Properties of Alfven Eigenmodes in the TAE range on the National Spherical Torus Experiment-Upgrade

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A second Neutral Beam (NB) injection line is being installed on the NSTX Upgrade device, resulting in six NB sources with di erent tangency radii that will be available for heating and current drive. This work explores the properties of instabilities in the frequency range of the Toroidal Alfv#19;en Eigenmode (TAE) for NSTX-U scenarios with various NB injection geometries, from more perpendicular to more tangential, and with increased toroidal magnetic eld with respect to previous NSTX scenarios. Predictions are based on analysis through the ideal MHD code NOVA-K. For the scenarios considered in this work, modi cations of the Alfv#19;en ... continued below

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Creator: Unknown. April 24, 2013.

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Description

A second Neutral Beam (NB) injection line is being installed on the NSTX Upgrade device, resulting in six NB sources with di erent tangency radii that will be available for heating and current drive. This work explores the properties of instabilities in the frequency range of the Toroidal Alfv#19;en Eigenmode (TAE) for NSTX-U scenarios with various NB injection geometries, from more perpendicular to more tangential, and with increased toroidal magnetic eld with respect to previous NSTX scenarios. Predictions are based on analysis through the ideal MHD code NOVA-K. For the scenarios considered in this work, modi cations of the Alfv#19;en continuum result in a frequency upshift and a broadening of the radial mode structure. The latter e ect may have consequences for fast ion transport and loss. Preliminary stability considerations indicate that TAEs are potentially unstable, with ion Landau damping representing the dominant damping mechanism

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  • Physics of Plasmas (April 2013)

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  • Report No.: PPPL-4868
  • Grant Number: DE-ACO2-09CH11466
  • DOI: 10.2172/1089858 | External Link
  • Office of Scientific & Technical Information Report Number: 1089858
  • Archival Resource Key: ark:/67531/metadc843997

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  • April 24, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 27, 2016, 7:16 p.m.

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Properties of Alfven Eigenmodes in the TAE range on the National Spherical Torus Experiment-Upgrade, report, April 24, 2013; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc843997/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.