Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure

Delgado-Aparicio, L.; Sugiyama, L.; Shiraiwa, S.; Irby, J.; Granetz, R.; Parker, R.; Baek, S. G.; Faust, I.; Wallace, G.; Gates, D. A.; Gorelenkov, N.; Mumgaard, R.; Scott, S.; Bertelli, N.; Gao, C.; Greenwald, M.; Hubbard, A.; Hughes, J.; Marmar, E.; Phillips, P. E.; Rice, J. E.; Rowan, W. L.; Wilson, R.; Wolfe, S.; Wukitch, S.

doi:10.1063/1.4919964

Title: Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure

Journal Article · Wed May 06 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4919964· OSTI ID:1546993

Delgado-Aparicio, L. ^[1];

^[2]; Shiraiwa, S. ^[2]; Irby, J. ^[2]; Granetz, R. ^[2]; Parker, R. ^[2]; Baek, S. G. ^[2]; Faust, I. ^[2]; Wallace, G. ^[2]; Gates, D. A. ^[1]; Gorelenkov, N. ^[1]; Mumgaard, R. ^[2]; Scott, S. ^[1]; Bertelli, N. ^[1]; Gao, C. ^[2];

^[2]; Hubbard, A. ^[2];

^[2]; Marmar, E. ^[2];

^[3] more »

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Texas, Austin, TX (United States)

Here in this paper, new experimental observations are reported on the structure and dynamics of short-lived periodic (1,1) “fishbone”-like oscillations that appear during radio frequency heating and current-drive experiments in tokamak plasmas. For the first time, measurements can directly relate changes in the high energy electrons to the mode onset, saturation, and damping. In the relatively high collisionality of Alcator C-Mod with lower hybrid current drive, the instability appears to be destabilized by the non-resonant suprathermal electron pressure—rather than by wave-particle resonance, rotates toroidally with the plasma and grows independently of the (1,1) sawtooth crash driven by the thermal plasma pressure.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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

Grant/Contract Number:: FC02-99ER54512; SC0007883; AC02-09CH11466

OSTI ID:: 1546993

Alternate ID(s):: OSTI ID: 1228129

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (2)

Electron fishbones destabilized nonresonantly by lower hybrid current drive Sugiyama, Linda E.; Delgado-Aparicio, L.; Shiraiwa, S. Physics of Plasmas, Vol. 25, Issue 8 https://doi.org/10.1063/1.5034780	journal	August 2018
Suprathermal electron driven fishbone instability in the TCV tokamak Choi, D.; Merle, A.; Coda, S. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab5147	journal	November 2019

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