Investigation of Supersonic Molecular Beam Injection into the HL-1M Tokamak

As a new fueling method, supersonic molecular beam injection (SMBI) has been successfully developed and used in the HL-1M tokamak and HT-7 superconducting tokamak. SMBI can enhance penetration depth and fueling efficiency. It can be considered a significant improvement over conventional gas puffing....

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Bibliographic Details
Published in:Fusion science and technology 2002-07, Vol.42 (1), p.107-115
Main Authors: Yao, Lianghua, Feng, Beibin, Dong, Jaifu, Zhou, Yan, Cui, Zhengying, Cao, Jianyong, Tang, Nianyi, Feng, Zhen, Xiao, Zhenggui, Song, Xianming, Hong, Wenyu, Wang, Enyao, Liu, Yong
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
Carrier concentration
COMPARATIVE EVALUATIONS
EFFICIENCY
ELECTRON DENSITY
Fusion reactions
Fusion reactor divertors
HL-1M TOKAMAK
HYDROGEN
Magnetohydrodynamics
MOLECULAR BEAMS
PELLET INJECTION
PENETRATION DEPTH
PLASMA
PLASMA DENSITY
Superconductivity
Supersonic flow
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Summary:As a new fueling method, supersonic molecular beam injection (SMBI) has been successfully developed and used in the HL-1M tokamak and HT-7 superconducting tokamak. SMBI can enhance penetration depth and fueling efficiency. It can be considered a significant improvement over conventional gas puffing. In recent experiments, hydrogen clusters have been found in the beam produced by high working gas pressure. The hydrogen particles of the beam have penetrated into the plasma center region, in which the average velocity of the injected beam is >1200 m/s. The rate of increase of electron density for SMBI, d[bar]n e /dt, approaches that of small ice pellet injection (PI). The plasma density increases step by step after multipulse SMBI, just as with the effects of multipellet fueling. Comparison of fueling effects was made between SMBI and small ice PI in the same shot of ohmic discharge in HL-1M.
ISSN:1536-1055
1943-7641
DOI:10.13182/FST02-A217