title: Development of the radial neutron camera system for the HL-2A tokamak.
abstract: A new radial neutron camera system has been developed and operated recently in the HL-2A tokamak to measure the spatial and time resolved 2.5 MeV D-D fusion neutron, enhancing the understanding of the energetic-ion physics. The camera mainly consists of a multichannel collimator, liquid-scintillation detectors, shielding systems, and a data acquisition system. Measurements of the D-D fusion neutrons using the camera have been successfully performed during the 2015 HL-2A experiment campaign. The measurements show that the distribution of the fusion neutrons in the HL-2A plasma has a peaked profile, suggesting that the neutral beam injection beam ions in the plasma have a peaked distribution. It also suggests that the neutrons are primarily produced from beam-target reactions in the plasma core region. The measurement results from the neutron camera are well consistent with the results of both a standard (235)U fission chamber and NUBEAM neutron calculations. In this paper, the new radial neutron camera system on HL-2A and the first experimental results are described.
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: Y P
authors.initials: YP
authors.lastname: Zhang
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: J W
authors.initials: JW
authors.lastname: Yang
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: T S
authors.initials: TS
authors.lastname: Fan
authors.affiliation: Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610041, China.
authors.forename: X B
authors.initials: XB
authors.lastname: Luo
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: G L
authors.initials: GL
authors.lastname: Yuan
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: P F
authors.initials: PF
authors.lastname: Zhang
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X F
authors.initials: XF
authors.lastname: Xie
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Song
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Ji
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Physics and State Key Laboratory 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 and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: L J
authors.initials: LJ
authors.lastname: Ge
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: B Z
authors.initials: BZ
authors.lastname: Fu
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5259, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Isobe
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: X M
authors.initials: XM
authors.lastname: Song
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: Z B
authors.initials: ZB
authors.lastname: Shi
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: Q W
authors.initials: QW
authors.lastname: Yang
authors.affiliation: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors.forename: X R
authors.initials: XR
authors.lastname: Duan