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Carbon sheet pumping

Technical Report:

Abstract

A new hydrogen pumping scheme has been proposed which controls recycling of the particles for significant improvement of the energy confinement in toroidal magnetic fusion devices. In this scheme, a part of the vacuum vessel surface near the divertor is covered with carbon sheets of a large surface area. Before discharge initiation, the sheets are baked up to 700 {approx} 1000degC to remove the previously trapped hydrogen atoms. After being cooled down to below {approx} 200degC, the unsaturated carbon sheets trap high energy charge exchange hydrogen atoms effectively during a discharge and overall pumping efficiency can be as high as {approx} 50 %. (author).
Publication Date:
Jul 01, 1993
Product Type:
Technical Report
Report Number:
NIFS-237
Reference Number:
SCA: 700420; PA: JPN-93:011211; EDB-94:016725; ERA-19:006097; NTS-94:015032; SN: 93001119427
Resource Relation:
Other Information: PBD: Jul 1993
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; VACUUM PUMPS; THERMONUCLEAR REACTORS; ULTRAHIGH VACUUM; ADSORPTION; GRAPHITE; HYDROGEN; RECYCLING; SORPTIVE PROPERTIES; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; 700420; PLASMA-FACING COMPONENTS
OSTI ID:
10110165
Research Organizations:
National Inst. for Fusion Science, Nagoya (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE94727624; TRN: JP9311211
Availability:
OSTI; NTIS; INIS
Submitting Site:
JPN
Size:
14 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ohyabu, N, Sagara, A, Kawamura, T, Motojima, O, and Ono, T. Carbon sheet pumping. Japan: N. p., 1993. Web.
Ohyabu, N, Sagara, A, Kawamura, T, Motojima, O, & Ono, T. Carbon sheet pumping. Japan.
Ohyabu, N, Sagara, A, Kawamura, T, Motojima, O, and Ono, T. 1993. "Carbon sheet pumping." Japan.
@misc{etde_10110165,
title = {Carbon sheet pumping}
author = {Ohyabu, N, Sagara, A, Kawamura, T, Motojima, O, and Ono, T}
abstractNote = {A new hydrogen pumping scheme has been proposed which controls recycling of the particles for significant improvement of the energy confinement in toroidal magnetic fusion devices. In this scheme, a part of the vacuum vessel surface near the divertor is covered with carbon sheets of a large surface area. Before discharge initiation, the sheets are baked up to 700 {approx} 1000degC to remove the previously trapped hydrogen atoms. After being cooled down to below {approx} 200degC, the unsaturated carbon sheets trap high energy charge exchange hydrogen atoms effectively during a discharge and overall pumping efficiency can be as high as {approx} 50 %. (author).}
place = {Japan}
year = {1993}
month = {Jul}
}