Impurity control of tokamaks with in situ metal deposition
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Authors
Taylor, R.J.
Bunshah, R.F.
Schwirzke, F.
Subjects
Advisors
Date of Issue
1980
Date
1980
Publisher
North-Holland Publishing Company
Language
Abstract
Metal coatings of titanium and chromium of different thickness were deposited in situ in microtor and macrotor tokamaks and tested for impurity control. To improve the microstructure of the metal deposit, Ti and Cr were evaporated at a slow rate of about 20 Å/h during discharge cleaning. A 200 Å fresh metal deposition is required to obtain oxygen free surface layers. The oxygen control by Cr deposits was comparable to the one with Ti coatings. The hydrogen recycling rate increased markedly for Cr deposits. Control measurements show that the problem of hydrogen and deuterium retention in the metal coating during a switchover from one gas to the other can be overcome by short time outgassing to 650 K.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1016/0022-3115(80)90345-1
Series/Report No
Department
Physics and Chemisty
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
US Department of Energy
Funder
Grant No. DE-AM03-76SF00010
Format
5 p.
Citation
Taylor, R. J., R. F. Bunshah, and F. Schwirzke. "Impurity control of tokamaks with in situ metal deposition." Journal of Nuclear Materials 93 (1980): 338-342.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.