Simultaneous detection of neoclassical tearing mode and electron cyclotron current drive locations using electron cyclotron emission in DIII-D

Nelson, A. O.; La Haye, R. J.; Austin, M. E.; Welander, A. S.; Kolemen, E.

doi:10.1016/j.fusengdes.2019.02.089

Title: Simultaneous detection of neoclassical tearing mode and electron cyclotron current drive locations using electron cyclotron emission in DIII-D

Journal Article · 25 February 2019 · Fusion Engineering and Design

DOI: https://doi.org/10.1016/j.fusengdes.2019.02.089 · OSTI ID:1511826

^[1]; La Haye, R. J. ^[2]; Austin, M. E. ^[3]; Welander, A. S. ^[2]; Kolemen, E. ^[4]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Univ. of Texas, Austin, TX (United States)
Princeton Univ., NJ (United States)

Accurate real-time measurements of magnetic island and electron cyclotron current drive (ECCD) locations are essential for efficient suppression of the neoclassical tearing mode (NTM). To identify these locations, many control systems rely on motional Stark effect constrained equilibria reconstruction and real-time Thomson scattering with TORBEAM current drive evaluation and therefore require time-intensive cross-calibration of at least two different diagnostics. Here we present a simpler, proof-of-concept analysis that uses only a single diagnostic (a radial array electron cyclotron emission radiometer) for the simultaneous determination of both the radial position of a magnetic island and the deposition location of ECCD. Measurements are compared with the modified Rutherford equation to demonstrate the effect of ECCD alignment on NTM suppression.

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Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC52-07NA27344; FC02-04ER54698

OSTI ID:: 1511826

Journal Information:: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Journal Issue: C Vol. 141; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (26)

TORBEAM, a beam tracing code for electron-cyclotron waves in tokamak plasmas Poli, E.; Peeters, A. G.; Pereverzev, G. V. Computer Physics Communications, Vol. 136, Issue 1-2 https://doi.org/10.1016/S0010-4655(01)00146-1	journal	May 2001
Experiment and simulation of tearing mode evolution with electron cyclotron current drive in KSTAR Kim, Kyungjin; Na, Yong-Su; Kim, Minhwa Current Applied Physics, Vol. 15, Issue 4 https://doi.org/10.1016/j.cap.2015.01.032	journal	April 2015
Technological challenges of ITER diagnostics Costley, A. E.; Sugie, T.; Vayakis, G. Fusion Engineering and Design, Vol. 74, Issue 1-4 https://doi.org/10.1016/j.fusengdes.2005.08.026	journal	November 2005
Control of neoclassical tearing modes in DIII–D La Haye, R. J.; Günter, S.; Humphreys, D. A. Physics of Plasmas, Vol. 9, Issue 5 https://doi.org/10.1063/1.1456066	journal	May 2002
Electron cyclotron emission radiometer upgrade on the DIII-D tokamak Austin, M. E.; Lohr, J. Review of Scientific Instruments, Vol. 74, Issue 3 https://doi.org/10.1063/1.1530387	journal	March 2003
Heating and current drive by electron cyclotron waves Prater, R. Physics of Plasmas, Vol. 11, Issue 5 https://doi.org/10.1063/1.1690762	journal	May 2004
Neoclassical tearing modes and their control La Haye, R. J. Physics of Plasmas, Vol. 13, Issue 5 https://doi.org/10.1063/1.2180747	journal	May 2006
Overview of equilibrium reconstruction on DIII-D using new measurements from an expanded motional Stark effect diagnostic Holcomb, C. T.; Makowski, M. A.; Allen, S. L. Review of Scientific Instruments, Vol. 79, Issue 10 https://doi.org/10.1063/1.2955711	journal	October 2008
Advanced techniques for neoclassical tearing mode control in DIII-D Volpe, F. A. G.; Austin, M. E.; La Haye, R. J. Physics of Plasmas, Vol. 16, Issue 10 https://doi.org/10.1063/1.3232325	journal	October 2009
A frequency tunable, eight-channel correlation ECE system for electron temperature turbulence measurements on the DIII-D tokamak Sung, C.; Peebles, W. A.; Wannberg, C. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4961296	journal	August 2016
Neoclassical tearing modes in Tokamak Fusion Test Reactor experiments. I. Measurements of magnetic islands and Δ ^′ Chang, Z.; Fredrickson, E. D.; Batha, S. H. Physics of Plasmas, Vol. 5, Issue 4 https://doi.org/10.1063/1.872627	journal	April 1998
Dimensionless scaling of the critical beta for onset of a neoclassical tearing mode La Haye, R. J.; Buttery, R. J.; Guenter, S. Physics of Plasmas, Vol. 7, Issue 8 https://doi.org/10.1063/1.874199	journal	August 2000
Discharge improvement through control of neoclassical tearing modes by localized ECCD in DIII-D Prater, R.; Haye, R. J. La; Lohr, J. Nuclear Fusion, Vol. 43, Issue 10 https://doi.org/10.1088/0029-5515/43/10/014	journal	September 2003
Achievement of high fusion triple product, steady-state sustainment and real-time NTM stabilization in high- _p ELMy H-mode discharges in JT-60U Isayama, A.; Kamada, Y.; Hayashi, N. Nuclear Fusion, Vol. 43, Issue 10 https://doi.org/10.1088/0029-5515/43/10/031	journal	October 2003
The ECRH/ECCD system on Tore Supra, a major step towards continuous operation Lennholm, M.; Agarici, G.; Berger-By, G. Nuclear Fusion, Vol. 43, Issue 11 https://doi.org/10.1088/0029-5515/43/11/019	journal	November 2003
Complete suppression of the m = 2/ n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D Petty, C. C.; Haye, R. J. La; Luce, T. C. Nuclear Fusion, Vol. 44, Issue 2 https://doi.org/10.1088/0029-5515/44/2/004	journal	January 2004
Electron cyclotron emission temperature fluctuations associated with magnetic islands and real-time identification and control system Berrino, J.; Lazzaro, E.; Cirant, S. Nuclear Fusion, Vol. 45, Issue 11 https://doi.org/10.1088/0029-5515/45/11/016	journal	October 2005
Stabilization and prevention of the 2/1 neoclassical tearing mode for improved performance in DIII-D Prater, R.; Haye, R. J. La; Luce, T. C. Nuclear Fusion, Vol. 47, Issue 5 https://doi.org/10.1088/0029-5515/47/5/001	journal	April 2007
Integrated real-time control of MHD instabilities using multi-beam ECRH/ECCD systems on TCV Felici, F.; Goodman, T. P.; Sauter, O. Nuclear Fusion, Vol. 52, Issue 7 https://doi.org/10.1088/0029-5515/52/7/074001	journal	July 2012
Control-oriented modelling for neoclassical tearing mode stabilization via minimum-seeking techniques Wehner, W.; Schuster, E. Nuclear Fusion, Vol. 52, Issue 7 https://doi.org/10.1088/0029-5515/52/7/074003	journal	July 2012
State-of-the-art neoclassical tearing mode control in DIII-D using real-time steerable electron cyclotron current drive launchers Kolemen, E.; Welander, A. S.; La Haye, R. J. Nuclear Fusion, Vol. 54, Issue 7 https://doi.org/10.1088/0029-5515/54/7/073020	journal	May 2014
Real-time determination of magnetic island location for neoclassical tearing mode control in DIII-D Park, Y. S.; Welander, A. S. Plasma Physics and Controlled Fusion, Vol. 48, Issue 9 https://doi.org/10.1088/0741-3335/48/9/013	journal	August 2006
Real-time control of tearing modes using a line-of-sight electron cyclotron emission diagnostic Hennen, B. A.; Westerhof, E.; Nuij, P. W. J. M. Plasma Physics and Controlled Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0741-3335/52/10/104006	journal	September 2010
Disruption avoidance through the prevention of NTM destabilization in TCV Sheikh, U. A.; Duval, B. P.; Galperti, C. Nuclear Fusion, Vol. 58, Issue 10 https://doi.org/10.1088/1741-4326/aad924	journal	August 2018
Observation of Nonlinear Neoclassical Pressure-Gradient–Driven Tearing Modes in TFTR Chang, Z.; Callen, J. D.; Fredrickson, E. D. Physical Review Letters, Vol. 74, Issue 23 https://doi.org/10.1103/PhysRevLett.74.4663	journal	June 1995
Enhancement of the Stabilization Efficiency of a Neoclassical Magnetic Island by Modulated Electron Cyclotron Current Drive in the ASDEX Upgrade Tokamak Maraschek, M.; Gantenbein, G.; Yu, Q. Physical Review Letters, Vol. 98, Issue 2 https://doi.org/10.1103/PhysRevLett.98.025005	journal	January 2007

Cited By (1)

Electron cyclotron emission based q -profile measurement and concept for equilibrium reconstruction Nelson, A. O.; Austin, M. E.; Kolemen, E. Plasma Physics and Controlled Fusion, Vol. 61, Issue 8 https://doi.org/10.1088/1361-6587/ab24a4	journal	June 2019

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Data for: Simultaneous detection of neoclassical tearing mode and electron cyclotron current drive locations using electron cyclotron emission in DIII-D Kolemen, Egemen https://doi.org/10.17632/pyyxv63dz2 The current record is supplemented by this dataset	dataset	January 2019
Data for: Simultaneous detection of neoclassical tearing mode and electron cyclotron current drive locations using electron cyclotron emission in DIII-D Kolemen, Egemen https://doi.org/10.17632/pyyxv63dz2.1 The current record is supplemented by this dataset	dataset	January 2019