NDLI: Comparative study of glow discharge wall conditioning using H2 and Ar-H2 gas mixture of ADITYA Tokamak vacuum vessel

Content Provider	IEEE Xplore Digital Library
Author	Jadeja, K.A. Patel, K.M. Tanna, R.L. Sangwan, D. Acharya, K.S. Patel, N.D. Raval, M.K. Kumar, P. Bhatt, S.B. Ghosh, J.
Copyright Year	2014
Description	Author affiliation: Inst. for Plasma Res., Bhat, India (Jadeja, K.A.; Patel, K.M.; Tanna, R.L.; Sangwan, D.; Acharya, K.S.; Patel, N.D.; Raval, M.K.; Kumar, P.; Bhatt, S.B.; Ghosh, J.)
Abstract	Low temperature glow discharge wall conditioning (GDC) using $H_{2}$ gas is effective in reduction of oxygen and carbon (low-Z) contain impurities on near surface region of vessel wall. The high retention of hydrogen in vessel wall/components due to long operation of $H_{2}$ GDC increases hydrogen out-gassing during tokamak operation and affects the production of high temperature plasma. The hydrogen retention can be reduced using inert gas GDC by sputter cleaning for short duration. But in that case the out-gassing rate of inert gas increases, that again impairs the plasma performance. To overcome above problems, the GDC with hydrogen-inert gas mixture can be used for better removal of C and O surface contaminants and low hydrogen retention in surface. In ADITYA tokamak, $H_{2}-GDC$ is carried out regularly after plasma operation, while the GDC with argon-hydrogen $(Ar-H_{2})$ mixture has been experimentally tested to observe the reduction of oxygen and carbon impurities along with low hydrogen retention. In $Ar-H_{2}$ GDC, the reason being the formation of $ArH^{+}$ hydride ions, which has quite long life and more energy compared to $H_{2}^{+}$ ions formed in $H_{2}$ GDC for breaking the bond of wall molecules. A systematic comparative study of $H_{2}$ GDC and $Ar-H_{2}$ Mixture GDC by changing the mixture ratio has been carried out in ADITYA tokamak. The relative levels of oxygen and carbon contain impurities have been measured using residual gas analyzer in both GDC's. We have observed a substantial reduction in oxygen and carbon impurities with a significant improvement in wall condition with $Ar-H_{2}$ GDC compared to the $H_{2}$ GDC. The effect of wall conditioning by $Ar-H_{2}$ GDC on the performance of high temperature plasma operation will be presented in this paper.
Sponsorship	Plansee
Starting Page	673
Ending Page	676
File Size	387494
Page Count	4
File Format	PDF
ISBN	9781479967506
e-ISBN	9781479967520
DOI	10.1109/DEIV.2014.6961772
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-28
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasma temperature Carbon Impurities Discharges (electric) Hydrogen Argon
Content Type	Text
Resource Type	Article

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