Two phase liquid helium flow testing to simulate the operation of a cryocondensation pump in the DIII-D tokamak

G. J. Laughon; C. B. Baxi; G. L. Campbell; M. A. Mahdavi; C. C. Makariou; M. M. Menon; J. P. Smith; M. J. Schaffer; K. M. Schaubel

doi:10.1016/S0011-2275(05)80082-7

Two phase liquid helium flow testing to simulate the operation of a cryocondensation pump in the DIII-D tokamak

G. J. Laughon, C. B. Baxi, G. L. Campbell, M. A. Mahdavi, C. C. Makariou, M. M. Menon, J. P. Smith, M. J. Schaffer, K. M. Schaubel

Research output: Contribution to journal › Article › peer-review

Abstract

A liquid helium-cooled cryocondensation pump has been installed in the DIII=D tokamak fusion energy research experiment at General Atomics. The pump is located within the tokamak vacuum chamber beneath the divertor baffle plates and is utilized for plasma density and contamination control. Two-phase helium flows through the pump at 5 to 10 g/s utilizing the beat transfer and constant temperature characteristics of boiling liquid helium. The pump is designed for a pumping speed of 32,0001/s. Extensive testing was performed with a prototypical pump test fixture. Several pump geometries (simple tube, coaxial flow plug, and coaxial slotted insert) were tested, in an iterative process, to determine which was the most satisfactory for stable cryocondensation pumping. Results from the different tests illustrating the temperature distribution and flow characteristics for each configuration are presented.

Original language	English
Pages (from-to)	365-368
Number of pages	4
Journal	Cryogenics
Volume	34
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/S0011-2275(05)80082-7
State	Published - 1994
Externally published	Yes

Funding

G.J. Laughon, C.B. Baxi, G.L. Campbell, M.A. Mahdavi, C.C. Makariou, M.M. Menon,t J,P. Smith, M.J. Schaffer, K.M. Schaubel General Atomics, P.O. Box 85608, San Diego, California 92186-9784 *Work supported by the U.S. Department of Energy under Contract Nos. DE-AC03-89ER51114 and DE-AC05-84OR21400. tOak Ridge National Laboratory A liquid helium-cooled cryocondensation pump has been installed in the DIII-D tokamak fusion energy research experiment at General Atomics, The pump is located within the tokamak vacuum chamber beneath the divertor baffle plates and is utilized for plasma density and contamination control. Two-phase helium flows through the pump at 5 to 10 g/s utilizing the heat transfer and constant temperature characteristics of boiling liquid helium. The pump is designed for a pumping speed of 32,000 1/s. Extensive testing was-performed with a prototypical pump test fixture. Several pump geometries (simple tube, coaxial flow plug, and coaxial slotted insert) were tested, in an iterative process, to determine which was the most satisfactory for stable cryocondensation pumping. Results from the different tests illustrating the temperature distribution and flow characteristics for each configuration are presented.

Funders	Funder number
U.S. Department of Energy	DE-AC03-89ER51114, DE-AC05-84OR21400

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10.1016/S0011-2275(05)80082-7

Cite this

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title = "Two phase liquid helium flow testing to simulate the operation of a cryocondensation pump in the DIII-D tokamak",

abstract = "A liquid helium-cooled cryocondensation pump has been installed in the DIII=D tokamak fusion energy research experiment at General Atomics. The pump is located within the tokamak vacuum chamber beneath the divertor baffle plates and is utilized for plasma density and contamination control. Two-phase helium flows through the pump at 5 to 10 g/s utilizing the beat transfer and constant temperature characteristics of boiling liquid helium. The pump is designed for a pumping speed of 32,0001/s. Extensive testing was performed with a prototypical pump test fixture. Several pump geometries (simple tube, coaxial flow plug, and coaxial slotted insert) were tested, in an iterative process, to determine which was the most satisfactory for stable cryocondensation pumping. Results from the different tests illustrating the temperature distribution and flow characteristics for each configuration are presented.",

author = "Laughon, {G. J.} and Baxi, {C. B.} and Campbell, {G. L.} and Mahdavi, {M. A.} and Makariou, {C. C.} and Menon, {M. M.} and Smith, {J. P.} and Schaffer, {M. J.} and Schaubel, {K. M.}",

year = "1994",

doi = "10.1016/S0011-2275(05)80082-7",

language = "English",

volume = "34",

pages = "365--368",

journal = "Cryogenics",

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T1 - Two phase liquid helium flow testing to simulate the operation of a cryocondensation pump in the DIII-D tokamak

AU - Laughon, G. J.

AU - Baxi, C. B.

AU - Campbell, G. L.

AU - Mahdavi, M. A.

AU - Makariou, C. C.

AU - Menon, M. M.

AU - Smith, J. P.

AU - Schaffer, M. J.

AU - Schaubel, K. M.

PY - 1994

Y1 - 1994

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AB - A liquid helium-cooled cryocondensation pump has been installed in the DIII=D tokamak fusion energy research experiment at General Atomics. The pump is located within the tokamak vacuum chamber beneath the divertor baffle plates and is utilized for plasma density and contamination control. Two-phase helium flows through the pump at 5 to 10 g/s utilizing the beat transfer and constant temperature characteristics of boiling liquid helium. The pump is designed for a pumping speed of 32,0001/s. Extensive testing was performed with a prototypical pump test fixture. Several pump geometries (simple tube, coaxial flow plug, and coaxial slotted insert) were tested, in an iterative process, to determine which was the most satisfactory for stable cryocondensation pumping. Results from the different tests illustrating the temperature distribution and flow characteristics for each configuration are presented.

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Two phase liquid helium flow testing to simulate the operation of a cryocondensation pump in the DIII-D tokamak

Abstract

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