Lack of dependence on resonant error field of locked mode island size in ohmic plasmas in DIII-D

Haye, R. J.  La; Paz-Soldan, C.; Strait, E. J.

doi:10.1088/0029-5515/55/2/023011

Title: Lack of dependence on resonant error field of locked mode island size in ohmic plasmas in DIII-D

Journal Article · Thu Jan 22 23:00:00 EST 2015 · Nuclear Fusion

DOI: https://doi.org/10.1088/0029-5515/55/2/023011 · OSTI ID:1345534

Haye, R. J. La ^[1]; Paz-Soldan, C. ^[2]; Strait, E. J. ^[2]

General Atomics, San Diego, CA (United States); General Atomics
General Atomics, San Diego, CA (United States)

DIII-D experiments show that fully penetrated resonant n=1 error field locked modes in Ohmic plasmas with safety factor q₉₅≳3 grow to similar large disruptive size, independent of resonant error field correction. Relatively small resonant (m/n=2/1) static error fields are shielded in Ohmic plasmas by the natural rotation at the electron diamagnetic drift frequency. However, the drag from error fields can lower rotation such that a bifurcation results, from nearly complete shielding to full penetration, i.e., to a driven locked mode island that can induce disruption.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: General Atomics, San Diego, CA (United States)

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

Grant/Contract Number:: FC02-04ER54698; AC05-06OR23100

OSTI ID:: 1345534

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 55; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (20)

A method to measure poloidal field coil irregularities in toroidal plasma devices La Haye, R. J.; Scoville, J. T. Review of Scientific Instruments, Vol. 62, Issue 9 https://doi.org/10.1063/1.1142330	journal	September 1991
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
Study of a low β classical tearing mode in DIII-D Chu, M. S.; La Haye, R. J.; Austin, M. E. Physics of Plasmas, Vol. 9, Issue 11 https://doi.org/10.1063/1.1510666	journal	November 2002
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
Growth and decay of runaway electrons above the critical electric field under quiescent conditions Paz-Soldan, C.; Eidietis, N. W.; Granetz, R. Physics of Plasmas, Vol. 21, Issue 2 https://doi.org/10.1063/1.4866912	journal	February 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
Saturation of the tearing mode White, Roscoe B.; Monticello, D. A.; Rosenbluth, Marshall N. Physics of Fluids, Vol. 20, Issue 5 https://doi.org/10.1063/1.861939	journal	January 1977
Stability of tearing modes in tokamak plasmas Hegna, C. C.; Callen, J. D. Physics of Plasmas, Vol. 1, Issue 7 https://doi.org/10.1063/1.870628	journal	July 1994
Bifurcated states of a rotating tokamak plasma in the presence of a static error-field Fitzpatrick, Richard Physics of Plasmas, Vol. 5, Issue 9 https://doi.org/10.1063/1.873000	journal	September 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
Error field mode studies on JET, COMPASS-D and DIII-D, and implications for ITER Buttery, R. J.; Benedetti, M. De'; Gates, D. A. Nuclear Fusion, Vol. 39, Issue 11Y https://doi.org/10.1088/0029-5515/39/11Y/323	journal	November 1999
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
Multi-mode error field correction on the DIII-D tokamak Scoville, J. T.; Haye, R. J. La Nuclear Fusion, Vol. 43, Issue 4 https://doi.org/10.1088/0029-5515/43/4/305	journal	March 2003
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
Error field detection in DIII-D by magnetic steering of locked modes Shiraki, D.; La Haye, R. J.; Logan, N. C. Nuclear Fusion, Vol. 54, Issue 3 https://doi.org/10.1088/0029-5515/54/3/033006	journal	February 2014
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
Nonlinear error-field penetration in low density ohmically heated tokamak plasmas Fitzpatrick, R. Plasma Physics and Controlled Fusion, Vol. 54, Issue 9 https://doi.org/10.1088/0741-3335/54/9/094002	journal	August 2012
Measurements of the toroidal torque balance of error field penetration locked modes Shiraki, D.; Paz-Soldan, C.; Hanson, J. M. Plasma Physics and Controlled Fusion, Vol. 57, Issue 2 https://doi.org/10.1088/0741-3335/57/2/025016	journal	January 2015
Tokamak Operation with Safety Factor q 95 < 2 via Control of MHD Stability Piovesan, P.; Hanson, J. M.; Martin, P. Physical Review Letters, Vol. 113, Issue 4 https://doi.org/10.1103/PhysRevLett.113.045003	journal	July 2014
From Current-Driven to Neoclassically Driven Tearing Modes Reimerdes, H.; Sauter, O.; Goodman, T. Physical Review Letters, Vol. 88, Issue 10 https://doi.org/10.1103/PhysRevLett.88.105005	journal	February 2002

Cited By (1)

Direct measurements of internal structures of born-locked modes and the key role in triggering tokamak disruptions Du, X. D.; Shafer, M. W.; Hu, Q. M. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5085329	journal	April 2019

Similar Records

Error field detection in DIII-D by magnetic steering of locked modes

Journal Article · Wed Feb 19 23:00:00 EST 2014 · Nuclear Fusion · OSTI ID:1352308

Shiraki, Daisuke; La Haye, Robert J.; Logan, Nikolas C.; +2 more

Measurements of the toroidal torque balance of error field penetration locked modes

Journal Article · Sun Jan 04 23:00:00 EST 2015 · Plasma Physics and Controlled Fusion · OSTI ID:1367534

Shiraki, Daisuke; Paz-Soldan, Carlos; Hanson, Jeremy M.; +6 more

Use of an m=2, n=1 static error field correction coil, {open_quotes}The C-coil,{close_quotes} on DIII-D to avoid disruptive locked modes

Conference · Mon May 01 00:00:00 EDT 1995 · OSTI ID:135140

La Haye, R J; Scoville, J T

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Title: Lack of dependence on resonant error field of locked mode island size in ohmic plasmas in DIII-D

Citation Formats

References (20)

Cited By (1)

Similar Records

Related Subjects