Neutron beam line design of a white neutron source at CSNS

Abstract

Abstract. China Spallation Neutron Source (CSNS), which is under construction, is a large scientific facility dedicated mainly for multi-disciplinary research on material characterization using neutron scattering techniques. The CSNS Phase-I accelerator will deliver a proton beam with an energy of 1.6 GeV and a pulse repetition rate of 25 Hz to a tungsten target, and the beam power is 100 kW. A white neutron source using the back-streaming neutrons through the incoming proton beam channel was proposed and is under construction. The back-streaming neutrons which are very intense and have good time structure are very suitable for nuclear data measurements. The white neutron source includes an 80-m neutron beam line, two experimental halls, and also six different types of spectrometers. The physics design of the beam line is presented in this paper, which includes beam optics and beam characterization simulations, with the emphasis on obtaining extremely low background. The first-batch experiments on nuclear data measurements are expected to be conducted in late 2017.

Energy-resolved fast neutron resonance radiography at CSNS

“…Traveling at light speed, this gamma radiation will reach the target 258 ns after the burst, well ahead from the neutron scintillation signals. This will allow efficient and precise The beamline flux is estimated as 6.8 × 10 6 n/cm 2 /s at the sample position with a proton beam power of 50 kW in single-bunch mode [5,6]. The 60 mm are expected [6].…”

“…This will allow efficient and precise The beamline flux is estimated as 6.8 × 10 6 n/cm 2 /s at the sample position with a proton beam power of 50 kW in single-bunch mode [5,6]. The 60 mm are expected [6]. Therefore the beam divergence is only 0.29 degree.…”

“…The beamline flux is estimated as 6.8 × 10 6 n/cm 2 /s at the sample position with a proton beam power of 50 kW in single-bunch mode [5,6]. The 1.…”

“…White neutron applications use the back-streaming neutrons along with the proton beamline that have a very wide energy spectrum from eV to hundreds of MeV [4,5,6]. A beamline facility called "Back-n WNS" is being constructed to exploit the applications of back-streaming neutrons, as shown in Fig.…”

Development of a 256-channel Time-of-flight Electronics System For Neutron Beam Profiling

“…The proton beam impinges the target at 25Hz and produces high flux neutrons [1]. A facility called "Back-n WNS" in CSNS exploits the application of back-streaming neutrons which have a very wide energy spectrum from eV to hundreds of MeV [2][3] [4]. The structure of the facility is shown in Fig.…”