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NSTX-U. Supported by . Macroscopic Stability (MS) Research Progress and Plans. Jong-Kyu Park (PPPL) J. W. Berkery (Columbia University) A. H. Boozer (Columbia University) and the NSTX Research Team. Coll of Wm & Mary Columbia U CompX General Atomics FIU INL Johns Hopkins U LANL

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  1. NSTX-U Supported by Macroscopic Stability (MS) Research Progress and Plans Jong-Kyu Park (PPPL) J. W. Berkery (Columbia University) A. H. Boozer (Columbia University) and the NSTX Research Team Coll of Wm & Mary Columbia U CompX General Atomics FIU INL Johns Hopkins U LANL LLNL Lodestar MIT Lehigh U Nova Photonics ORNL PPPL Princeton U Purdue U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado U Illinois U Maryland U Rochester U Tennessee U Tulsa U Washington U Wisconsin X Science LLC Culham Sci Ctr York U Chubu U Fukui U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu Tokai U NIFS Niigata U U Tokyo JAEA Inst for Nucl Res, Kiev Ioffe Inst TRINITI Chonbuk Natl U NFRI KAIST POSTECH Seoul Natl U ASIPP CIEMAT FOM Inst DIFFER ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep NSTX-U MS TSG discussion B252, PPPL July 13, 2012

  2. Discussion for MS chapter in NSTX-U Five-year plan • First need to develop very clear thrusts • Need to reshuffle plans under each thrust, to modify and improve chapter outline • Define a draft list of lead and co-authors for each chapter for writing • Complete the draft time-line for MS chapter

  3. Thrusts for MS research • Presently we have • Beta and profile control support, expected impact on stability • Error field identification and control • RWM – passive stability and active control • NTV: 3D field effects on equilibrium, transport, turbulence, etc • Disruption physics, detection, and mitigation • Need more definitive thrusts. Possibly, • For stability physics and control (Steve, Jack?) • For 3D field physics (JK, Boozer, Menard?) • For disruption detection and mitigation (Stefan, Roger?)

  4. Plans related to stability and control • Year 1 • Recover and explore NSTX MS control capabilities • Assess the βN or q limit with new shaping control and off-axis NBCD • Recover and upgrade RWM Bp+Brand state space control with SPAs, including n>1 and multi-mode control • Year 2 • Validate RWM physics in reduced ν* and varied fast ion populations • Utilize off-axis NBCD to vary q-profile and applies to RWMs and tearing modes • Year 3 • Optimize rotation feedback control for improving RWM and TM stability • Assess and optimize tradeoffs between q, rotation, β to improve stability • Explore the lowest ν* regimes and optimize RWM and TM stability • Year 4 • Combine rotation and β feedback control to maximize performance • Provide FNSF/Pilot projection on RWM and TM stability and disruption • Year 5 • Integrate MS control to avoid RWM, TM, ELM instability, disruption, with disruption mitigation protection • Integrate validation of models for FSNF/Pilot

  5. Plans related to 3D field physics • Year 1 • Recover and explore NSTX MS control capabilities • Identify n=1,2,3 error fields and optimize corrections with new SPAs • Year 2 • Explore NTV physics with new NBIs and SPAs • Begin implementation of rotation control with new NBIs and SPAs • Year 3 • Optimize rotation feedback control for improving RWM and TM stability • Assess and optimize tradeoffs between q, rotation, β to improve stability • Year 4 • Combine rotation and β feedback control to maximize performance • Year 5 • First use of NCC (if resources permitting) • Integrate MS control to avoid RWM, TM, ELM instability, disruption, with disruption mitigation protection • Integrate validation of models for FSNF/Pilot

  6. Plans related disruption detection and mitigation • Year 1 • Revisit disruptivity and study halo current dynamics and heat loads on divertor • Apply MGI mitigation and explore dependency on injection locations • Year 2 • Identify disruption characteristics in various scenarios obtained by off-axis NBCD • Test and optimize MGI techniques by varying positions and actuators • Year 3 • Explore disruption precursors and avoidance scenarios with various MHD origins • Explore MGI triggering for real-time actuation for disruption mitigation • Year 4 • Provide FNSF/Pilot projection on RWM and TM stability and disruption • Couple MGI triggering techniques to mitigate disruptions • Year 5 • Integrate MS control to avoid RWM, TM, ELM instability, disruption, with disruption mitigation protection • Integrate validation of models for FSNF/Pilot

  7. Theory/Simulation/Diagnostics • For theory and simulation, presently we have only • VALEN • IPEC • … • Key diagnostics, presently we have (Presented in PAC 31) • Real-Time Velocity measurement • Toroidally displaced MESXR • Core X-ray imaging spectrometer • Internal magnetic fluctuation measurement • Real-Time MSE and MPTS • Refurbishment of magnetic sensors including Bp and Br

  8. Non-axisymmetric Control Coil (NCC) • Need to do the actual analysis on • Rotation control (NTV) • RWM active control (VALEN3D, done for NSTX) • RWM kinetic stabilization (MISK) • Error Field Correction (IPEC) • ELM control and stabilization (TRIP3D is done for NSTX) • Simultaneous control • Prediction for ITER 3D coil capabilities • Need to launch NCC coil design activities? • Set up coil geometries (for instance, 2 options from Steve) • Set up NSTX-U targets (a couple of targets from Stefan) • Analysis plans (codes, responsible persons) • IPEC (JK), NTV (Kimin), RWM dWk (Jack), TRIP3D (YS), VALEN3D (Jim), etc?

  9. Summarized theory topics in MS

  10. Important diagnostics for MS topics were identified and will be under proposal and/or development

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