Observation of particle transport barriers in reverse shear plasmas on the Tokamak Fusion Test Reactor

被引:22
作者
Efthimion, PC [1 ]
von Goeler, S
Houlberg, WA
Synakowski, EJ
Zarnstorff, MC
Batha, SH
Bell, RE
Bitter, M
Bush, CE
Levinton, FM
Mazzucato, E
McCune, D
Mueller, D
Park, H
Ramsey, AT
Roquemore, AL
Taylor, G
机构
[1] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[2] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA
[3] Fus Phys & Technol, Torrance, CA 90503 USA
关键词
D O I
10.1063/1.872853
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Perturbative experiments on the Tokamak Fusion Test Reactor [Phys. Plasmas 4, 1736 (1997)] (TFTR) have investigated transport in reverse shear plasmas. On TFTR, reverse magnetic shear plasmas bifurcate into two states with different transport properties: reverse shear (RS) and enhanced reverse shear (ERS) with improved core confinement. Measurements of the 14 MeV t(d,n)alpha neutrons and charge-exchange recombination radiation spectra are used to infer the trace tritium and helium profiles, respectively. The profile evolution indicate the formation of core particle transport barriers in ERS plasmas. The transport barrier is manifested by an order-of-magnitude reduction in the particle diffusivity (D-T,D-He) and a smaller reduction in the pinch within the reverse shear region. The low diffusivities are consistent with neoclassical predictions. Furthermore, D-T and D(He)approximate to chi(eff), the effective thermal diffusivity. Although the measured coefficients imply no helium ash accumulation, the situation is uncertain in a reactor due to unknown chi(eff) scaling.
引用
收藏
页码:1832 / 1838
页数:7
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