Measurement of the Neutron Beam Profile of the Back-n White Neutron Facility at CSNS with a Micromegas Detector

Binbin Qi,Yang Li，Kejun Zhu,Peng Zhu

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and...（2019）SCI 3区SCI 4区

Cited 11|Views74

Abstract

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.

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Key words

Micromegas detector,Neutron beam profile,White neutron beam,Spallation neutron source

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