Enhanced toroidal flow stabilization of edge localized modes with increased plasma density

Cheng, Shikui; Zhu, Ping; Banerjee, Debabrata

doi:10.1063/1.4990978

Title: Enhanced toroidal flow stabilization of edge localized modes with increased plasma density

Journal Article · Mon Aug 28 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4990978· OSTI ID:1474295

Cheng, Shikui ^[1];

^[2];

^[1]

Univ. of Science and Technology of China, Anhui (People's Republic of China)
Univ. of Science and Technology of China, Anhui (People's Republic of China); Univ. of Wisconsin-Madison, Madison, WI (United States)

Toroidal flow alone is generally thought to have an important influence on tokamak edge pedestal stability, even though theoretical analysis often predicts merely a weak stabilizing effect of toroidal flow on the edge localized modes (ELMs) in experimental parameter regimes. For the first time, we find from two-fluid MHD calculations that such a stabilization, however, can be significantly enhanced by increasing the edge plasma density. Our finding resolves a long-standing mystery whether or how toroidal rotation can indeed have an effective influence on ELMs, and explains why the ELM mitigation and suppression by toroidal rotation are more favorably achieved in higher collisionality regime in recent experiments. Furthermore, the finding suggests a new control scheme on modulating toroidal flow stabilization of ELMs with plasma density, along with a new additional constraint on the optimal level of plasma density for the desired edge plasma conditions

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-86ER53218; AC02-05CH11231; FC02-08ER54975

OSTI ID:: 1474295

Alternate ID(s):: OSTI ID: 1377086

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: 7 works

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