Supported by Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U Niigata U Tsukuba U U Tokyo Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec E.J. Synakowski, M. Redi, D. Stutman 1 , K. Tritz 1 , M.G. Bell, R.E. Bell, W. Dorland 2 , M. Finkenthal 1 , K.W. Hill, S.M. Kaye, B.P. LeBlanc, N. Luhmann 3 , J.E. Menard, H. Park, S. Sabbagh 4 , D. Smith Princeton Plasma Physics Laboratory [1] Johns Hopkins University [2] University of Maryland, College Park [3] U.C. Davis [4] Columbia University An overview of electron thermal transport results from NSTX
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An overview of electron thermal transport results from NSTX
Supported by. Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics NYU ORNL PPPL PSI SNL UC Davis UC Irvine UCLA UCSD U Maryland U New Mexico U Rochester U Washington U Wisconsin Culham Sci Ctr Hiroshima U HIST Kyushu Tokai U - PowerPoint PPT Presentation
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Supported by
Columbia UComp-X
General AtomicsINEL
Johns Hopkins ULANLLLNL
LodestarMIT
Nova PhotonicsNYU
ORNLPPPL
PSISNL
UC DavisUC Irvine
UCLAUCSD
U MarylandU New Mexico
U RochesterU Washington
U WisconsinCulham Sci Ctr
Hiroshima UHIST
Kyushu Tokai UNiigata U
Tsukuba UU TokyoIoffe Inst
TRINITIKBSI
KAISTENEA, Frascati
CEA, CadaracheIPP, Jülich
IPP, GarchingU Quebec
E.J. Synakowski, M. Redi, D. Stutman1, K. Tritz1, M.G. Bell, R.E. Bell, W. Dorland2, M. Finkenthal1, K.W. Hill, S.M. Kaye, B.P. LeBlanc, N. Luhmann3, J.E. Menard, H. Park, S. Sabbagh4, D. Smith
Princeton Plasma Physics Laboratory[1] Johns Hopkins University[2] University of Maryland, College Park[3] U.C. Davis[4] Columbia University
TTF 2005, Napa, California
An overview of electron thermal transport results from NSTX
Synakowski, TTF Napa 2005
Electron thermal transport is emerging as a major focus for NSTX transport research
• Background – The electron channel typically dominates thermal conduction on
NSTX in H and L mode e can be changed via current profile changes
• New capabilities– ∆Te measurement capability reveals rapid responses to edge
perturbations
• Theory chimes in– GS2, paleoclassical
Synakowski, TTF Napa 2005
High ne, t H-mode: Ti, Te,and calculated heating profiles reveal dominance of electron thermal conduction
• Ti > Te although beams predominantly heat electrons
• No strong core MHD activity observed. Type-I ELMs at ≈ 50 Hz
7 MW H-Mode (t ≈ 25%,≈ y
R (cm)
2468
ne (1013 cm-3)
40 80 120 160
0.4
0.8
1.2
R0
Te Ti
40 80 120 160R (cm)
T (keV)
V
V(km/s)
50
100
150
200
250
electron heating1
00 0.5 1
r/a
ion heating
q
w/cm-3
Synakowski, TTF Napa 2005
Power balance reveals rapid electron thermal transport with ions near neoclassical predictions
7 MW NB H-Mode
e
iNC
i
(m2/s)
1
10
100
0.40.2 0.6 0.8r/a
20 msvariability
112596a04
(similar plasma as 112596)
For r/a < 0.4: very small gradients, large calculated heat deposition ==> large values. Also, only weak candidate instabilities identified in this region.
Synakowski, TTF Napa 2005
Two candidates for driving electron thermal flux in STs emerge in nonlinear GS2 calculations