新型粒子鉴别探测器技术的研究

Recently, nuclear physics experiments carried out on RIBLL have higher demand for improving the capability of particle identification. To improve the resolution, we need to upgrade the measurement facilities such as ΔE-E-TOF detectors. LaBr3 and LFS-3 scintillators have lots of advantages, such as strong blocking ability, high light output, high energy resolution and fast response time，which can be used for the investigation for the time and energy detectors. Because of those advantages,LaBr3 and LFS-3 scintillators can be used to improve the performance of time and energy detectors. LFS-3 also has very good resistant for radiation. It’s very important for high beam energies and luminosities of RIBLL accelerator systems. SiPM has lots of advantages like anti-magnetic, high quantum efficiency, fast response time, low operating voltage, low cost, compact and high position resolution. Those benefits make SiPM having very good performance for time energy and two-dimensional position measurement. Thus, we are ready to develop TOF detector consists of LFS-3 and SiPM to improve the time performance, develop ΔE detector with LFS-3 and SiPM to improve the ability to measure particle energy loss, develop energy & position detectors with LaBr3 and SiPM to improve the performance of the energy deposition measurement and the two-dimensional position spectrum measurement , thereby we can improve the particle identification capabilities.

近年来，在RIBLL上开展的核物理实验对粒子鉴别质量的要求越来越高，迫切需要提高ΔE-E-TOF的测量精度，需要研制高性能的探测器。LaBr3和LFS-3具有阻止能力强，高光输出，高能量分辨和快时间响应等优点，适用于时间和能量探测器的研制。SiPM具有抗磁场，量子效率高，快时间响应，工作电压低，成本低，结构紧凑和高位置分辨的优点，可以用于时间、能量以及二维位置信息的测量。而且LFS-3具有很好的抗辐射能力，适用于RIBLL上的高能量和强度的束流测量。由此，我们拟研制基于LFS+SiPM的TOF探测器加强时间性能，研制基于LFS+SiPM的ΔE探测器以及基于LaBr3+SiPM的总能量和位置探测器，提高对粒子能损和沉积能量的测量精度以及加强对粒子碰撞位置等相关信息的的测量，从而提高实验中粒子的鉴别能力。

近年来，在RIBLL上开展的核物理实验对粒子鉴别质量的要求越来越高，迫切需要提高ΔE-E-TOF的测量精度，需要研制高性能的探测器。LaBr3和LFS-3具有阻止能力强，高光输出，高能量分辨和快时间响应的优点，适用于时间和能量探测器的研制。SiPM具有抗磁场，量子效率高，快时间响应，工作电压低，成本低，结构紧凑和高位置分辨的优点，可以用于时间、能量以及二维位置信息的测量。而且LFS-3具有很好的抗辐射能力，适用于RIBLL上的高能量和强度的束流测量。基于上述背景，本项目研制了LFS+SiPM的ΔE探测器以及由LaBr3+SiPM构成的总能量和位置探测器，并开展了模拟计算、性能测试和在束实验的研究。同时对SiPM的相关性能进行了研究，如温度、电压等。相关测试结果表明，本项目的开展对提高了粒子能损和沉积能量的测量精度以及加强了对粒子碰撞位置等相关信息的测量，从而有助于提高实验中粒子的鉴别能力。