Measurement of Neutron Flux at the Initial Phase of Discharge in EAST

Neutron emission in EAST was investigated by a time-resolved monitor system which consists of four 3He proportional counters and a 235U fission chamber. The D-D neutron flux increased approximately an order of magnitude during the 27 MHz ion-cyclotron radio frequency （ICRF） heating, demonstrating th...

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Bibliographic Details
Published inPlasma science & technology Vol. 13; no. 2; pp. 162 - 166
Main Author 钟国强 胡立群 李晓玲 林士耀 周瑞杰
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.04.2011
Subjects
ICRF
中子通量
卸货
正比计数器
测量
热等离子体
等离子体参数
等离子体密度
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Summary:Neutron emission in EAST was investigated by a time-resolved monitor system which consists of four 3He proportional counters and a 235U fission chamber. The D-D neutron flux increased approximately an order of magnitude during the 27 MHz ion-cyclotron radio frequency （ICRF） heating, demonstrating that the ICRF wave heated the plasma effectively. In addition in lower hybrid wave （LHW） experiment with higher plasma parameters D-D neutrons were also detected. However, masses of photoneutrons were generated in Ohmic discharges with low plasma density. Effect of plasma density on the production of photoneutrons was studied, and it is found that LHW can suppress the generation of the runaway electrons and reduce the share of the photoneutrons effectively.
Bibliography:neutron flux, plasma diagnostic, EAST tokamak
Neutron emission in EAST was investigated by a time-resolved monitor system which consists of four 3He proportional counters and a 235U fission chamber. The D-D neutron flux increased approximately an order of magnitude during the 27 MHz ion-cyclotron radio frequency （ICRF） heating, demonstrating that the ICRF wave heated the plasma effectively. In addition in lower hybrid wave （LHW） experiment with higher plasma parameters D-D neutrons were also detected. However, masses of photoneutrons were generated in Ohmic discharges with low plasma density. Effect of plasma density on the production of photoneutrons was studied, and it is found that LHW can suppress the generation of the runaway electrons and reduce the share of the photoneutrons effectively.
ZHONG Guoqiang , HU Liqun , LI Xiaoling, LIN Shiyao, ZHOU Ruijie （Institute of plasma physics, Chinese academy of sciences, Hefei 230031, China）
34-1187/TL
ISSN:1009-0630
DOI:10.1088/1009-0630/13/2/07