Preliminary Results from XP1020 RFA Measurements

J.W. BerkeryDepartment of Applied Physics, Columbia University, New York, NY, USA

NSTX Monday Physics MeetingPPPL, Princeton, NJ

April 26th, 2010

NSTX Supported by

College W&MColorado Sch MinesColumbia UCompXGeneral AtomicsINLJohns Hopkins ULANLLLNLLodestarMITNova PhotonicsNew York UOld Dominion UORNLPPPLPSIPrinceton UPurdue USNLThink Tank, Inc.UC DavisUC IrvineUCLAUCSDU ColoradoU IllinoisU MarylandU RochesterU WashingtonU Wisconsin

Culham Sci CtrU St. Andrews

York UChubu UFukui U

Hiroshima UHyogo UKyoto U

Kyushu UKyushu Tokai U

NIFSNiigata UU Tokyo

JAEAHebrew UIoffe Inst

RRC Kurchatov InstTRINITI

KBSIKAIST

POSTECHASIPP

ENEA, FrascatiCEA, Cadarache

IPP, JülichIPP, Garching

ASCR, Czech RepU Quebec

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

• Half day on 4/15: – 24 shots– 16 with AC fields– 7 had enough cycles

before disruption for analysis (and Thomson)

– 3 long periods– 4 short

• RFA analysis code by S.P. Gerhardt

XP1020 RFA Analysis

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NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

XP1020 RFA analysis

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XP935

XP1020

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

XP1020 RFA analysis

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NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

XP1020 RFA analysis

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NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

βN = 3.5 comparison

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less stable – higher ωφ

more stable – lower ωφ

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

Evolution of RFA vs. time within a single shot, 137819

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(Note: βN and rotation are changing at the same time.)

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

Evolution of RFA vs. time within a single shot, 137816

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(Note: βN and rotation are changing at the same time.)

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010 9

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

Evolution of RFA vs. time within a single shot, 137825

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(Note: βN and rotation are changing at the same time.)

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

βN = 4.25 comparison

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NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

Evolution of RFA vs. time within a single shot, 133797

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(Note: βN and rotation are changing at the same time.)

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010

Evolution of RFA vs. time within a single shot, 133798

13

(Note: βN and rotation are changing at the same time.)

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010 14

NSTX XP1020 – RWM Physics (Berkery) April 26, 2010 15