空间带电粒子谱仪性能测试及能量刻度  

Research on the performance and the experimental energy calibration of charged particle spectrometer-identificator

作　　者：郁刚[1] 李晓强[1] 沙建军[1] 郁金南[1] 张伟国[1] 向宏文[2] 吴中祥[2] 蔡震波[2] 朱文明[2] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]中国航天科技集团公司501部,北京100086

出　　处：《核科学与工程》2004年第1期12-19,共8页Nuclear Science and Engineering

摘　　要：采用金硅面垒探测器及CsI(Tl)探测器设计制作了一套△E-E型探测空间粒子的望远镜系统,利用α粒子、质子、氧离子、铁离子4种粒子对该望远镜系统和电子学系统进行性能测试和能量刻度。电子学的增益系统分为三挡,分别为1.0、1/3和1/12.75。实验结果表明:对于α粒子,采用1/3挡,在△E_1和△E_2探测器中每道能量分别是H_1=0.107 MeV和H_2=0.123 MeV。对质子能量的刻度,采用1挡,每道能量H值为0.016 7 MeV,这个H值几乎不随能量变化,在CsI探测器中,每道能量H为1.047 MeV。对氧离子的能量刻度采用1/12.75的挡别,刻度出每道能量是1.11 MeV。在探测器中,沉积能量高于50 MeV,电子学系统进入饱和状态。对铁离子的标定结果与氧离子的结果相同。A series of semiconductor Au-Si surface barrier detectors with different thickness, scin- tillation CsI(Tl) and a modified fast response electronics system were adopted to design a multi- functional charged particle spectrometer-identificator for near-earth space environment studying. The enhancements of electronics system are divided into 3 parts: 1. 0, 1/3 and 1/12.75. The per- formance testing and energy calibration of the instrument were completed in HI-13 tandem accel- erator of China Institute of Atomic Energy. The experimental results show that the resolution of thin detector ΔE_1 is higher than that of other thick detectors for α-particles and protons detecting. Energy calibrations of α-particles in detector ΔE_1, and ΔE_2, are 0. 107 MeV and 0. 123 MeV per channel, respectively. The energy calibration of proton in detector ΔE_2, is 0. 016 7 MeV per channel, the calibrating value is more accuracy and almost constant with the injected energy of proton. But in ΔE_1 detector, the value of energy per channel is smaller than that in ΔE_2 due to the non-uniformity in thickness and disturbing from other irradiation of ray and secondary parti- cles. The scintillation CsI was also calibrated with protons of 15, 20, 23 MeV, the average ener- gy calibration is 1. 047 MeV per channel. The energy calibration is around 1 MeV per channel for oxygen ion and iron ions, but the amplifying amplitude for the electronics system will reach satu- ration when the energy deposition in every detector higher than 50 MeV. This drawback is only limited to the low and medium energy heavy ions, in the case of heavy ions with high energy the saturation phenomenon will disappear.

关 键 词：空间带电粒子谱仪 性能测试 能量刻度 △E-E型望远镜系统 沉积能量 

分 类 号：TL817.6[核科学技术—核技术及应用]