DT results of TFTR`s alpha collector
- Princeton Univ., NJ (United States). Princeton Plasma Physics Lab.
- Univ. of Toronto, Downsview, Ontario (Canada). Inst. for Aerospace Studies
- Max-Planck-Inst. fuer Plasmaphysik, Garching (Germany)
- McMaster Univ., Hamilton, Ontario (Canada). Dept. of Engineering Physics
An escaping alpha collector probe has been developed for TFTR`s DT phase to complement the results of the lost alpha scintillator detectors which have been operating on TFTR since 1988. Measurements of the energy distribution of escaping alphas have been made by measuring the range of alphas implanted into nickel foils located within the alpha collector. Exposed samples have been analyzed for 4 DT plasma discharges at plasma currents of 1.0 and 1.8 MA. The results at 1.0 MA are in good agreement with predictions for first orbit alpha loss at 3.5 MeV. The 1.8 MA results, however, indicate a large anomalous loss of partially thermalized alphas at an energy {approximately}30% below the birth energy and at a total fluence nearly an order of magnitude above expected first orbit loss. This anomalous loss is not observed with the lost alpha scintillator detectors in DT plasmas but does resemble the anomalous delayed loss seen in DD plasmas. Several potential explanations for this loss process are examined. None of the candidate explanations proposed thus far are fully consistent with the anomalous loss observations.
- Research Organization:
- Princeton Univ., Princeton Plasma Physics Lab., NJ (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 304168
- Report Number(s):
- PPPL--3214; ON: DE97050300
- Country of Publication:
- United States
- Language:
- English
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