielectronic recombination experiments at the main cooler storage ring in Lanzhou.The structure of the scintillator detector is described in this paper.The detector is tested with α source and ion beams,respectively.The signals from background,200 MeV/u C6＋ and alpha radioactive source are recorded and analyzed.The results show that the detector has good response to high-and low-energy ions.The maximum counting rate of the detector can reach 106 ions/s and the vacuum level near the detector can reach 10-10 Pa,both are good for recombination experiments.The installation of the new detector to CSRm is of great help for future radiative recombination and dielectronic recombination experiments.