Design method of bandwidth limiting neutron chopper system in CSNS

Weiliang CAI; Ping WANG; Qing ZHANG; Yansheng GENG; Wenxiang ZHANG

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

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Design method of bandwidth limiting neutron chopper system in CSNS

LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS | 更新时间：2021-05-19

- Design method of bandwidth limiting neutron chopper system in CSNS
- NUCLEAR TECHNIQUES Vol. 41, Issue 12, Article number: 120202(2018)
- 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：
- 基金信息：
  
  Youth Innovation Promotion Association of Chinese Academy of Sciences
- DOI：10.11889/j.0253-3219.2018.hjs.41.120202
  CLC： TL99
- Received：07 August 2018，
  
  Revised：16 October 2018，
  
  Published：10 December 2018
- 稿件说明：
移动端阅览
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：

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

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