Radiation-induced degassing of cryopumps
The pressure-gauge response of the system to the TRIGA pulses is shown. With an unloaded cryopump, an apparent pressure pulse is produced which is only slightly longer than the reactor pulse itself. In separate experiments, it was found that a similarly appearing pulse is produced by a completely sealed-off vacuum gauge. With a deuterium-loaded cryopump, a very much larger pressure pulse was produced, which had a long exponential tail, characteristic of a re-pumpdown of the system. The pumping speed, as computed from the exponential, is about half that observed previously when the cryopump was subjected to D/sub 2/-gas pulses, in the absense of radiation. Additional experiments were run with the core of the reactor retracted somewhat into the pool, in order to change the mix of gamma rays, thermal neutrons, and fast neutrons so as to preferentially depress the latter.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6848940
- Report Number(s):
- LBL-7941; CONF-781105-18; TRN: 79-001690
- Resource Relation:
- Conference: ANS meeting, Washington, DC, USA, 12 Nov 1978
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cryopump measurements relating to safety, pumping speed, and radiation outgassing
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Related Subjects
CRYOPUMPS
DEGASSING
GAMMA RADIATION
NEUTRAL BEAM SOURCES
NEUTRON REACTIONS
VACUUM SYSTEMS
BARYON REACTIONS
ELECTROMAGNETIC RADIATION
HADRON REACTIONS
IONIZING RADIATIONS
LABORATORY EQUIPMENT
NUCLEAR REACTIONS
NUCLEON REACTIONS
PUMPS
RADIATIONS
VACUUM PUMPS
700209* - Fusion Power Plant Technology- Component Development & Materials Testing