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

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

Journal Article · Fri Jan 23 00:00:00 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)

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:: AC05-06OR23100; FC02-04ER54698

OSTI ID:: 1345534

Alternate ID(s):: OSTI ID: 22331210

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

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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

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