Isotopic scaling of confinement in deuterium-tritium plasmas

S. D. Scott, M. C. Zarnstorff, Cris W. Barnes, R. Bell, N. L. Bretz, C. Bush, Z. Chang, D. Ernst, R. J. Fonck, L. Johnson, E. Mazzucato, R. Nazikian, S. Paul, J. Schivell, E. J. Synakowski, H. Adler, M. Bell, R. Budny, E. Fredrickson, B. GrekA. Janos, D. Johnson, D. McCune, H. Park, A. Ramsey, M. H. Redi, G. Taylor, M. Thompson, R. Wieland

Research output: Contribution to journalArticlepeer-review


The confinement and heating of supershot plasmas are significantly enhanced with tritium beam injection relative to deuterium injection in the Tokamak Fusion Test Reactor [Plasma Phys. Controlled Fusion 26, 11 (1984)]. The global energy confinement and local thermal transport are analyzed for deuterium and tritium fueled plasmas to quantify their dependence on the average mass of the hydrogenic ions. Radial profiles of the deuterium and tritium densities are determined from the D-T fusion neutron emission profile. The inferred scalings with average isotopic mass are quite strong, with τE∝〈 A〉0.85±0.20, τEthermal ∝ 〈A〉0.89±0.20, χitot ∝ 〈A〉-2.6±0.5, and De∝〈A〉 -1.4±0.2 at fixed Pinj. For fixed local plasma parameters χitot ∝ 〈A〉 -1.8±0.4 is obtained. The quoted 2σ uncertainties include contributions from both diagnostic errors and shot irreproducibility, and are conservatively constructed to attribute the entire scatter in the regressed parameters to uncertainties in the exponent on plasma mass.

Original languageEnglish
Pages (from-to)2299-2307
Number of pages9
JournalPhysics of Plasmas
Issue number6
StatePublished - 1995

ASJC Scopus subject areas

  • Condensed Matter Physics


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