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

DE200415009740

Publication Date	2003
Personal Author	Casper, T. A.; Burrell, K. H.; Doyle, E. J.; Gohil, P.; Greenfield, C. M.; Groebner, R. J.
Page Count	14
Abstract	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.
Keywords	Doublet-3 Device Plasma confinement Beam currents Carbon Copper Cyclotrons Electrons Heating Impurities Modifications Neutrons Nickel Simulation Transport Non-inductive current drive
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200515

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

DIII-D Experiments and Modeling of Core Confinement in Quiescent Double Barrier Plasmas.
DE200415009740

Publication Date	2003
Personal Author	Casper, T. A.; Burrell, K. H.; Doyle, E. J.; Gohil, P.; Greenfield, C. M.; Groebner, R. J.
Page Count	14
Abstract	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.
Keywords	Doublet-3 Device Plasma confinement Beam currents Carbon Copper Cyclotrons Electrons Heating Impurities Modifications Neutrons Nickel Simulation Transport Non-inductive current drive
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200515