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Performance test of lower hybrid waveguide under long/high-RF power transmission

Abstract

Performance tests of a module for lower hybrid waveguides were carried out at the CEA Cadarache RF Test Facility. For the experiments the test module was fabricated by JAERI, the transmission line of the test bed was modified and the connection waveguides were manufactured by CEA. As the results, the thermal treatment by baking at a higher temperature was the most effective for reducing outgassing during injection of high RF power. The outgassing strongly depended on the temperature of the test module, but was independent to initial temperature. The RF injection reduced outgassing. The outgassing rate decreased to a low level of 10{sup -6}-10{sup -5} Pa m{sup 3}/sec m{sup 2} (10{sup -9}-10{sup -8} Torr 1/sec cm{sup 2}) at 400degC after 450degC-baking. The gas injection did not affect outgassing before and during RF injection. The baking under H{sub 2} or D{sub 2} gas atmosphere were not so effective for reducing outgassing rate. The outgassing rate did not depend on input RF power densities. The temperature in central part of the test module saturated to be {approx}100degC by using of water cooling at a power level of 150 MW/m{sup 2} RF injection, and a neutral gas pressure decreased gradually. In the water  More>>
Authors:
Seki, Masami; Obara, Kenjiro; Maebara, Sunao [1] 
  1. Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment; and others
Publication Date:
Jun 01, 1996
Product Type:
Technical Report
Report Number:
JAERI-Research-96-025
Reference Number:
SCA: 700460; PA: JPN-96:007116; EDB-96:147572; NTS-97:001889; SN: 96001664400
Resource Relation:
Other Information: PBD: Jun 1996
Subject:
70 PLASMA PHYSICS AND FUSION; WAVEGUIDES; LOWER HYBRID HEATING; PERFORMANCE TESTING; TOKAMAK DEVICES; MICROWAVE EQUIPMENT; DEGASSING; TEMPERATURE MEASUREMENT; GHZ RANGE 01-100; POWER RANGE 100-1000 KW
OSTI ID:
368232
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE97700640; TRN: JP9607116
Availability:
INIS; OSTI as DE97700640
Submitting Site:
JPN
Size:
61 p.
Announcement Date:

Citation Formats

Seki, Masami, Obara, Kenjiro, and Maebara, Sunao. Performance test of lower hybrid waveguide under long/high-RF power transmission. Japan: N. p., 1996. Web.
Seki, Masami, Obara, Kenjiro, & Maebara, Sunao. Performance test of lower hybrid waveguide under long/high-RF power transmission. Japan.
Seki, Masami, Obara, Kenjiro, and Maebara, Sunao. 1996. "Performance test of lower hybrid waveguide under long/high-RF power transmission." Japan.
@misc{etde_368232,
title = {Performance test of lower hybrid waveguide under long/high-RF power transmission}
author = {Seki, Masami, Obara, Kenjiro, and Maebara, Sunao}
abstractNote = {Performance tests of a module for lower hybrid waveguides were carried out at the CEA Cadarache RF Test Facility. For the experiments the test module was fabricated by JAERI, the transmission line of the test bed was modified and the connection waveguides were manufactured by CEA. As the results, the thermal treatment by baking at a higher temperature was the most effective for reducing outgassing during injection of high RF power. The outgassing strongly depended on the temperature of the test module, but was independent to initial temperature. The RF injection reduced outgassing. The outgassing rate decreased to a low level of 10{sup -6}-10{sup -5} Pa m{sup 3}/sec m{sup 2} (10{sup -9}-10{sup -8} Torr 1/sec cm{sup 2}) at 400degC after 450degC-baking. The gas injection did not affect outgassing before and during RF injection. The baking under H{sub 2} or D{sub 2} gas atmosphere were not so effective for reducing outgassing rate. The outgassing rate did not depend on input RF power densities. The temperature in central part of the test module saturated to be {approx}100degC by using of water cooling at a power level of 150 MW/m{sup 2} RF injection, and a neutral gas pressure decreased gradually. In the water cooling case, the outgassing rate was very low less than 10{sup -7} Pa m{sup 3}/sec m{sup 2} (10{sup -10} Torr 1/sec cm{sup 2}). The steady state RF injection was demonstrated with water cooling. (author).}
place = {Japan}
year = {1996}
month = {Jun}
}