31st International Seminar on Interaction of Neutrons with Nuclei: Fundamental Interactions & Neutrons, Nuclear Structure, Ultracold Neutrons, Related Topics (ISINN-31)

Measurement of CSNS Back-n Neutron Beam Profile with Micromegas

27 May 2025, 09:40

15m

Room V7 (4th floor)

Parallel session 2 Parallel Session 2: Nuclear data for applied and scientific purposes/Neutron detection & Methodical aspects

Speaker

Yang Li (CSNS)

Description

The Back-n white neutron beam line, which uses back-streaming white neutrons from the spallation target of the China Spallation Neutron Source, is used for nuclear data measurements. A Micromegas-based neutron detector with two variants was specially developed to measure the beam spot distribution for this beam line. In this article, the design, fabrication, and characterization of the detector are described. The results of the detector performance tests are presented, which include the relative electron transparency, the gain and the gain uniformity, and the neutron beam profile reconstruction capability. The result of the first measurement of the Back-n neutron beam spot distribution is also presented.