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Development of automatic control method for cryopump system for JT-60 neutral beam injector

Technical Report:

Abstract

A cryopump system for JT-60 neutral beam injector (NBI) is composed of 14 cryopumps with the largest total pumping speed of 20000 m{sup 3}/s in the world, which are cooled by liquid helium through a long-distance liquid helium transferline of about 500 m from a helium refrigerator with the largest capacity of 3000 W at 3.6 K in Japan. An automatic control method of the cryopump system has been developed and tested. Features of the automatic control method are as follows. 1) Suppression control of the thermal imbalance in cooling-down of the 14 cryopumps. 2) Stable cooling control of the cryopump due to liquid helium supply to six cryopanels by natural circulation in steady-state mode. 3) Stable liquid helium supply control for the cryopumps from the liquid helium dewar in all operation modes of the cryopumps, considering the helium quantities held in respective components of the closed helium loop. 4) Stable control of the helium refrigerator for the fluctuation in thermal load from the cryopumps and the change of operation mode of the cryopumps. In the automatic operation of the cryopump system by the newly developed control method, the cryopump system including the refrigerator was stably operated for all operation  More>>
Authors:
Shibanuma, Kiyoshi; Akino, Noboru; Dairaku, Masayuki; Ohuchi, Yutaka; Shibata, Takemasa [1] 
  1. Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-180
Reference Number:
SCA: 700480; 700350; PA: JPN-91:011231; SN: 92000630647
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CRYOPUMPS; JT-60U TOKAMAK; NEUTRAL BEAM SOURCES; CONTROL SYSTEMS; HELIUM; TWO-PHASE FLOW; REFRIGERATION; 700480; 700350; COMPONENT DEVELOPMENT; MATERIALS STUDIES; PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS
OSTI ID:
10110905
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92751040; TRN: JP9111231
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
47 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Shibanuma, Kiyoshi, Akino, Noboru, Dairaku, Masayuki, Ohuchi, Yutaka, and Shibata, Takemasa. Development of automatic control method for cryopump system for JT-60 neutral beam injector. Japan: N. p., 1991. Web.
Shibanuma, Kiyoshi, Akino, Noboru, Dairaku, Masayuki, Ohuchi, Yutaka, & Shibata, Takemasa. Development of automatic control method for cryopump system for JT-60 neutral beam injector. Japan.
Shibanuma, Kiyoshi, Akino, Noboru, Dairaku, Masayuki, Ohuchi, Yutaka, and Shibata, Takemasa. 1991. "Development of automatic control method for cryopump system for JT-60 neutral beam injector." Japan.
@misc{etde_10110905,
title = {Development of automatic control method for cryopump system for JT-60 neutral beam injector}
author = {Shibanuma, Kiyoshi, Akino, Noboru, Dairaku, Masayuki, Ohuchi, Yutaka, and Shibata, Takemasa}
abstractNote = {A cryopump system for JT-60 neutral beam injector (NBI) is composed of 14 cryopumps with the largest total pumping speed of 20000 m{sup 3}/s in the world, which are cooled by liquid helium through a long-distance liquid helium transferline of about 500 m from a helium refrigerator with the largest capacity of 3000 W at 3.6 K in Japan. An automatic control method of the cryopump system has been developed and tested. Features of the automatic control method are as follows. 1) Suppression control of the thermal imbalance in cooling-down of the 14 cryopumps. 2) Stable cooling control of the cryopump due to liquid helium supply to six cryopanels by natural circulation in steady-state mode. 3) Stable liquid helium supply control for the cryopumps from the liquid helium dewar in all operation modes of the cryopumps, considering the helium quantities held in respective components of the closed helium loop. 4) Stable control of the helium refrigerator for the fluctuation in thermal load from the cryopumps and the change of operation mode of the cryopumps. In the automatic operation of the cryopump system by the newly developed control method, the cryopump system including the refrigerator was stably operated for all operation modes of the cryopumps, so that the cool-down of 14 cryopumps was completed in 16 hours from the start of cool-down of the system and the cryopumps was stably cooled by natural circulation cooling in steady-state mode. (author).}
place = {Japan}
year = {1991}
month = {Oct}
}