Decoupled recovery of energy and momentum with correction of n = 2 error fields

Paz-Soldan, Carlos A.; Logan, Nikolas C.; Lanctot, Matthew J.; Hanson, Jeremy M.; King, Josh D.; La Haye, Robert J.; Nazikian, Raffi; Park, Jong -K.; Strait, Edward J.

doi:10.1088/0029-5515/55/8/083012

Title: Decoupled recovery of energy and momentum with correction of n = 2 error fields

Journal Article · Mon Jul 06 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/8/083012· OSTI ID:1350065

Paz-Soldan, Carlos A. ^[1]; Logan, Nikolas C. ^[2]; Lanctot, Matthew J. ^[1]; Hanson, Jeremy M. ^[3]; King, Josh D. ^[1]; La Haye, Robert J. ^[1]; Nazikian, Raffi ^[2]; Park, Jong -K. ^[2]; Strait, Edward J. ^[1]

General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Columbia Univ., New York, NY (United States)

Experiments applying known n = 2 “proxy” error fields (EFs) find that the rotation braking introduced by the proxy EF cannot be completely alleviated through optimal n = 2 correction with poorly matched poloidal spectra. This imperfect performance recovery demonstrates the importance of correcting multiple components of the n = 2 field spectrum and is in contrast to previous results with n = 1 EFs despite similar execution. Measured optimal n = 2 proxy EF correction currents are consistent with those required to null dominant mode coupling to the resonant surfaces and minimize the neoclassical toroidal viscosity (NTV) torque, calculated using ideal MHD plasma response computation. Unlike rotation braking, density pumpout can be fully corrected despite poorly matched spectra, indicating density pumpout is driven only by a single component proportional to the resonant coupling. Through precise n = 2 spectral control density pumpout and rotation braking can thus be decoupled. Rotation braking with n = 2 fields is also found to be proportional to the level of concurrent toroidal rotation, consistent with NTV theory. Lastly, plasmas with modest countercurrent rotation are insensitive to the n = 2 field with neither rotation braking nor density pumpout observed.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; AC05-06OR23100; FC02-04ER54698; FG02-04ER54761; SC0001961

OSTI ID:: 1350065

Alternate ID(s):: OSTI ID: 1238921; OSTI ID: 1260743; OSTI ID: 1345402

Journal Information:: Nuclear Fusion, Vol. 55, Issue 8; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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References (28)

Computation of three-dimensional tokamak and spherical torus equilibria Park, Jong-kyu; Boozer, Allen H.; Glasser, Alan H. Physics of Plasmas, Vol. 14, Issue 5 https://doi.org/10.1063/1.2732170	journal	May 2007
Control of Asymmetric Magnetic Perturbations in Tokamaks Park, Jong-kyu; Schaffer, Michael J.; Menard, Jonathan E. Physical Review Letters, Vol. 99, Issue 19 https://doi.org/10.1103/PhysRevLett.99.195003	journal	November 2007
Analysis and correction of intrinsic non-axisymmetric magnetic fields in high- DIII-D plasmas Garofalo, A. M.; Haye, R. J. La; Scoville, J. T. Nuclear Fusion, Vol. 42, Issue 11 https://doi.org/10.1088/0029-5515/42/11/308	journal	October 2002
Active control of type-I edge localized modes with n = 1 and n = 2 fields on JET Liang, Y.; Koslowski, H. R.; Thomas, P. R. Nuclear Fusion, Vol. 50, Issue 2 https://doi.org/10.1088/0029-5515/50/2/025013	journal	January 2010
Symmetry-Breaking Induced Transport in the Vicinity of a Magnetic Island Shaing, K. C. Physical Review Letters, Vol. 87, Issue 24 https://doi.org/10.1103/PhysRevLett.87.245003	journal	November 2001
Sustained suppression of type-I edge-localized modes with dominantly n = 2 magnetic fields in DIII-D Lanctot, M. J.; Buttery, R. J.; de Grassie, J. S. Nuclear Fusion, Vol. 53, Issue 8 https://doi.org/10.1088/0029-5515/53/8/083019	journal	July 2013
Anomalies in the applied magnetic fields in DIII-D and their implications for the understanding of stability experiments Luxon, J. L.; Schaffer, M. J.; Jackson, G. L. Nuclear Fusion, Vol. 43, Issue 12 https://doi.org/10.1088/0029-5515/43/12/024	journal	December 2003
Locked modes in DIII-D and a method for prevention of the low density mode Scoville, J. T.; La Haye, R. J.; Kellman, A. G. Nuclear Fusion, Vol. 31, Issue 5 https://doi.org/10.1088/0029-5515/31/5/006	journal	May 1991
The spectral basis of optimal error field correction on DIII-D Paz-Soldan, C.; Buttery, R. J.; Garofalo, A. M. Nuclear Fusion, Vol. 54, Issue 7 https://doi.org/10.1088/0029-5515/54/7/073013	journal	April 2014
The importance of matched poloidal spectra to error field correction in DIII-D Paz-Soldan, C.; Lanctot, M. J.; Logan, N. C. Physics of Plasmas, Vol. 21, Issue 7 https://doi.org/10.1063/1.4886795	journal	July 2014
Magnetic control of magnetohydrodynamic instabilities in tokamaks Strait, E. J. Physics of Plasmas, Vol. 22, Issue 2 https://doi.org/10.1063/1.4902126	journal	November 2014
Neoclassical tearing modes Buttery, R. J.; Günter, S.; Giruzzi, G. Plasma Physics and Controlled Fusion, Vol. 42, Issue 12B https://doi.org/10.1088/0741-3335/42/12B/306	journal	December 2000
The impact of 3D fields on tearing mode stability of H-modes Buttery, R. J.; Gerhardt, S.; La Haye, R. J. Nuclear Fusion, Vol. 51, Issue 7 https://doi.org/10.1088/0029-5515/51/7/073016	journal	May 2011
Linear ideal MHD predictions for n = 2 non-axisymmetric magnetic perturbations on DIII-D Haskey, S. R.; Lanctot, M. J.; Liu, Y. Q. Plasma Physics and Controlled Fusion, Vol. 56, Issue 3 https://doi.org/10.1088/0741-3335/56/3/035005	journal	February 2014
Plasma rotation driven by static nonresonant magnetic fields Garofalo, A. M.; Solomon, W. M.; Lanctot, M. Physics of Plasmas, Vol. 16, Issue 5 https://doi.org/10.1063/1.3129164	journal	May 2009
Nonaxisymmetric field effects on Alcator C-Mod Wolfe, S. M.; Hutchinson, I. H.; Granetz, R. S. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1883665	journal	May 2005
Measurement, correction and implications of the intrinsic error fields on MAST Kirk, A.; Liu, Yueqiang; Martin, R. Plasma Physics and Controlled Fusion, Vol. 56, Issue 10 https://doi.org/10.1088/0741-3335/56/10/104003	journal	August 2014
Study of in-vessel nonaxisymmetric ELM suppression coil concepts for ITER Schaffer, M. J.; Menard, J. E.; Aldan, M. P. Nuclear Fusion, Vol. 48, Issue 2 https://doi.org/10.1088/0029-5515/48/2/024004	journal	January 2008
Observation of Peak Neoclassical Toroidal Viscous Force in the DIII-D Tokamak Cole, A. J.; Callen, J. D.; Solomon, W. M. Physical Review Letters, Vol. 106, Issue 22 https://doi.org/10.1103/PhysRevLett.106.225002	journal	June 2011
Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas Evans, Todd E.; Moyer, Richard A.; Burrell, Keith H. Nature Physics, Vol. 2, Issue 6 https://doi.org/10.1038/nphys312	journal	May 2006
Neoclassical toroidal viscosity in perturbed equilibria with general tokamak geometry Logan, Nikolas C.; Park, Jong-Kyu; Kim, Kimin Physics of Plasmas, Vol. 20, Issue 12 https://doi.org/10.1063/1.4849395	journal	December 2013
Observation of Plasma Rotation Driven by Static Nonaxisymmetric Magnetic Fields in a Tokamak Garofalo, A. M.; Burrell, K. H.; DeBoo, J. C. Physical Review Letters, Vol. 101, Issue 19 https://doi.org/10.1103/PhysRevLett.101.195005	journal	November 2008
Observation and correction of non-resonant error fields in NSTX Gerhardt, S. P.; Menard, J. E.; Park, J-K Plasma Physics and Controlled Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0741-3335/52/10/104003	journal	September 2010
Error Field Amplification and Rotation Damping in Tokamak Plasmas Boozer, Allen H. Physical Review Letters, Vol. 86, Issue 22 https://doi.org/10.1103/PhysRevLett.86.5059	journal	May 2001
Progress in understanding error-field physics in NSTX spherical torus plasmas Menard, J. E.; Bell, R. E.; Gates, D. A. Nuclear Fusion, Vol. 50, Issue 4 https://doi.org/10.1088/0029-5515/50/4/045008	journal	March 2010
Effect of resonant and non-resonant magnetic braking on error field tolerance in high beta plasmas Reimerdes, H.; Garofalo, A. M.; Strait, E. J. Nuclear Fusion, Vol. 49, Issue 11 https://doi.org/10.1088/0029-5515/49/11/115001	journal	September 2009
Control of Nonaxisymmetric Magnetic Field Perturbations in Tokamaks Boozer, Allen H. Fusion Science and Technology, Vol. 59, Issue 3 https://doi.org/10.13182/FST11-A11697	journal	April 2011
Nonambipolar Transport by Trapped Particles in Tokamaks Park, Jong-kyu; Boozer, Allen H.; Menard, Jonathan E. Physical Review Letters, Vol. 102, Issue 6 https://doi.org/10.1103/PhysRevLett.102.065002	journal	February 2009

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Edge localized mode suppression and plasma response using mixed toroidal harmonic resonant magnetic perturbations in DIII-D Gu, S.; Sun, Y.; Paz-Soldan, C. Nuclear Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1741-4326/aaf5a3	journal	January 2019
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