Collisionless damping of short wavelength geodesic acoustic modes

Qiu, Zhiyong; Chen, Liu; Zonca, Fulvio

doi:10.1088/0741-3335/51/1/012001

Collisionless damping of short wavelength geodesic acoustic modes

Journal Article · Thu Dec 04 04:00:00 EST 2008 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/51/1/012001· OSTI ID:1130352

Qiu, Zhiyong ^[1]; Chen, Liu; Zonca, Fulvio

University of California, Irvine

Collisionless damping of geodesic acoustic mode (GAM) excited in the large safety factor (q) region of a tokamak plasma is investigated taking into account the effects of finite ion Larmor radius and guiding-center drift orbit width as well as parallel electric field contributions. A corresponding analytical expression for the damping rate including higher-order harmonics of ion transit resonances is systematically derived and agrees well with numerical results in its validity regime.

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

DOE Contract Number:: FG02-04ER54736

OSTI ID:: 1130352

Report Number(s):: DOE-UCI-ER54736

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 51; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

References (12)

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Collisionless damping of geodesic acoustic modes Sugama, H.; Watanabe, T. -H. Journal of Plasma Physics, Vol. 72, Issue 06 https://doi.org/10.1017/S0022377806004958	journal	December 2006

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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Collisionless damping of short wavelength geodesic acoustic modes

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