1 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 PPPL Alcator C-Mod Ideas Forum December 2, 2004 The NSTX Research Program and Collaboration Opportunities
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The NSTX Research Program and Collaboration Opportunities
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. SynakowskiPPPL
Alcator C-Mod Ideas ForumDecember 2, 2004
The NSTX Research Program and Collaboration
Opportunities
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Theory-experiment
coupling
Experimentalcollaboration
Unique NSTX plasma properties provide scientific leverage in all major areas of toroidal confinement research
Core transport
& turbulenc
eMHD: stability & helicity injection
Wave/particle interactions
Strengthen the scientific basis for
fusion energy
Edge transport & stability
Test theory by isolating important physics and challenging models at their extremes of applicability
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Assess high low A physics with passive control
Strengthen physics basis with advanced
measurements & control at high &
low A
Optimize long-pulse, high
Strengthen physics
understanding
• Take maximal scientific advantage of ST plasma characteristics through novel diagnostics and new control tools, and targeted inter-device studies
focus for FY
‘05-‘07
NSTX research is entering a phase of advanced diagnostic implementation and advanced control
Innovative diagnostics
Control tools to test physics &
increase operating space
enablingInter-device
studies
scienceHigh impact onturbulence, waves, MHD
Unique edge B structureLarge super-
Alfvénic ni
High Vflow/VAlfvén
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• NBI + EBW CD.
• Mode control + rotation are key
• Fast ion transport & MHD important for understanding JNB
• Turbulence studies to form basis for confinement understanding
• Edge optimization & particle control required
• Successful HHFW w/ NBI ==> more JBS. Also
high value in NI-startup
40% T with ~100% INI, pulse >> skin, demands development of new tools and understanding their underlying physics
Kessel, TSCIAEA 2004
NBCD
bootstrap EBW
psi
bootstrap
NBCDEBW grad-pth
q(0)q(min)
Ongoing partnership with MIT
Common elements with error field & RWM research
Complementary *AE research with very different Vion/VAlfvén?
Build on joint edge studies, towards high k studies in the core.
Pedestal studies with very different edges. C-Mod originated Li studies at PPPL
Wave physics opportunity?
40% T , INI = 100%, pulse >> skin
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MHD & macroscopic plasma behavior
Passive stability limits & mode
characterization
C-Mod/NSTX opportunities include
• Error field studies
• Fast ion physics
• Edge stability (discussed later)
Active feedback coils
Strong shapingenabling Helicity injection
Physics of active control
Expand operating space
scienceFlows
NTM physicsNonlinear fast
ion MHDDynamo physics
Optimize stability of high
Develop startup techniques
Deepen physics understanding of
stability & reconnection
Relevant physics attributes
• Strongly driven vs. low rotation (Vflow/VA
1 on NSTX)
• Vfast ion/VA > 1 always true on NSTX.
• Different means of generating fast ions
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Rotation effects are strong in NSTX plasmas
W. Park, J. Menard
Rotational shear also strong candidate for internal mode saturation
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Differences & similarities in plasma parameters may allow comparative studies in mode control & mode locking
• Compared to C-Mod,
– ~ similar sound speed, C-Mod has smaller VAlfvén. NSTX has Larger Vflow/Valfvén.
Implications for mode damping/locking?
– At lower A, higher n modes expected to be more important --> benchmark RWM theories
• Likely source of complementarity: error field and mode locking studies
• Contacts: myself, Jon Menard (this run’s run coordinator), ET leaders, Stan Kaye, Mike Bell– MHD: Steve Sabbagh, Dave Gates– Transport: Stan Kaye, Dan Stutman– Boundary: Bob Kaita, Jose Boedo– HHFW/EBW: Cynthia Phillips, Randy Wilson– Integrated scenarios: Rajesh Maingi, Chuck
Kessel
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There are many opportunities for additional, high leverage collaborative research
• A key aspect of our research approach is to use similarities & differences between different devices to challenge theories & models at their extremes
• Scientific progress is colinear with demonstrations of advanced scenarios
• Improved diagnostics and control capability will enable more sophisticated comparative studies this run
• We welcome this as part of a continuing constructive dialogue between the two programs
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FESAC Theme: Understand & control the processes that govern confinement of heat, momentum, and particles
FESAC Theme: Learn to use energetic particles & e-m waves to
sustain and control high temperature plasmas
FESAC Theme: Understand the role of magnetic structure on confinement, & plasma pressure limits
Microscopic ion, electron, and tearing turbulence measurement & theory comparison over wide range in , flows, and magnetic shear, with good average curvature and high trapping
Stability pressure limits & magnetic reconnection vs. A, shape, profile, q & flows, for internal & external modes with Vflow/VA < 0.4 & unity ; helicity transport
EM waves in overdense plasma; Phase space manipulation with high electron trapping; energetic ions with large orbits; Alfven eigenmodes and turbulence with Vfast/VA >> 1
FESAC Theme: Learn to control the interface
between a 100 million degree plasma and its
room temperature surroundings
Physics of ELMs, pedestal, SOL turbulence & high
divertor heat flux, with large in/out asymmetry; Li
coatings & liquid surface interactions with plasma.
NSTX research for ‘05 - ‘07 is well aligned with the fusion program’s scientific priorities and supports strategic goals
NSTX
_
Demonstrate Feasibility with Burning Plasmas
Develop Understanding and Predicitve Capability
Determine Most Promising Configurations
Develop New Materials, Components, & Technologies
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Plasma flows will be a focal point of research through ‘07
• Understanding momentum transport a national transport priority
• Motivated by observations– Counter-directed flow with co-
injection – V, V with HHFW & prior to
ohmic H modes
• Needed to reconstruct Er & profile
• V measurements deeper in the core will be developed for ‘06
R. Bell
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NSTX research led to an expansion of operating space in 2004
Reduced latency improved vertical control at high-, high-T
Capability for higher allowed higher IP/aBT
Significantly more high-T
(N=6.8 %mT/MA achieved)
More routine high Longer current flattop duration pulse = (>0.85 Ip,max)