Online diagnosis system for D3He proton in laser fusion implosion experiments
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摘要: 提出了一种基于混合像素探测器作为记录介质的用于激光聚变内爆D3He质子源能谱和产额测量的在线磁谱仪诊断系统。通过对探测器上特征团簇数目和能量的识别，结合诊断系统排布，可以快速获取激光聚变反应产生的D3He质子源的能谱和产额。在神光装置上对该诊断系统进行了测试。实验使用31束纳秒激光聚焦到靶丸上驱动聚变反应。靶丸内充有原子比1∶1的D2和3He的混合气体。在线磁谱仪诊断系统测量到了中心能量在14.6 MeV、半高全宽为2.1 MeV、产额约(2.3±0.13)×109的初级D3He质子能谱。该系统的建立可以实时给出D3He质子源能谱和产额信息，从而更加及时地指导实验的开展。Abstract: An online magnetic spectrometer system based on a hybrid pixel detector is proposed for the diagnosis of the D3He proton spectrum and yield in laser fusion implosion experiments. By identifying the number and energy of the track clusters and considering the experiment setup, the proton spectrum and yield could be deduced in time. The online diagnosis system is tested on the SG laser facility, in which 31 laser beams are focused on the capsule to drive the fusion reaction. With D2 and 3He gas mixed 1∶1 by atomic ratio, the primary D3He proton energy spectrum with center energy of 14.6 MeV, FWHM of 2.1 MeV, and yield of 2.3×109 is obtained. This system could provide the D3He proton spectrum and yield online, which would be helpful to improve the experiment in time.
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Key words:
- laser fusion /
- implosion /
- proton spectrum /
- online diagnosis
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