Angular response of 'pin-hole' imaging structure measured by collimated beta source
Angular response of 'pin-hole' imaging structure measured by collimated beta source
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通过准直 β 源测量“针孔”成像结构的角度响应
DOI：
10.1007/s11431-013-5376-1
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Zou JiQing
中科院分区：
文献类型：
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作者：
Zou Hong;Luo Lin;Li ChenFang;Jia XiangHong;Xu Feng;Chen HongFei;Chen Jiang;Shi WeiHong;Yu XiangQian;Zou JiQing
高能粒子的俯仰角分布对于空间物理中磁暴和粒子加速的研究具有重要意义。利用“针孔”技术和位置敏感探测器建立了一种“针孔”成像结构，可用于测量高能粒子的俯仰角分布。为了校准针孔成像结构的角响应，需要特殊的实验设备，如特殊设计的粒子加速器。这种粒子加速器的特点是：（1）出射粒子的能量范围应是中能粒子（几十keV到几百keV）;（2）粒子通量应在时间尺度上一致;（3）出射粒子的方向应一致;（4）光斑内的粒子数应足够少。本文介绍了一种用90 Sr/90 Y β源校准针孔成像结构角响应的方法，并用Geant 4软件进行了模拟。用准直β源标定的结果与Geant 4模拟结果雅阁，验证了该方法的有效性。
The pitch-angle distribution of energetic particles is important for space physics studies on magnetic storm and particle acceleration. A ‘pin-hole’ imaging structure is built with the ‘pin-hole’ technique and a position sensitive detector, which can be used to measure the pitch angle distribution of energetic particles. To calibrate the angular response of the ‘pin-hole’ imaging structure, special experiment facilities are needed, such as the particle accelerator with special design. The features of this kind of particle accelerator are: 1) The energy range of the outgoing particles should be mid-energy particles (tens keV to several hundred keV); 2) the particle flux should be consistent in time-scale; 3) the directions of the outgoing particles should be the same and 4) the particle number within the spot should be low enough. In this paper, a method to calibrate the angular response of the ‘pin-hole’ imaging structure by the90Sr/90Yβsource with a collimator is introduced and simulated by Geant4 software. The result of the calibration with the collimatedβsource is in accord with the Geant4 simulations, which verifies the validity of this method.