CSNS带宽限制中子斩波器系统的设计方法

蔡伟亮; 王平; 张清; 耿艳胜; 张文翔

doi:10.11889/j.0253-3219.2018.hjs.41.120202

您当前的位置：

首页 >

文章列表页 >

CSNS带宽限制中子斩波器系统的设计方法

低能加速器技术、射线技术及应用 | 更新时间：2021-05-19

- CSNS带宽限制中子斩波器系统的设计方法
- Design method of bandwidth limiting neutron chopper system in CSNS
- 核技术 2018年41卷第12期文章编号：120202
- 作者机构：
  
  1.中国科学院高能物理研究所北京 100049
  2.东莞中子科学中心东莞 523803
- 作者简介：
  
  [ "蔡伟亮, 男, 1986年出生, 2012年毕业于华南农业大学, 现为硕士研究生, 研究领域为中子斩波器", "CAI Weiliang, male, born in 1986, graduated from South China Agricultural University in 2012, master student, focusing on neutron chopper" ]
  王平, E-mail:wangping@ihep.ac.cn WANG Ping, E-mail:wangping@ihep.ac.cn
- 基金信息：
  
  中国科学院青年创新促进会(2016014)
- DOI：10.11889/j.0253-3219.2018.hjs.41.120202
  中图分类号： TL99
- 收稿日期：2018-08-07，
  
  修回日期：2018-10-16，
  
  纸质出版日期：2018-12-10
- 稿件说明：
移动端阅览
蔡伟亮, 王平, 张清, 等. CSNS带宽限制中子斩波器系统的设计方法[J]. 核技术, 2018,41(12):120202

Weiliang CAI, Ping WANG, Qing ZHANG, et al. Design method of bandwidth limiting neutron chopper system in CSNS[J]. Nuclear techniques, 2018, 41(12): 120202
蔡伟亮, 王平, 张清, 等. CSNS带宽限制中子斩波器系统的设计方法[J]. 核技术, 2018,41(12):120202 DOI： 10.11889/j.0253-3219.2018.hjs.41.120202.

Weiliang CAI, Ping WANG, Qing ZHANG, et al. Design method of bandwidth limiting neutron chopper system in CSNS[J]. Nuclear techniques, 2018, 41(12): 120202 DOI： 10.11889/j.0253-3219.2018.hjs.41.120202.

摘要

带宽限制中子斩波器是中国散裂中子源上飞行时间中子散射谱仪不可缺少的关键设备之一，谱仪获得的中子能谱波段范围由带宽斩波器决定，其主要原理是通过转盘的机械式阻挡来对中子束流进行斩波，选择到达样品的中子波长范围，从而起到降低背底、提高信噪比的作用。本文介绍了带宽限制中子斩波器的基本原理及其设计要求，重点阐述了带宽限制中子斩波器系统的设计方法，提出了斩波器系统配置布局的基本原则，并给出了带宽斩波器各物理参数的计算公式。带宽斩波器的配置数量应满足谱仪背底要求，去除背底的斩波器应放置在束线前端并使谱仪所需波段的中子无损失通过，带宽选取的斩波器则尽可能放置在束线后端。另外，满足同相位、同转速、同开口角和转动方向相反等条件的双盘斩波器可以在一定程度上提高中子通量。本文的工作可为中国散裂中子源二十台中子散射谱仪斩波器系统的物理设计提供指导和参考。

Abstract

Background

Bandwidth-limited neutron chopper (BWL choppers) is one of the indispensable key equipments in the time-of-flight neutron scatter of China spallation neutron source (CSNS)

which decide the neutron energy spectrum obtained by detectors. The main principle is to chop the neutron beam to limit the neutron wavelength bandwidth at the neutron detector

so as to reduce the background and improve the signal-to-noise ratio.

Purpose

This study aims to design BWL chopper system reasonably and reduce faults.

Methods

The basis principle of BWL chopper was reviewed

Design method

basis configuration principle of BWL chopper and system layout were put forward. The formulas for calculating the physical parameters of BWL chopper were given.

Results

The configuration numbers of bandwidth chopper should meet the requirement of neutron scatter. The background removing chopper should be inserted in the front end of the beam line so that the neutrons in the required band of the spectrometer could pass through without loss

while the bandwidth selecting chopper should be placed at the back end as far as possible. In addition

the flux can be increased by double disk chopper that satisfies same phase

same speed

same slit angle but counter-rotating.

Conclusion

The work can guide the physical design of twenty neutron instruments of CSNS.

关键词

Keywords

references

张杰 . 中国散裂中子源(CSNS)——多学科应用的大科学平台 . 中国科学院院刊 , 2006 . 21 ( 05 ): 415 - 417 . DOI: 10.3969/j.issn.1000-3045.2006.05.017 http://doi.org/10.3969/j.issn.1000-3045.2006.05.017 .

Jie ZHANG . CSNS:a large scientific facility for multidisciplinary purposes . Bulletin of Chinese Academy of Sciences , 2006 . 21 ( 05 ): 415 - 417 . DOI: 10.3969/j.issn.1000-3045.2006.05.017 http://doi.org/10.3969/j.issn.1000-3045.2006.05.017 .

王芳卫 , 贾学军 , 梁天骄 , . 散裂中子源靶站谱仪的物理设计 . 物理 , 2008 . 37 ( 6 ): 449 - 453 . DOI: 10.3321/j.issn:0379-4148.2008.06.016 http://doi.org/10.3321/j.issn:0379-4148.2008.06.016 .

Fangwei WANG , Xuejun JIA , Tianjiao LIANG , . Physical design of target station and neutron scattering spectrometers for the Chinese spallation neutron source . Physics , 2008 . 37 ( 6 ): 449 - 453 . DOI: 10.3321/j.issn:0379-4148.2008.06.016 http://doi.org/10.3321/j.issn:0379-4148.2008.06.016 .

陈和生 . 中国散裂中子源 . 现代物理知识 , 2016 . 28 ( 01 ): 3 - 10 . DOI: 10.13405/j.cnki.xdwz.2016.01.001 http://doi.org/10.13405/j.cnki.xdwz.2016.01.001 .

Hesheng CHEN . China spallation neutron source . Modern Physics , 2016 . 28 ( 01 ): 3 - 10 . DOI: 10.13405/j.cnki.xdwz.2016.01.001 http://doi.org/10.13405/j.cnki.xdwz.2016.01.001 .

李新喜 , 黄朝强 , 王燕 , . 双盘斩波器的设计与优化 . 核技术 , 2008 . 31 ( 5 ): 392 - 395 . DOI: 10.3321/j.issn:0253-3219.2008.05.017 http://doi.org/10.3321/j.issn:0253-3219.2008.05.017 http://www.cnki.com.cn/Article/CJFDTotal-HJSU200805017.htm .

Xinxi LI , Chaoqiang HUANG , Yan WANG , . Design and optimization of a double-disk chopper . Nuclear Techniques , 2008 . 31 ( 5 ): 392 - 395 . DOI: 10.3321/j.issn:0253-3219.2008.05.017 http://doi.org/10.3321/j.issn:0253-3219.2008.05.017 http://www.cnki.com.cn/Article/CJFDTotal-HJSU200805017.htm .

李新喜 , 黄朝强 , 王燕 , . 水平散射几何中子反射谱仪的三盘斩波器设计 . 核技术 , 2009 . 32 ( 7 ): 510 - 514 . DOI: 10.3321/j.issn:0253-3219.2009.07.007 http://doi.org/10.3321/j.issn:0253-3219.2009.07.007 http://www.cnki.com.cn/Article/CJFDTotal-HJSU200907009.htm .

Xinxi LI , Chaoqiang HUANG , Yan WANG , . Triple-disk chopper design of horizontal neutron scattering reflectometer . Nuclear Techniques , 2009 . 32 ( 7 ): 510 - 514 . DOI: 10.3321/j.issn:0253-3219.2009.07.007 http://doi.org/10.3321/j.issn:0253-3219.2009.07.007 http://www.cnki.com.cn/Article/CJFDTotal-HJSU200907009.htm .

李新喜 , 王燕 , 黄朝强 , . 盘间距可调斩波器设计及模拟 . 核技术 , 2010 . 33 ( 3 ): 192 - 196 . http://www.cnki.com.cn/Article/CJFDTotal-HJSU201003009.htm .

Xinxi LI , Yan WANG , Chaoqiang HUANG , . Design and simulation of a space-adjustable chopper . Nuclear Techniques , 2010 . 33 ( 3 ): 192 - 196 . http://www.cnki.com.cn/Article/CJFDTotal-HJSU201003009.htm .

杨博 , 王平 , 王芳卫 . CSNS中子带宽限制斩波器样机控制系统的设计与实现 . 核技术 , 2012 . 35 ( 4 ): 305 - 308 . http://www.cnki.com.cn/Article/CJFDTotal-HJSU201204015.htm .

Bo YANG , Ping WANG , Fangwei WANG . Development of the bandwidth-limiting neutron chopper prototype control system for CSNS . Nuclear Techniques , 2012 . 35 ( 4 ): 305 - 308 . http://www.cnki.com.cn/Article/CJFDTotal-HJSU201204015.htm .

S Jaksch . Considerations about chopper configuration at a time-of-flight SANS instrument at a spallation source . Nuclear Instruments and Methods in Physics Research A , 2016 . 835 61 - 65 . DOI: 10.1016/j.nima.2016.07.041 http://doi.org/10.1016/j.nima.2016.07.041 .

R I Bewley , J W Taylor , S M Bennington . LET, a cold neutron multi-disk chopper spectrometer at ISIS . Nuclear Instruments & Methods in Physics Research A , 2011 . 637 ( 1 ): 128 - 134 . DOI: 10.1016/j.nima.2011.01.173 http://doi.org/10.1016/j.nima.2011.01.173 .

G Ehlers , A A Podlesnyak , J L Niedziela , . The new cold neutron chopper spectrometer at the spallation neutron source:design and performance . Review of Scientific Instruments , 2011 . 82 ( 8 ): 085108 DOI: 10.1063/1.3626935 http://doi.org/10.1063/1.3626935 .

P Wang , B Yang , W L Cai . Development of a bandwidth limiting neutron chopper for CSNS . Nuclear Instruments and Methods in Physics A , 2015 . 792 56 - 60 . DOI: 10.1016/j.nima.2015.04.047 http://doi.org/10.1016/j.nima.2015.04.047 .

F Mezei , M Russina . Multiplexing chopper systems for pulsed neutron source instruments . Advances in Neutron Scattering Instrumentation , 2002 . 4785 24 - 33 . DOI: 10.1117/12.451687 http://doi.org/10.1117/12.451687 .

F Mezei . Multiplexing chopper systems for pulsed neutron sources:practical basics . Journal of the Physical Society of Japan , 2013 . 82 1 - 25 . DOI: 10.7566/JPSJS.82SA.SA025 http://doi.org/10.7566/JPSJS.82SA.SA025 .

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

暂无数据