Abstract
The China spallation neutron source (CSNS) was built and started running since 2018. It produces neutrons by impinging 1.6 GeV protons onto a tungsten target with 25 Hz repetition frequency. A beam line exploiting the back-streaming neutrons (Back-n) was built mainly for nuclear data measurement and started commissioning simultaneously with CSNS in 2018. There are two experimental endstations along the Back-n beam line: endstation 1 (#ES1) with a neutron flight path of about 55 m and endstation 2 (#ES2) with about 76 m. The neutron energy spectra of both #ES1 and #ES2 were measured since it is important for feasibility study and analysis. In this paper, the measurement of the neutron energy spectrum of Back-n #ES1 is reported. It is measured by a multi-layer fission chamber using the 235U samples as the neutron converters. The neutron energy spectrum from 0.1 eV to 30 MeV is obtained. The integral neutron flux (from 0.1 eV to 30 MeV) normalized to the proton beam power of 100 kW is 1.55×107 neutrons/cm2/s.
Highlights
The China Spallation Neutron Source (CSNS) is the first spallation neutron source in China
This paper presents the measurement of the neutron energy spectrum of back-streaming neutrons (Back-n) endstation 1 (#ES1) and reports the first results
This contribution reports the measurement of neutron energy spectrum of CSNS Back-n #ES1 by the MFC
Summary
The China Spallation Neutron Source (CSNS) is the first spallation neutron source in China. It is the largest proton accelerator ever built in China up to now [1,2,3]. CSNS mainly supports the multidisciplinary research based on the neutron scattering technique [4, 5]. It is capable of supporting multiple platforms, such as the application of high energy protons, muon beam and white neutron beam [6]. The neutron energy spectrum of Back-n is characterized since it is of great im-
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