Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (3): 30201-030201.doi: 10.11889/j.0253-3219.2020.hjs.43.030201

• ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS • Previous Articles    

A simulation study of the deflected neutron guide of neutron spin-echo spectrometer at CMRR

Baihua WANG1,2,Chaoqiang HUANG1,2(),Tingting WANG1,2,Guang'ai SUN1,2,Yan WANG1,2   

  1. 1.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, China
    2.Key Laboratory of Neutron Physics, China Academy of Engineering Physics, Mianyang 621999, China
  • Received:2019-09-09 Revised:2020-01-13 Online:2020-03-15 Published:2020-03-24
  • Contact: Chaoqiang HUANG E-mail:huangcq@caep.ac.cn;huangcq@caep.cn
  • About author:WANG Baihua, male, born in 1994, graduated from Sichuan University in 2017, master student, focusing on neutron scattering techniques and applications
  • Supported by:
    National Natural Science Foundation of China(U1830205);National Key Research and Development Program of China

Abstract: Background

Neutron beam is provided for the spin-echo spectrometer at China Mianyang Research Reactor (CMRR) by neutron deflection at the upper part of the C32 exit of the C3 cold neutron guide. The deflected neutron guide consists of curved guide pipe and straight guide pipe with cross-section 30 mm (W)×30 mm (H).

Purpose

This study aims to validate the design scheme of the deflected neutron guide by simulation. The parameters including the number of the channels of the curved guide, the radius of the curved guide and the supermirror factor of the deflected neutron guide.

Methods

Neutron ray-tracing package McStas version 2.5 was employed to perform Monte Carlo simulation to investigate the effects of the parameters of the deflected neutron guide on the neutron flux, energy spectrum and beam divergence at the exit and sample position of the deflected neutron guide. The parameters of the curved guide pipe such as the number of the channels, the radius, and the supermirror factor of the deflected neutron guide were studied as well.

Results

The results show that: 1) it is reasonable to divide the curved guide into 6 channels vertically; 2) the radius of the curved guide should be as large as possible when the space meet the requirements to the installation of the spectrometer; 3) the neutron flux is close to the maximum flux while the supermirror is 2.5.

Conclusions

According to simulation results, the design scheme for deflected neutron guide is achievable by using 6 channels with the radius 0f 40.0 m and the supermirror factor of 2.5.

Key words: China Mianyang research reactor, Monte Carlo simulation, Deflected neutron guide, Curved guide, McStas

CLC Number: 

  • TL817+.9,TL99