Spectroscopic Measurement of Neutral Particle Influx Ratio on EAST

LI Yingying (李颖颖); FU Jia (符佳); SHI Yuejiang (石跃江); ZHANG Wei (张伟); SHEN Yongcai (沈永才); WANG Fudi (王福地); et al

doi:10.1088/1009-0630/15/6/02

Plasma Science and Technology > 2013 > 15(6): 493-498. > DOI: 10.1088/1009-0630/15/6/02

LI Yingying (李颖颖), FU Jia (符佳), SHI Yuejiang (石跃江), ZHANG Wei (张伟), SHEN Yongcai (沈永才), WANG Fudi (王福地), et al. Spectroscopic Measurement of Neutral Particle Influx Ratio on EAST[J]. Plasma Science and Technology, 2013, 15(6): 493-498. DOI: 10.1088/1009-0630/15/6/02

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Spectroscopic Measurement of Neutral Particle Influx Ratio on EAST

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2 School of Natural Sciences, Anhui Agricultural University, Hefei 230036, China

Funds: supported by National Natural Science Foundation of China (Nos. 10975155, 11175208, 10990212) and National Magnetic Confinement Fusion Science Program of China (Nos. 2012GB101000, 2011GB101000, 2011GB107000, 2009GB104003)

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Received Date: December 18, 2011

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Abstract

Abstract

The spectra of HeI (587.6 nm), Hα (656.28 nm) and Dα (656.1 nm) of the helium discharges as well as the normal deuterium discharges have been measured with two optical spec- troscopic multi-channel analysis (OMA) systems on the experimental advanced superconducting tokamak (EAST). The influx ratio of the sum of H and D to He spectral lines and the influx ratio of H to D are given. In this way the ratio of hydrogen/deuterium ion (S/XB)_H/D to (S/XB)_He as well as (S/XB)_H/D is not very sensitive to the variation in the edge density and temperature. The low-density helium discharges are operated in order to reduce the recycling hydrogen fluxes; however, the effect is not obvious. The possible reason is that the number of helium discharges is not enough and the content of hydrogen in the wall is still very abundant, which is caused by frequent wall conditionings and the vacuum leakage. The H/(H+D) ratio decreases quickly after one lithium coating and reduces to less than 10% using several accumulated lithium wall conditioning. It is found that the deposited He atoms on the carbon wall will remain at a low level after several D2 discharges.
- optical spectroscopic multi-channel analysis (OMA),
- influx,
- helium discharges,
- lithium

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