NSTX WZ – XP524 - NSTX Results Review ‘05 Supported by Office of Science 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 JAERI Ioffe Inst TRINITI KBSI KAIST ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching U Quebec XP524: Physics and Control of Toroidal Rotation Damping in NSTX W. Zhu 1 , S.A. Sabbagh 1 , A.C. Sontag 1 , J. Bialek 1 , R.E. Bell 2 , J.E. Menard 2 , D.A. Gates 2 , C.C. Hegna 3 , B.P. LeBlanc 2 , K.C. Shaing 3 , D. Battaglia 3 , and the NSTX Research Team 1 Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 2 Plasma Physics Laboratory, Princeton University, Princeton, NJ 3 University of Wisconsin, Madison, WI v1.0 NSTX Results Review December 12th, 2005 Princeton Plasma Physics Laboratory
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NSTX WZ – XP524 - NSTX Results Review ‘05
Supported byOffice ofScience
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 Tokyo
JAERIIoffe Inst
TRINITIKBSI
KAISTENEA, Frascati
CEA, CadaracheIPP, Jülich
IPP, GarchingU Quebec
XP524: Physics and Control of Toroidal Rotation Damping in NSTX
W. Zhu1, S.A. Sabbagh1, A.C. Sontag1, J. Bialek1, R.E. Bell2, J.E. Menard2, D.A. Gates2, C.C. Hegna3, B.P. LeBlanc2, K.C. Shaing3,
D. Battaglia3, and the NSTX Research Team
1Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY2Plasma Physics Laboratory, Princeton University, Princeton, NJ3University of Wisconsin, Madison, WI
v1.0
NSTX Results ReviewDecember 12th, 2005
Princeton Plasma Physics Laboratory
NSTX WZ – XP524 - NSTX Results Review ‘05
Produce low rotation (ITER relevant) target plasmas
Good control by current timing / magnitude
Study physics of plasma rotation damping due to applied field / RWM
n=1 and n=3 fields used
6 ex-vessel non-axisymmetric field coils
6
4
2
0
3
2
1
0
N
IR
WM(kA
)
0.4
0.3
0.2
0.1
0.00.4
0.3
0.2
0.1
0.0
V/
VA
V/
VA
Core region
Edge region
116924116930116931
0.0 0.2 0.4 0.6 0.8
Time (s)
n=3 DC field pulse
R=1.08m
R=1.30m
Non-axisymmetric fields used to study plasma rotation damping
NSTX WZ – XP524 - NSTX Results Review ‘05
Attention placed on studying non-resonant rotation damping physics
Non-resonant Global profile
control by pulsing the applied field
Resonant Local JxB
torque can explain damping by tearing modes
Outward momentum transfer across rational surface
Leads to rigid rotor core
0.9 1.0 1.1 1.2 1.3 1.4 1.5R (m)
40
30
20
10
040
30
20
10
0
Ft
(kH
z)F
t (k
Hz)
Spin-down
Spin-up !
116937
Time (s)0.345s0.355s0.365s0.375s0.385s
Time (s)0.405s0.415s0.425s0.435s
0.9 1.0 1.1 1.2 1.3 1.4 1.5R (m)
40
30
20
10
0F
t (k
Hz)
10
0
-10
-20
-30
Ft (kH
z)
116190
Time (s)0.345s0.355s0.365s
Time (s)0.345-0.355s0.355-0.365s
n = 1 tearing mode
resonant dampingnon-resonant damping
q = 2
NSTX WZ – XP524 - NSTX Results Review ‘05
Neoclassical toroidal viscosity (NTV) theory tested as non-resonant damping mechanism