TSTA compound cryopump
The Tritium System Test Assembly (TSTA), at the Los Alamos Scientific Laboratory, is intended to demonstrate realistic fuel supply and cleanup scenarios for future fusion reactors. The vacuum pumps must be capable of handling large quantities of reactor exhaust gases consisting largely of mixtures of hydrogen and helium isotopes. Cryocondensing pumps will not pump helium at 4.2 K; while cryosorption pumps using molecular sieves or charcoal have good helium pumping speed, the adsorbent clogs with condensed hydrogen while pumping mixtures of both. A solution to this problem is a compound design whereby the first stage condenses the hydrogen and the second, or sorption, stage pumps the helium. The TSTA pump designed at Lawrence Livermore National Laboratory uses argon gas to cryotrap the helium in the helium-hydrogen mixture. The argon is sprayed directly onto the 4.2 K surface at a rate proportional to the helium flow rate, permitting continuous pumping of the helium-hydrogen mixtures in a single-stage pump. However, the possibility of differential desorption as a first stage in the TSTA gas separation cycle required the inclusion of a first-stage hydrogen isotope condenser. The design, performance, and operating characteristics are discussed.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore National Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5176096
- Report Number(s):
- UCRL-84456; CONF-801037-2; TRN: 80-015131
- Resource Relation:
- Conference: American Vacuum Society conference, Detroit, MI, USA, 13 Oct 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CRYOPUMPS
DESIGN
CLEANING
OPERATION
PERFORMANCE
REACTOR FUELING
TEST FACILITIES
TRITIUM
TRITIUM RECOVERY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
HYDROGEN ISOTOPES
ISOTOPES
LABORATORY EQUIPMENT
LIGHT NUCLEI
NUCLEI
ODD-EVEN NUCLEI
PUMPS
RADIOISOTOPES
RECOVERY
VACUUM PUMPS
YEARS LIVING RADIOISOTOPES
700209* - Fusion Power Plant Technology- Component Development & Materials Testing
700206 - Fusion Power Plant Technology- Environmental Aspects