The build-up of energetic electrons triggering electron cyclotron emission bursts due to a magnetohydrodynamic mode at the edge of tokamaks

Li, Erzhong; Austin, Max E.; White, R. B.; Taylor, Gary

doi:10.1063/1.4999186

Title: The build-up of energetic electrons triggering electron cyclotron emission bursts due to a magnetohydrodynamic mode at the edge of tokamaks

Journal Article · Mon Aug 21 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4999186· OSTI ID:1404946

Li, Erzhong ^[1]; Austin, Max E. ^[2]; White, R. B. ^[3];

^[3]

Chinese Academy of Science, Hefei (People's Republic of China)
Univ. of Texas, Austin, TX (United States)
Princeton Univ., Princeton, NJ (United States)

Intense bursts of electron cyclotron emission (ECE) triggered by magnetohydrodynamic (MHD) instabilities such as edge localized modes (ELMs) have been observed on many tokamaks. On the DIII-D tokamak, it is found that an MHD mode is observed to trigger the ECE bursts in the low collisionality regime at the plasma edge. ORBIT-code simulations have shown that energetic electrons build up due to an interaction between barely trapped electrons with an MHD mode (f = 50 kHz for current case). The energetic tail of the electron distribution function develops a bump within several microseconds for this collisionless case. This behavior depends on the competition between the perturbing MHD mode and slowing down and pitch angle scattering due to collisions. As a result, for typical DIII-D parameters, the calculated ECE radiation transport predicted by ORBIT is in excellent agreement with ECE measurements, clarifying the electron dynamics of the ECE bursts for the first time.

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

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FG02-95ER54309; AC02-09CH11466; FC02-04ER54698; FG03-97ER54415

OSTI ID:: 1404946

Alternate ID(s):: OSTI ID: 1375663

Journal Information:: Physics of Plasmas, Vol. 24, Issue 9; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations Willensdorfer, M.; Cote, T. B.; Griener, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aadc39	journal	November 2018
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