NDLI: Operating experience with ESCAR magnet cooling system

Content Provider	IEEE Xplore Digital Library
Author	Byrns, R. Eaton, W. Carrieri, J. Gilbert, W. Lambertson, G. Meuser, R. Rechen, J. Schafer, R. Warren, R.
Copyright Year	1965
Abstract	The ESCAR magnet cooling system has been successfully demonstrated. This two-phase helium cooling system includes a CTI-Sulzer gas-bearing turbine refrigerator with two-stage compression by oil-lubricated screw compressors, 120 m of 5-cm-diameter vacuum-insulated transfer line and twelve series-connected magnet cryostats with weirs for liquid level control. The refrigeration plant provides up to 1900 W of refrigeration at 4.5 K with a mass flow of 113 g/s. Heat load within the transfer line has been measured at 0.25 W/m in sub-system testing. Cool-down times to 4.5 K for the 12 warm-iron magnets with a cold mass of 2500 kg have been about 12 hours. The magnet cryostats separate liquid by gravitational extraction and fill in sequence at a rate of up to 400 ℓ/hr. A heater in the transfer line allows adjustment of the inlet coolant quality (ratio of gas to liquid) to the cryostats; flow instabilities were not present and could not be induced. Pressure levels in the cold bore, beam orbit space were below 10^-10torr. Severe pressure transients, incurred as a result of magnet transitions, have been safely handled both in terms of refrigerator response and cryostat pressure relief. Large gas loads at the compressor suction following magnet transition have not caused overloading or interruption of the refrigeration plant output. An electrical arc punctured the helium vessel and allowed liquid helium to flow into the vacuum space. This was handled by the relief system with no additional damage.
Sponsorship	IEEE Magnetics Society
Starting Page	103
Ending Page	106
Page Count	4
File Size	507856
File Format	PDF
ISSN	00189464
Volume Number	15
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1979-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cooling Magnetic separation Refrigeration Compressors Heat transfer Turbines Fasteners Vacuum systems Level control
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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