A novel methodological study for monitoring proton beam spot using back-streaming secondary neutrons from the high-power target
A novel methodological study for monitoring proton beam spot using back-streaming secondary neutrons from the high-power target
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DOI：
10.1088/1748-0221/17/08/p08001
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发表时间：
2022-08
影响因子：
1.3
通讯作者：
X.Y. Yang;H. Jing;B. B. Tian-B.;L. Ou;Y.K. Sun;X.L. Gao
中科院分区：
文献类型：
--
作者：
X.Y. Yang;H. Jing;B. B. Tian-B.;L. Ou;Y.K. Sun;X.L. Gao
高功率散裂中子源的质子束功率一般在100千瓦到几兆瓦之间。光束在靶上的功率密度分布对高功率散裂靶的稳定运行至关重要。本研究提出了一种基于针孔成像原理，利用散裂靶的二次中子回流，恢复靶上高功率质子束光斑图像的束流监测方法。在距离目标几十米的距离上，可以实现对光束光斑的快速和间接成像。所提出的束流监测方法可以在远离高辐射目标区的情况下，根据探测系统的需要，灵活调整针孔的大小和测量距离来控制二次中子的通量强度。仿真结果表明，该方法可以利用点响应函数和次级中子图像恢复入射质子的束斑。基于CSNS中的目标和Back-n波束线，通过蒙特卡罗仿真验证了该方法的有效性。
The power of the proton beam of a high-power spallation neutron source generally ranges from 100 kW to several MW. The distribution of the power density of the beam on the target is critical for the stable operation of the high-power spallation target. This study proposes a beam monitoring method that involves restoring the image of a high-power proton beam spot on a target based on the principle of pinhole imaging by using the back-streaming of secondary neutrons from the spallation target. Fast and indirect imaging of the beam spot can be achieved at a distance of tens of meters from the target. The proposed method of beam monitoring can flexibly adjust the size of the pinhole and the measurement distance to control the intensity of flux of the secondary neutrons according to the demands of the detection system, which is far from the high-radiation target area. The results of simulations showed that the proposed method can be used to restore the beam spot of the incident proton by using the point response function and images of the secondary neutrons. Based on the target and the Back-n beamline in the CSNS, the effectiveness of this method has also been confirmed by means of Monte Carlo simulation.