1 / 4

Passive and Active Stability of Kink/RWM and Rotation Control in KSTAR-relevant Equilibria

NSTX. Supported by. Passive and Active Stability of Kink/RWM and Rotation Control in KSTAR-relevant Equilibria. College W&M Colorado Sch Mines Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI

nibal
Download Presentation

Passive and Active Stability of Kink/RWM and Rotation Control in KSTAR-relevant Equilibria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NSTX Supported by Passive and Active Stability of Kink/RWM and Rotation Control in KSTAR-relevant Equilibria College W&M Colorado Sch Mines Columbia U Comp-X General Atomics INEL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI Princeton U Purdue U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado U Maryland U Rochester U Washington U Wisconsin Culham Sci Ctr U St. Andrews York U Chubu U Fukui U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu Tokai U NIFS Niigata U U Tokyo JAEA Hebrew U Ioffe Inst RRC Kurchatov Inst TRINITI NFRI KAIST POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep U Quebec Y.S. Park, S.A. Sabbagh, J.M. Bialek, J.W. Berkery, O. Katsuro-Hopkins Department of Applied Physics, Columbia University, New York, NY, USA NSTX Research Forum December 1st, 2009 Princeton Plasma Physics Laboratory

  2. XP Supports NSTX-KSTAR Joint Experiment • Motivation • Verify suitability of the planned IVCC/passive plate design for RWM stabilization in KSTAR • Demonstrate rotation control by n=2 magnetic braking to determine an optimal rotation control strategy of KSTAR, i.e. counter-NBI vs. magnetic braking by IVCC • Possible large aspect ratio (AR) experiment under high bN of NSTX • Goals Prerequisite : Generate KSTAR-relevant lower q95 and k, higher AR equilibria • Stability threshold of Kink/RWM with various bN, li, wall-plasma gap distance • Active stabilization of RWM • Rotation control by n=2 magnetic braking • Contribution • Comparison of this XP to lower aspect ratio NSTX plasmas (possible q95 & AR effects) • Based on the NSTX-KSTAR joint experiment, support upcoming KSTAR high beta experiment by using KSTAR-relevant target equilibria • Possible support to several ITPA (MDC-2, MDC-12, MDC-4, MDC-14)

  3. KSTAR High Beta Experiment is Upcoming • Major KSTAR upgrade in the year 2010 for high beta experiment • IVCC, passive plates (4 toroidal segmented IVCC  n=2 field), divertor plates • First NBI & LHCD (Paux will be 3MW in 2010 and upgraded to 9.5MW until 2012) • PF power supply upgrade for double null & long pulse discharge • KSTAR achieved its goal of 2009 experimental campaign (2009 campaign during Oct.~ Nov. 2009 - 7 weeks) - 320kA, 3.6 sec discharge obtained (shot# 2048 on Nov. 18th 2009) • KSTAR IVCC to control plasma position & RWM/FEC/ELM (upper/middle/lower)

  4. Approach and Run Plan • Approach • Vacuum field analysis to compare the applied field spectrum of the two devices • Generate KSTAR-relevant target equilibria having following parameters (XP818) (bN = 2.5~5.0 or higher, li = 0.6~1.0, k = 2.0, q95 and AR closest to 4.0 and 3.6, respectively) • Passive Kink/RWM stability with bN, li, gap distance change • Demonstrate n=2 magnetic braking with various input torque from NBI and applied coil current • Run plan (1 day) • Target plasma development • n = 1 & 3 experiments : min. 8 shots • Kink/RWM stability threshold • RWM active feedback stabilization • Locked mode threshold • n = 2 experiments : min. 4 shots • Rotation control by magnetic braking • ELM dynamics investigation • NTM threshold or interference

More Related