Monte Carlo simulation of proton response in Timepix detectors
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摘要: 在激光驱动惯性约束聚变实验研究中，质子能谱诊断常用的记录介质CR-39固体径迹探测器在能谱测量方面存在时效性与一致性的缺陷，而具有在线信号获取能力的Timepix探测器能够克服这些问题。为将Timepix探测器应用于内爆质子能谱探测，研究Timepix探测器对质子能量和入射角度的响应十分有必要。在Allpix2框架内，使用蒙特卡罗方法分析了Timepix探测器对不同能量和入射角度质子束的响应。模拟结果显示，以质子能否穿透传感器灵敏区域为区分，Timepix探测器对质子束入射角度与能量的响应规律在簇形态、簇尺寸分布以及簇电荷分布上具有显著差异。当入射质子束能量低于6 MeV时，Timepix探测器探测效率高，且质子入射角度不会对探测器能量响应产生显著影响。Abstract: In laser-driven inertial confinement fusion experiments, the CR-39 detector, a commonly - used recording medium for proton energy spectrum diagnosis, has timeliness and consistency flaws in energy spectrum measurement. However, the Timepix detector with the ability to obtain online signals can overcome these problems. To apply the Timepix detector to detect implosion proton energy spectra, it is essential to study the response of the Timepix detector to proton energies and incident angles. This work analyzes the response of the Timepix detector to proton beams in different energies and incident angles within the Allpix2 framework using Monte Carlo methods. The simulation results show that the response of the Timepix detector to proton beams in different energies and incident angles exhibits significant differences in cluster morphology, cluster size distribution, and cluster charge distribution. When incident proton beam energy is below 6 MeV, the Timepix detector exhibits high detection efficiency, and the angle of proton incidence does not significantly affect the energy response of the detector.
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Key words:
- laser fusion /
- monte carlo simulation /
- detector /
- proton spectrum /
- Pixelated cluster
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图 4 不同能量质子束垂直入射产生的像素化簇
Figure 4. Pixelated cluster produced by proton beams in vertical incidence with different energy
图 5 在不同能量范围的质子束产生的簇电荷分布
Figure 5. The charge cluster distribution produced by proton beams in different energy ranges
图 6 簇电荷随能量的变化分布，选取半高宽为误差棒
Figure 6. The energy distribution of cluster charge, with the full width at half maximum (FWHM) selected as the error bars
图 7 簇电荷与簇尺寸随角度的变化分布
Figure 7. The angular distribution of cluster charge and cluster size
表 1 模拟参数
Table 1. Parameters of simulation
group detector type particle type θ/(deg) θ step/(deg) energy of proton/(MeV) energy step of proton/(MeV) energy timepix proton 0 / 1-8 1 0 10-16 2 0 6.1-6.5 0.1 0 6.15 / angle timepix proton 0-75 15 5.5 / 14.7 
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