Tritium production in He-3 gas cells immersed in the Tokamak Fusion Test Reactor neutron field
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
- University of California, Los Angeles, California 90024 (United States)
Tritium generated in an external cell by the reaction {sup 3}He(n,p)T can be used as a gauge of long-term fusion neutron production, because of the 12-year half-life of T and the relative ease of measuring the T content either by sampling or from the saturation current of the cell when operated as an ionization chamber. Two high-pressure {sup 3}He gas cells enclosed in polyethylene neutron moderators were exposed to Tokamak Fusion Test Reactor (TFTR) neutrons during high-power D{endash}T operation. The tritium produced in the cells was assayed by the Princeton Differential Atmospheric Tritium Sampler. The measured tritium generated per 10{sup 19} fusion neutrons was 510 pCi/cc at 2.3 m from the TFTR vessel and 1.3 m below the midplane, and 2020 pCi/cc at 1.0 m from the TFTR vessel in the midplane. Combining these results with previous measurements at a third location, we found 0.11 to 0.23 triton produced per neutron incident on the projected cell cross section, with an asymptotic local tritium breeding ratio of 0.32. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 295683
- Report Number(s):
- CONF-980605--
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 70; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
Similar Records
Absolute calibration of TFTR helium proportional counters (abstract)[sup a]
Absolute calibration of TFTR helium proportional counters