Design and preliminary tests of the liquid helium cooled MFTF cryopumping system

Journal Article · Wed Apr 01 04:00:00 EST 1981 · J. Vac. Sci. Technol.; (United States)

DOI:https://doi.org/10.1116/1.570857· OSTI ID:6496325

Thibault, J J; Disdier, J M; Arnaud, G; Boissin, J C; Hood, C B

The Mirror Fusion Test Facility at Lawrence Livermore Laboratory will contain three distinct cryopumping systems: (1) A large internal cryoarray to pump deuterium at pressures from 10/sup -5/ to 10/sup -8/ Torr. The array, cooled with liquid helium to 4.35/sup 0/, has a total surface area of 1100 m/sup 2/. (2) External regeneration pumps for initial pumpdown of the chamber and for removal of up to 9 x 10/sup 5/ Torr l of deuterium after warm-up of the internal array. These pumps are liquid helium cooled and operate between 0.6 and 10/sup -6/ Torr. (3) External cryosorption pumps for scavenging helium and hydrogen deuteride at partial pressures as low as 2 x 10/sup -9/ Torr. Utilizing adsorption on argon, these pumps operate at 2.7 K. All these systems are described and test data on the regeneration and cryosorption pumps are presented. Initial tests have demonstrated the ability of the regeneration pumps to perform in the 10/sup -1/ Torr range (2 x 10/sup 4/ l s/sup -1/ for N/sub 2/ at 0.15 Torr) and the cryosorption pumps to absorb helium at very low pressure (6000 l s/sup -1/ at 2 x 10/sup -9/ Torr for each pump) where practical data has not yet been published.

• Research Organization: L'Air Liquide, Division Technique Avancees, Sassenage, France
• OSTI ID: 6496325
• Journal Information: J. Vac. Sci. Technol.; (United States), Journal Name: J. Vac. Sci. Technol.; (United States) Vol. 18:3; ISSN JVSTA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
CRYOPUMPS
DESIGN
DEUTERIUM
EQUIPMENT
HIGH VACUUM
HYDROGEN ISOTOPES
ISOTOPES
LABORATORY EQUIPMENT
LIGHT NUCLEI
MAGNETIC MIRRORS
MFTF DEVICES
NUCLEI
ODD-ODD NUCLEI
OPEN PLASMA DEVICES
PUMPS
STABLE ISOTOPES
TESTING
THERMONUCLEAR DEVICES
ULTRAHIGH VACUUM
ULTRALOW TEMPERATURE
VACUUM PUMPS