基于束流环形高斯模型对上海硬X射线自由电子激光装置的束流刮束器进行活化分析

辐射防护 ›› 2021, Vol. 41 ›› Issue (2): 124-128.

基于束流环形高斯模型对上海硬X射线自由电子激光装置的束流刮束器进行活化分析

徐玉海¹, 王光宏¹, 陈思¹, 李哲夫¹, 谷端¹, 王孝娃^2,3

1.中国科学院上海高等研究院,上海 201204;
2.上海质子重离子医院,上海 201321;
3.上海质子重离子放射治疗工程技术研究中心,上海 201321

收稿日期:2020-07-29 出版日期:2021-03-20 发布日期:2021-05-07
通讯作者: 王孝娃。E-mail: xiaowa.wang@sphic.org.cn
作者简介:徐玉海(1985—),男,2008年本科毕业于泰山学院物理学专业,2012年硕士毕业于哈尔滨工程大学核技术及应用专业, E-mail: xuyuhai@zjlab.org.cn
基金资助:
上海市科技重大专项课题《硬X射线自由电子激光关键技术研究及集成测试》(批准号2017SHZDZX02)资助。

Analysis of radiation protection for beam collimator at SHINE facility

XU Yuhai¹, WANG Guanghong¹, CHEN Si¹, LI Zhefu¹, GU Duan¹, WANG Xiaowa^2,3

1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204;
2. Shanghai Proton and Heavy Ion Center,Shanghai 201321;
3. Shanghai Enginneering Research center of Proton and Heavy Ion Radiation Theraoy,Shanghai 201321

Received:2020-07-29 Online:2021-03-20 Published:2021-05-07

摘要/Abstract

摘要： 在建的上海硬X射线自由电子激光装置(Shanghai HIgh repetition rate XFEL aNd Extreme light facility,SHINE)的加速器隧道内,采用束流刮束器刮掉束晕外围张角比较大的电子,刮束器的束流损失率为0.1‰。本文采用蒙特卡洛程序FLUKA,用SOURCE程序实现电子束在3σ_beam外的高斯分布,以尽量真实模拟电子在束流刮束器处的丢失情况,解决了低功率刮束情况下蒙特卡洛模拟无统计性结果的难题。利用束流环形高斯模型对刮束器的活化进行了分析,结果表明环形高斯模型可以更真实地再现电子在束流刮束器的丢失情况;5年运行后距刮束器30 cm处的剩余剂量率达到了数百μSv/h至数mSv/h,和国外类似装置计算结果相当;通过对放射性核素的种类分析,结果证明刮束器(钨)的放射性废物处置难度不大。

关键词: 上海硬X射线自由电子激光装置, 束流刮束器, 蒙特卡洛程序, FLUKA, 束流环形高斯模型, 活化分析

Abstract: The Shanghai HIgh repetition rate XFEL aNd Extreme light facility (SHINE) under construction is located at Zhangjiang Hi-Tech Park, Shanghai. The SHINE facility consists of an 8 GeV continuous-wave (CW) superconducting linear accelerator, a 100 PW laser system, three undulator lines, and ten experimental end-stations at phase-I. The SHINE facility will be built in a tunnel 29 meters underground, with a total length of 3 km. In the tunnel of No.2 shaft, there are many beam collimators for scraping off electrons with a relatively large opening angle at the periphery of the beam halo, and the beam loss rate of the beam collimator is 1/10,000. In this paper, the Monte Carlo program FLUKA is used to simulate the Gaussian distribution of the electron beam outside 3 σ_beam with its SOURCE program. The model to simulate the loss of electrons at the beam collimator is called the beam ring-type Gaussian model. The main material of the beam collimator adopts tungsten to attenuate the strong radiation caused by the electron electromagnetic shower. The model was used to analyze the activation of the beam collimator. The results show that the Gaussian distribution model can more realistically reproduce the loss of electrons in the beam collimator. Gaussian distribution model was used to analyze the activation and the results prove that the disposal of tungsten radioactive waste is not difficult.

Key words: Shanghai hard X-ray free electron laser device, SHINE, beam collimator, Monte Carlo code, FLUKA, the beam ring-type Gaussian model, activation analysis

中图分类号:

TL77

徐玉海, 王光宏, 陈思, 李哲夫, 谷端, 王孝娃. 基于束流环形高斯模型对上海硬X射线自由电子激光装置的束流刮束器进行活化分析[J]. 辐射防护, 2021, 41(2): 124-128.

XU Yuhai, WANG Guanghong, CHEN Si, LI Zhefu, GU Duan, WANG Xiaowa. Analysis of radiation protection for beam collimator at SHINE facility[J]. RADIATION PROTECTION, 2021, 41(2): 124-128.