Measurement and simulation of the response function of time of flight enhanced diagnostics neutron spectrometer for beam ion studies at EAST tokamak

The 2.5 MeV TOFED(Time-Of-Flight EnhancedDiagnostics)neutron spectrometer with a double-ring structure has been installed at Experimental Advanced Superconducting Tokamak (EAST) to perform advancedneutron emission spectroscopydiagnosis of deuterium plasmas. This work describes the response function of the TOFED spectrometer, which is evaluated for the fully assembled instrument in its final layout. Results from Monte Carlo simulations and dedicated experiments with pulsed light sources are presented and used to determine properties of lighttransport from the scintillator. A GEANT4 model of the TOFED spectrometer was developed to calculate the instrument response matrix. The simulated TOFED response function was successfully benchmarked against measurements of thetime-of-flight spectra for quasi-monoenergeticneutrons in theenergy range of 1-4 MeV. The results are discussed in relation to the capability of TOFED to performbeam ion studies on EAST.

Source: Review of Scientific Instruments - September 20, 2016 Category: Physics Authors: X. Y. Peng, Z. J. Chen, X. Zhang, T. F. Du, Z. M. Hu, L. J. Ge, Y. M. Zhang, J. Q. Sun, G. Gorini, M. Nocente, M. Tardocchi, L. Q. Hu, G. Q. Zhong, N. Pu, S. Y. Lin, B. N. Wan, X. Q. Li, G. H. Zhang, J. X. Chen and T. S. Fan Source Type: research