DIII-D Experiments and Modeling of Core Confinement in Quiescent Double Barrier Plasmas.

Casper, T. A. ; Burrell, K. H. ; Doyle, E. J. ; Gohil, P. ; Greenfield, C. M. ; Groebner, R. J.

Technical Information Center Oak Ridge Tennessee

关键词: Doublet-3 Device;    Plasma confinement;    Beam currents;    Carbon;    Copper;   

RP-ID  :  DE200415009740

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We continue to explore Quiescent Double Barrier (QDB) operation on DIII-D to address issues of critical importance to internal transport barrier (ITB) plasmas. QDB plasmas exhibit both a core transport barrier and a quiescent, H-mode edge barrier. Both experiments and modeling of these plasmas are leading to an increased understanding of this regime and it's potential advantages for advanced-tokamak (AT) burning-plasma operation. These near steady plasma conditions have been maintained on DIII-D for up to 4s, times greater than 35(tau)(sub E), and exhibit high performance with (beta)(sub N) > 2.5 and neutron production rates S(sub n) (approx.) 1 x 10(sup 16)s(sup -1). Recent experiments have been directed at exploring both the current profile modification effects of electron cyclotron current drive (ECCD) and electron cyclotron (ECH) heating-induced changes in temperature, density and impurity profiles.