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Title: A novel scheme to handle highly pulsed loads with a standard helium refrigerator

Abstract

Helium refrigerator performance degrades rapidly when it has to handle a varying or pulsed heat load. A novel scheme is presented to handle highly pulsed 4.5 K cryogenic loads with a standard helium refrigerator by isolating it from these pulses. The scheme uses a relatively simple arrangement of control valves, heat exchangers, and a storage dewar. Applications include pulsed tokamak machines such as TPX (Tokamak Physics Experiment) and ITER (International Thermonuclear Experimental Reactor). For example, the TPX (currently in the conceptual design phase in a DoE contract) requires an average 4.5 K refrigerator capacity of about 10 kW; however, pulsed loads caused by eddy current and nuclear heating will exceed 100 kW. The scheme presented here provides a method for handling these pulsed loads. Because of the simple and proven nature of the components involved and the thermodynamic properties of the helium, the system could be implemented for projects such as TPX or ITER with little or no development.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10181079
Report Number(s):
UCRL-JC-112599; CONF-930703-26
ON: DE93019617
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: International cryogenic materials conference (ICMC),Albuquerque, NM (United States),12-16 Jul 1993; Other Information: PBD: 30 Jun 1993
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; HELIUM DILUTION REFRIGERATORS; HEAT TRANSFER; TOKAMAK DEVICES; HELIUM DILUTION REFRIGERATION; PULSE TECHNIQUES; PERFORMANCE; PRESSURE CONTROL; HEAT EXCHANGERS; 700480; COMPONENT DEVELOPMENT; MATERIALS STUDIES

Citation Formats

Slack, D S. A novel scheme to handle highly pulsed loads with a standard helium refrigerator. United States: N. p., 1993. Web.
Slack, D S. A novel scheme to handle highly pulsed loads with a standard helium refrigerator. United States.
Slack, D S. Wed . "A novel scheme to handle highly pulsed loads with a standard helium refrigerator". United States. https://www.osti.gov/servlets/purl/10181079.
@article{osti_10181079,
title = {A novel scheme to handle highly pulsed loads with a standard helium refrigerator},
author = {Slack, D S},
abstractNote = {Helium refrigerator performance degrades rapidly when it has to handle a varying or pulsed heat load. A novel scheme is presented to handle highly pulsed 4.5 K cryogenic loads with a standard helium refrigerator by isolating it from these pulses. The scheme uses a relatively simple arrangement of control valves, heat exchangers, and a storage dewar. Applications include pulsed tokamak machines such as TPX (Tokamak Physics Experiment) and ITER (International Thermonuclear Experimental Reactor). For example, the TPX (currently in the conceptual design phase in a DoE contract) requires an average 4.5 K refrigerator capacity of about 10 kW; however, pulsed loads caused by eddy current and nuclear heating will exceed 100 kW. The scheme presented here provides a method for handling these pulsed loads. Because of the simple and proven nature of the components involved and the thermodynamic properties of the helium, the system could be implemented for projects such as TPX or ITER with little or no development.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {6}
}

Conference:
Other availability
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