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FT Tokamak Upgrade (FTU) vacuum vessel section cleaning by glow discharge in hydrogen

Technical Report:

Abstract

The possibility of applying glow discharge in hydrogen for the cleaning of the FTU (Frascati Tokamak Upgrade) vacuum chamber was analyzed on a 1:1 scale toroidal section by using the same operating conditions as foreseen for the machine. The discharge was maintained for six hours in the chamber with the wall temperature kept at 150 degrees C. The partial pressures at the end of the cleaning run were compared with those obtained by using only thermal outgassing at the same temperature. A reduction of about a factor of two in the H/sub 2/0 and C0/sub 2/ partial pressures was observed, related to a better cleanness of the surface. It was found that the high temperature during the glow discharge cleaning not only increases the efficiency of the discharge, but it is an efficient tool to remove impurities from the hidden regions, defined by the thermal shields that cover all the vacuum vessel walls not directly exposed to the glow discharge.
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
ENEA-RT-NUCL-90-28; RT/NUCL-90-28
Reference Number:
SCA: 700480; 700420; PA: ITAN-91:002106; SN: 92000621841
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; THERMONUCLEAR REACTOR WALLS; SURFACE CLEANING; FT TOKAMAK; IMPURITIES; HYDROGEN; GLOW DISCHARGES; PRESSURE DEPENDENCE; TEMPERATURE DEPENDENCE; PERFORMANCE TESTING; 700480; 700420; COMPONENT DEVELOPMENT; MATERIALS STUDIES; PLASMA-FACING COMPONENTS
OSTI ID:
10107692
Research Organizations:
ENEA, Frascati (Italy). Area Nucleare
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1120-5598; Other: ON: DE92744032; TRN: 91:002106
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
ITAN
Size:
20 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ciotti, M, Apicella, M L, Verdini, L, and Ferro, C. FT Tokamak Upgrade (FTU) vacuum vessel section cleaning by glow discharge in hydrogen. Italy: N. p., 1991. Web.
Ciotti, M, Apicella, M L, Verdini, L, & Ferro, C. FT Tokamak Upgrade (FTU) vacuum vessel section cleaning by glow discharge in hydrogen. Italy.
Ciotti, M, Apicella, M L, Verdini, L, and Ferro, C. 1991. "FT Tokamak Upgrade (FTU) vacuum vessel section cleaning by glow discharge in hydrogen." Italy.
@misc{etde_10107692,
title = {FT Tokamak Upgrade (FTU) vacuum vessel section cleaning by glow discharge in hydrogen}
author = {Ciotti, M, Apicella, M L, Verdini, L, and Ferro, C}
abstractNote = {The possibility of applying glow discharge in hydrogen for the cleaning of the FTU (Frascati Tokamak Upgrade) vacuum chamber was analyzed on a 1:1 scale toroidal section by using the same operating conditions as foreseen for the machine. The discharge was maintained for six hours in the chamber with the wall temperature kept at 150 degrees C. The partial pressures at the end of the cleaning run were compared with those obtained by using only thermal outgassing at the same temperature. A reduction of about a factor of two in the H/sub 2/0 and C0/sub 2/ partial pressures was observed, related to a better cleanness of the surface. It was found that the high temperature during the glow discharge cleaning not only increases the efficiency of the discharge, but it is an efficient tool to remove impurities from the hidden regions, defined by the thermal shields that cover all the vacuum vessel walls not directly exposed to the glow discharge.}
place = {Italy}
year = {1991}
month = {Sep}
}