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Title: Design of a magnetic shielding system for the time of flight enhanced diagnostics neutron spectrometer at Experimental Advanced Superconducting Tokamak

The novel neutron spectrometer TOFED (Time of Flight Enhanced Diagnostics), comprising 90 individual photomultiplier tubes coupled with 85 plastic scintillation detectors through light guides, has been constructed and installed at Experimental Advanced Superconducting Tokamak. A dedicated magnetic shielding system has been constructed for TOFED, and is designed to guarantee the normal operation of photomultiplier tubes in the stray magnetic field leaking from the tokamak device. Experimental measurements and numerical simulations carried out employing the finite element method are combined to optimize the design of the magnetic shielding system. The system allows detectors to work properly in an external magnetic field of 200 G.
Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1] ;  [2] ; ; ; ;  [3]
  1. School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
  2. Southwestern Institute of Physics, Chengdu 610225 (China)
  3. Institute of Plasma Physics, CAS, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
22308616
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; FINITE ELEMENT METHOD; HT-7U TOKAMAK; MAGNETIC FIELDS; MAGNETIC SHIELDING; NEUTRON SPECTROMETERS; OPTICAL FIBERS; PHOTOMULTIPLIERS; PLASTIC SCINTILLATION DETECTORS; STEADY-STATE CONDITIONS; TIME-OF-FLIGHT METHOD