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

ZHONG Guoqiang; HU Liqun; LI Xiaoling; LIN Shiyao; ZHOU Ruijie

Plasma Science and Technology > 2011 > 13(2): 162-166.

ZHONG Guoqiang, HU Liqun, LI Xiaoling, LIN Shiyao, ZHOU Ruijie. Measurement of Neutron Flux at the Initial Phase of Discharge in EAST[J]. Plasma Science and Technology, 2011, 13(2): 162-166.

Citation:

ZHONG Guoqiang, HU Liqun, LI Xiaoling, LIN Shiyao, ZHOU Ruijie. Measurement of Neutron Flux at the Initial Phase of Discharge in EAST[J]. Plasma Science and Technology, 2011, 13(2): 162-166.

Citation:

ZHONG Guoqiang, HU Liqun, LI Xiaoling, LIN Shiyao, ZHOU Ruijie. Measurement of Neutron Flux at the Initial Phase of Discharge in EAST[J]. Plasma Science and Technology, 2011, 13(2): 162-166.

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

Institute of plasma physics, Chinese academy of sciences, Hefei 230031, China

Funds: supported by the Key Program of the National Natural Science Foundation of China (No. 10775041 ) and the National Magnetic Confinement Fusion Science Program (Nos. 2010GB106000, 2010GB106004).

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Abstract

Abstract

Neutron emission in EAST was investigated by a time-resolved monitor systems which consist of four 3He proportion counters and a 235U fission chamber. The D-D neutron flux increased approximately an order of magnitude during the 27 MHz Ion-cyclotron resonance frequency (ICRF) heating, demonstrating that the ICRF wave heated the plasma effectively. In addition in LHW experiment with higher plasma parameters D-D neutrons were also detected. However, a mass 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 runaway electrons and reduce the photoneutrons effectively.
- neutron flux,
- plasma diagnostic,
- EAST tokamak

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