Study of fission ionization chamber in CSNS flux monitor system

WANG Qi; BAO Jie; HOU Long; RUAN Xichao; SU Xiaobin; JING Hantao; LI Qiang

doi:10.11889/j.0253-3219.2015.hjs.38.100403

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Study of fission ionization chamber in CSNS flux monitor system

更新时间：2021-03-03

- Study of fission ionization chamber in CSNS flux monitor system
- NUCLEAR TECHNIQUES Vol. 38, Issue 10, Article number: 100403(2015)
- 作者机构：
  
  1. 中国原子能科学研究院核数据重点实验室,北京,102413
  2. 中国科学院高能物理研究所,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.100403
  CLC：
- Published：14 October 2015
- 稿件说明：
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WANG Qi, BAO Jie, HOU Long, et al. Study of fission ionization chamber in CSNS flux monitor system[J]. Nuclear techniques, 2015, 38(10): 100403
DOI：

WANG Qi, BAO Jie, HOU Long, et al. Study of fission ionization chamber in CSNS flux monitor system[J]. Nuclear techniques, 2015, 38(10): 100403 DOI： 10.11889/j.0253-3219.2015.hjs.38.100403.

摘要

将235U与238U两种材料组成的裂变电离室作为散裂中子源反角方向束流监视系统应用的探测器，采用飞行时间方法可以高精度地测量束流的能谱。本文主要介绍整个系统的时间分辨精度对能量分辨的影响以及实际测量中的修正因素，时间分辨引起的能量分辨与能量的3/2幂成正比，能量分辨引起与标准截面的能量差异的修正小于0.1%，实验结果表明该项裂变电离室的设计能满足散裂反角中子能谱测量的要求。

Abstract

Background: The fission ionization chamber is constituted by 235U and 238U materials as monitor in China Spallation Neutron Source (CSNS) reverse angle. Purpose: This paper mainly introduces the whole system time precision influence on the energy resolution and the actual measurement corrections. Method: The flux energy spectrum is measured accurately using n-TOF method. Results: The time resolution which is caused by energy resolution is proportional to 3/2 power energy

and the correction is induced less than 0.1% due to differences of the standard cross section energy. Conclusion: The experimental results show that the design of the ionization chamber can meet the requirements of CSNS neutron flux measurements. Abstract

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