title: Design of a magnetic shielding system for the time of flight enhanced diagnostics neutron spectrometer at Experimental Advanced Superconducting Tokamak.
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.
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Cui
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Chen
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X F
authors.initials: XF
authors.lastname: Xie
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Peng
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Hu
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: T F
authors.initials: TF
authors.lastname: Du
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: L J
authors.initials: LJ
authors.lastname: Ge
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X
authors.initials: X
authors.lastname: Yuan
authors.affiliation: Southwestern Institute of Physics, Chengdu 610225, China.
authors.forename: Z W
authors.initials: ZW
authors.lastname: Xia
authors.affiliation: Institute of Plasma Physics, CAS, Hefei 230031, China.
authors.forename: L Q
authors.initials: LQ
authors.lastname: Hu
authors.affiliation: Institute of Plasma Physics, CAS, Hefei 230031, China.
authors.forename: G Q
authors.initials: GQ
authors.lastname: Zhong
authors.affiliation: Institute of Plasma Physics, CAS, Hefei 230031, China.
authors.forename: S Y
authors.initials: SY
authors.lastname: Lin
authors.affiliation: Institute of Plasma Physics, CAS, Hefei 230031, China.
authors.forename: B N
authors.initials: BN
authors.lastname: Wan
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: T S
authors.initials: TS
authors.lastname: Fan
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: J X
authors.initials: JX
authors.lastname: Chen
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Li
authors.affiliation: School of Physics, State Key Lab of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: G H
authors.initials: GH
authors.lastname: Zhang