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Title: TSTA compound cryopump

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore National Lab.
OSTI Identifier:
5176096
Report Number(s):
UCRL-84456; CONF-801037-2
TRN: 80-015131
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: American Vacuum Society conference, Detroit, MI, USA, 13 Oct 1980
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 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

Citation Formats

Batzer, T H, Patrick, R E, and Call, W R. TSTA compound cryopump. United States: N. p., 1980. Web.
Batzer, T H, Patrick, R E, & Call, W R. TSTA compound cryopump. United States.
Batzer, T H, Patrick, R E, and Call, W R. 1980. "TSTA compound cryopump". United States. https://www.osti.gov/servlets/purl/5176096.
@article{osti_5176096,
title = {TSTA compound cryopump},
author = {Batzer, T H and Patrick, R E and Call, W R},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5176096}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {8}
}

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