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

Z Q Cui; Z J Chen; X F Xie; X Y Peng; Z M Hu; T F Du; L J Ge; X Zhang; X Yuan; Z W Xia; L Q Hu; G Q Zhong; S Y Lin; B N Wan; T S Fan; J X Chen; X Q Li; G H Zhang

doi:10.1063/1.4890536

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

Rev Sci Instrum. 2014 Nov;85(11):11D829. doi: 10.1063/1.4890536.

Authors

Z Q Cui¹, Z J Chen¹, X F Xie¹, X Y Peng¹, Z M Hu¹, T F Du¹, L J Ge¹, X Zhang¹, X Yuan¹, Z W Xia², L Q Hu³, G Q Zhong³, S Y Lin³, B N Wan³, T S Fan¹, J X Chen¹, X Q Li¹, G H Zhang¹

Affiliations

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.

PMID: 25430242
DOI: 10.1063/1.4890536

Abstract

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.