Energetic Particle-induced Geodesic Acoustic Mode

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A new energetic particle-induced Geodesic Acoustic Mode (EGAM) is shown to exist. The mode frequency, mode structure, and mode destabilization are determined non-perturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large for high energetic particle pressure and large safety factor. These results are consistent with the recent experimental observation of the beam- driven n=0 mode in DIII-D. The new mode is important since it can degrade energetic particle confinement ... continued below

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348 Kb

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Fu, G. Y. September 12, 2008.

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Description

A new energetic particle-induced Geodesic Acoustic Mode (EGAM) is shown to exist. The mode frequency, mode structure, and mode destabilization are determined non-perturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large for high energetic particle pressure and large safety factor. These results are consistent with the recent experimental observation of the beam- driven n=0 mode in DIII-D. The new mode is important since it can degrade energetic particle confinement as shown in the DIII-D experiments. The new mode may also affect the thermal plasma confinement via its interaction with plasma micro-turbulence.

Physical Description

348 Kb

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  • Physical Review Letters (June 2008)

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  • Report No.: PPPL-4347
  • Grant Number: DE-ACO2-76CHO3073
  • DOI: 10.2172/938974 | External Link
  • Office of Scientific & Technical Information Report Number: 938974
  • Archival Resource Key: ark:/67531/metadc897553

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Creation Date

  • September 12, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 18, 2016, 10:11 p.m.

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Fu, G. Y. Energetic Particle-induced Geodesic Acoustic Mode, report, September 12, 2008; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc897553/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.