回流中子在CSNS靶上的准直和屏蔽研究
Study on collimation and shielding of the back-streaming neutrons at the CSNS target
摘要：
CSNS的溅射靶产生的回流中子非常强，对加速器-靶界面区的器件会造成严重的损伤问题。为了解决这一问题，研究了一种可能的方案，即为质子束线专门设计的光学系统产生两个束腰，并在两个腰部位置放置两个准直器，以最大限度地提高回流中子的准直效果。详细的蒙特卡罗模拟结果表明，准直系统的有效性，并在界面部分的辐射剂量率大大降低。这可以确保用于束流传输线中的最后磁体和其他装置的环氧树脂线圈具有合理的寿命，例如三十年。这种加速器-靶界面区域的设计原理也可以应用于其他高功率质子束应用。
英文摘要：
The back-streaming neutrons from the spallation target at CSNS are very intense, and can pose serious damage problems for the devices in the accelerator-target interface region. To tackle the problems, a possible scheme for this region was studied, namely a specially designed optics for the proton beam line produces two beam waists, and two collimators are placed at the two waist positions to maximize the collimation effect of the back-streaming neutrons. Detailed Monte Carlo simulations with the beams in the two different CSNS phases show the effectiveness of the collimation system, and the radiation dose rate decreases largely in the interface section. This can ensure the use of epoxy coils for the last magnets and other devices in the beam transport line with reasonable lifetimes, e.g. thirty years. The design philosophy for such an accelerator-target interface region can also be applicable to other high-power proton beam applications.
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