Characterization of MHD activity and its influence on radiation asymmetries during massive gas injection in DIII-D

Shiraki, Daisuke; Commaux, Nicolas; Baylor, Larry R.; Eidietis, Nicholas W.; Hollmann, Eric M.; Izzo, Valerie A.; Moyer, Richard A.; Paz-Soldan, Carlos

doi:10.1088/0029-5515/55/7/073029

Title: Characterization of MHD activity and its influence on radiation asymmetries during massive gas injection in DIII-D

Journal Article · Fri Jun 26 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/7/073029· OSTI ID:1353121

^[1]; Commaux, Nicolas ^[1];

^[1]; Eidietis, Nicholas W. ^[2]; Hollmann, Eric M. ^[3]; Izzo, Valerie A. ^[3]; Moyer, Richard A. ^[3]; Paz-Soldan, Carlos ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Univ. of California San Diego, La Jolla, CA (United States)

Measurements from the DIII-D tokamak show that toroidal radiation asymmetries during fast shutdown by massive gas injection (MGI) are largely driven by n = 1 magnetohydrodynamic modes during the thermal quench. The phenomenology of these modes, which are driven unstable by profile changes as the thermal energy is quenched, is described based on detailed magnetic measurements. The toroidal evolution of the dominantly n = 1 perturbation is understood to be a function of three parameters: the location of the MGI port, pre-MGI plasma rotation, and n = 1 error fields. The resulting level of radiation asymmetry in these DIII-D plasmas is modest, with a toroidal peaking factor (TPF) of 1.2 +/- 0.1 for the total thermal quench energy and 1.4 +/- 0.3 for the peak radiated power, both of which are below the estimated limit for ITER (TPF approximate to 2) (Sugihara et al 2007 Nucl. Fusion 47 337).

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Research Organization:: General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: FC02-04ER54698; AC05-00OR22725; FG02-07ER54609

OSTI ID:: 1353121

Alternate ID(s):: OSTI ID: 1238886; OSTI ID: 1658020

Journal Information:: Nuclear Fusion, Vol. 55, Issue 7; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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References (21)

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Cited By (5)

Thermal quench mitigation and current quench control by injection of mixed species shattered pellets in DIII-D Shiraki, D.; Commaux, N.; Baylor, L. R. Physics of Plasmas, Vol. 23, Issue 6 https://doi.org/10.1063/1.4954389	journal	June 2016
Measurement of toroidal variation in conducted heat loads in locked mode induced disruptions on DIII-D Hollmann, E. M.; Commaux, N.; Eidietis, N. W. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5052450	journal	October 2018
Relationship between locked modes and thermal quenches in DIII-D Sweeney, R.; Choi, W.; Austin, M. Nuclear Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/1741-4326/aaaf0a	journal	March 2018
Physics of runaway electrons in tokamaks Breizman, Boris N.; Aleynikov, Pavel; Hollmann, Eric M. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab1822	journal	June 2019
The impact of an m / n = 2/1 locked mode on the disruption process during a massive gas injection shutdown on J-TEXT Tong, R. H.; Lin, Z. F.; Liu, L. Z. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32a3	journal	August 2019

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
disruption mitigation
massive gas injection
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Tokamak

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