Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (2): 20202-020202.doi: 10.11889/j.0253-3219.2018.hjs.41.020202

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Neutron physical parameter's simulation of CMRR cold neutron source

HUO Heyong1,2, SUN Yong1, TANG Bin1, YIN Wei1, LIU Bin1, WU Yang1, CAO Chao1, WANG Sheng1, LI Hang1   

  1. 1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
    2. Key Laboratory of Neutron Physics, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2017-09-29 Revised:2017-11-18 Online:2018-02-10 Published:2018-02-06
  • Supported by:
    Supported by National Key R&D Program of China (No.2016YFA0401502), Nuclear Safety (No.41426020401), Key Basic Research Program (No.JCKY2017212B002), National Natural Science Foundation of China (No.11605168, No.11405153, No.11375156, No.11675153)

Abstract: [Background] Cold neutron is generally yielded by cold neutron source (CNS) in large-size neutron source. The wavelength of cold neutron is similar to that of molecular or atomic structure of lots of materials, which could be adopted to study material macroscopical or macroscopic structure. [Purpose] This paper aims to provide input data for neutron transportation in neutron guide and shielding calculation of China Mianyang Research Reactor (CMRR). [Methods] CNS was modeled, and ortho-hydrogen and para-hydrogen Monte Carlo database was processed. We calculated the neutron flux in different depths inside the liquid hydrogen moderator, neutron angular distribution and cold neutron gain in the cold neutron (CN) channel's entrance, and got the neutron angular and spatial distributions at the intake of neutron guide. [Results] The results showed that liquid hydrogen could enhance the cold neutron gain, and neutron beam collimation was promoted by CN horizontal channel. [Conclusion] The calculation indicates CNS may significantly improve the performance of neutron beam.

Key words: CNS, Physical parameter, Simulated calculation, CMRR

CLC Number: 

  • TL99