DT results of TFTR`s alpha collector

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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 ... continued below

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30 p.

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Herrmann, H.W.; Zweben, S.J.; Darrow, D.S.; Timberlake, J.R.; Chong, G.P.; Haasz, A.A. et al. November 1, 1996.

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Description

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.

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30 p.

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Also available from the following url: http://www.pppl.gov. See PPPL reports section for full text.; OSTI as DE97050300

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  • Other Information: PBD: [1996]

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  • Other: DE97050300
  • Report No.: PPPL--3214
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/304168 | External Link
  • Office of Scientific & Technical Information Report Number: 304168
  • Archival Resource Key: ark:/67531/metadc676740

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  • November 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 3, 2016, 8:58 p.m.

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Herrmann, H.W.; Zweben, S.J.; Darrow, D.S.; Timberlake, J.R.; Chong, G.P.; Haasz, A.A. et al. DT results of TFTR`s alpha collector, report, November 1, 1996; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc676740/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.