Steady State Discharge Modeling for KSTAR

1
Steady State Discharge Modeling for KSTAR

• C. Kessel
• Princeton Plasma Physics Laboratory
• US-Korea Workshop - KSTAR Collaborations,
  5/19-20/2004

2
Integrated Simulations Combined with Stand-alone
Analysis for KSTAR

• Develop steady state advanced scenario
  simulations
• Magnetics/position, shape, current reconstruction
  and control
• Auxiliary heating/CD systems ---gt models and
  control
• MHD stability and control
• Profile evolution ----gt setup and control
• Perturbations simulations to examine energy,
  particle, current transport responses and control
• Utilize sophisticated physics models for
  benchmarks
• Determine response to installed powers, and help
  plan upgrade sequences

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3
KSTAR Can Benefit From and Provide Feedback for
Fusion Simulation Efforts
Experiments (constraints on theory, and
practical constraints on
assumptions, B.C.s, includes
expansion of interpretation tools)
Standardized integrated modeling tool(s) for
predictive and interpretive simulations
Integrated Simulation (fast enough for
parametrics)
Sophisticated Physics Modeling (stand
alone, physics topical specific, algorithms
judged against versatility and comp.
speed)
4
Several Aspects to Integrated Simulations -- What
is most critical for KSTAR?
More physics models in the integrated
simulations More sophisticated (more
accurate/detailed) models in the integrated
simulations More experimental benchmarks/verifica
tions of individual physics models and integrated
simulations which use those models More
benchmarks between integrated simulations physics
models and stand-alone sophisticated physics
models Development of faster or more versatile
physics models Improvement of integrated
simulation core/interface/data tools Establish
simultaneous Near term goals Mid term goals Long
term goals
5
KSTAR Has Unique Capabilities That Make for a
Complex Research Plan
DIII-D like, C-Mod like, and ITER like
AT-modes NTM RWM onset and stabilization or
avoidance Impurity control for power
handling Non-solenoidal current rampup Global
control strategies for shape, density, stored
energy, current profile, transport, and
disruption avoidance Impact of nonlinear n, T,
and j transport profile responses
4 sources (NBI, LH, EC, ICRF) Strong
shaping Long pulse Divertor/pumping Present-day
diagnostics
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Proposal
Free-boundary integrated discharge simulations of
KSTAR advanced tokamak operating scenarios 0D
systems analysis to identify viable
power-CD-stored energy solutions ---gt including
engineering constraints (power handling,
etc.) Tokamak simulation code coupled with
required modules Stand-alone analyses as required
(more sophisticated physics models) Examine Phase
I (20 s) operating space Examine Phase II (300 s)
operating space ---gt Identify CD limitations,
auxiliary system power requirements and plasma
operating parameters (n, Ip, BT, etc.) of
self-consistent configurations ---gt Examine
controllability of current profile, plasma shape,
and stored energy simultaneously ---gt Identify
best auxiliary system upgrade choices and impact
of uncertainties on performance (transport,
density control, etc.) Modest funding -----gt
analysis with existing computational
tools Increased funding -----gt more extensive
integrated modeling tool development KSTARs
near term operation can serve as guide and test
bed for SciDAC and FSP efforts, as well as NSTX,
DIII-D and C-Mod modeling
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Proposal
1st plasma
upgrade start
20 s
initial operation
baseline operation
04
07
08
09
10
11
06
05
Integrated modeling effort for 20 s baseline
operation, with some modeling for 300 s

• Extensive interpretive modeling and predictive
  model (300s) development/correction from expts
  results
• high performance
• Long pulse, high fNI
• AT modes
• Advanced control

What should we be doing now??