Isotopic scaling of confinement in deuterium--tritium plasmas

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871253· OSTI ID:55895

Scott, S D; Zarnstorff, M C; Barnes, C W; Bell, R; Bretz, N L; Bush, C; Chang, Z; Ernst, D; Fonck, R J; Johnson, L; Mazzucato, E; Nazikian, R; Paul, S; Schivell, J; Synakowski, E J; Adler, H; Bell, M; Budny, R; Fredrickson, E; Grek, B ; Janos, A; Johnson, D; McCune, D; Park, H; Ramsey, A; Redi, M H; Taylor, G; Thompson, M; Wieland, R ^[1]

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1. Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)

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 {bold 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 {tau}{sub {ital E}}{proportional_to}{l_angle}{ital A}{r_angle}{sup 0.85{plus_minus}0.20}, {tau}{sub {ital E}}{sup thermal}{proportional_to}{l_angle}{ital A}{r_angle}{sup 0.89{plus_minus}0.20}, {chi}{sub {ital i}}{sup tot}{proportional_to}{l_angle}{ital A}{r_angle}{sup {minus}2.6{plus_minus}0.5}, and {ital D}{sub {ital e}}{proportional_to}{l_angle}{ital A}{r_angle}{sup {minus}1.4{plus_minus}0.2} at fixed {ital P}{sub inj}. For fixed local plasma parameters {chi}{sub {ital i}}{sup tot}{proportional_to}{l_angle}{ital A}{r_angle}{sup {minus}1.8{plus_minus}0.4} is obtained. The quoted 2{sigma} 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.

• Research Organization: Princeton Plasma Physics Laboratory
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 55895
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION HEATING
DEUTERIUM
NEUTRON EMISSION
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
SCALING LAWS
TFTR TOKAMAK
THERMONUCLEAR DEVICES
TRITIUM