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Title: TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps

Abstract

The TFTR vacuum vessel will have a system of four 61 cm diameter mercury diffusion pumps to provide a base pressure in the 10/sup -8/ to 10/sup -9/ Torr range as well as a low impurity level within the vessel. The system, called the Torus Vacuum Pumping System (TVPS), will be employed with the aid of an occasional 250/sup 0/C bakeout in situ as well as periodic applications of aggressive discharge cleaning. The TVPS is an ultrahigh-vacuum (UHV) system using no elastomers as well as being a closed system with respect to tritium or any tritiated gases. The backing system employing approximately 75 all-metal isolation valves is designed with the features of redundancy and flexibility employed in a variety of ways to meet the fundamental requirements and functions enumerated for the TVPS. Since the design, is one which is a modification of the conceptual design of the TVPS, those features which have changed are discussed. Calculations are presented for the major performance parameters anticipated for the TVPS and include conductances, effective pumping speeds, base pressures, operating parameters, getter pump parameters, and calculations of time constants associated with leak checking. Modifications in the vacuum pumping system for the guard regions onmore » the twelve bellows sections are presented so that it is compatible with the main TVPS. The bellows pumping system consists of a mechanical pump unit, a zirconium aluminum getter pump unit and a residual gas analyzer. The control and management of the TVPS is described with particular attention given to providing both manual and automatic control at a local station and at the TFTR Central Control. Such operations as testing, maintenance, leak checking, startup, bakeout, and various other operations are considered in some detail. Various aspects related to normal pulsing, discharge cleaning, non-tritium operations and tritium operations are also taken into consideration. A cost estimate is presented.« less

Authors:
;
Publication Date:
Research Org.:
Westinghouse Electric Corp., Pittsburgh, Pa. (USA). Fusion Power Systems Dept.
OSTI Identifier:
5438585
Report Number(s):
WFPS-TME-034
TRN: 78-002132
DOE Contract Number:  
EY-76-C-02-3073
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TFTR DEVICE; VACUUM SYSTEMS; VACUUM PUMPS; PERFORMANCE TESTING; COST; MAINTENANCE; CLOSED PLASMA DEVICES; LABORATORY EQUIPMENT; PUMPS; TESTING; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; 700209* - Fusion Power Plant Technology- Component Development & Materials Testing

Citation Formats

Sink, D. A., and Sniderman, M. TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps. United States: N. p., 1976. Web. doi:10.2172/5438585.
Sink, D. A., & Sniderman, M. TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps. United States. https://doi.org/10.2172/5438585
Sink, D. A., and Sniderman, M. 1976. "TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps". United States. https://doi.org/10.2172/5438585. https://www.osti.gov/servlets/purl/5438585.
@article{osti_5438585,
title = {TFTR ultrahigh-vacuum pumping system incorporating mercury diffusion pumps},
author = {Sink, D. A. and Sniderman, M.},
abstractNote = {The TFTR vacuum vessel will have a system of four 61 cm diameter mercury diffusion pumps to provide a base pressure in the 10/sup -8/ to 10/sup -9/ Torr range as well as a low impurity level within the vessel. The system, called the Torus Vacuum Pumping System (TVPS), will be employed with the aid of an occasional 250/sup 0/C bakeout in situ as well as periodic applications of aggressive discharge cleaning. The TVPS is an ultrahigh-vacuum (UHV) system using no elastomers as well as being a closed system with respect to tritium or any tritiated gases. The backing system employing approximately 75 all-metal isolation valves is designed with the features of redundancy and flexibility employed in a variety of ways to meet the fundamental requirements and functions enumerated for the TVPS. Since the design, is one which is a modification of the conceptual design of the TVPS, those features which have changed are discussed. Calculations are presented for the major performance parameters anticipated for the TVPS and include conductances, effective pumping speeds, base pressures, operating parameters, getter pump parameters, and calculations of time constants associated with leak checking. Modifications in the vacuum pumping system for the guard regions on the twelve bellows sections are presented so that it is compatible with the main TVPS. The bellows pumping system consists of a mechanical pump unit, a zirconium aluminum getter pump unit and a residual gas analyzer. The control and management of the TVPS is described with particular attention given to providing both manual and automatic control at a local station and at the TFTR Central Control. Such operations as testing, maintenance, leak checking, startup, bakeout, and various other operations are considered in some detail. Various aspects related to normal pulsing, discharge cleaning, non-tritium operations and tritium operations are also taken into consideration. A cost estimate is presented.},
doi = {10.2172/5438585},
url = {https://www.osti.gov/biblio/5438585}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 01 00:00:00 EDT 1976},
month = {Tue Jun 01 00:00:00 EDT 1976}
}