Small-action Particles in a Tokamak in the Presence of an n = 1 Mode

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Description

It is found that an m = n = 1 mode with the amplitude exceeding a certain threshold can lead to stochastic motion of energetic ions in tokamaks, the large orbit width particles (potatoes) being most easily affected. An n = 1 mode can redistribute particles also in the absence of stochasticity but only when the perturbation is quickly switched on/off, e.g., due to sawtooth crash. In the latter case, the perturbation results in regular motion of particles around a certain helical orbit, at which a resonance driven by the mode but having no amplitude threshold takes place.

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154 Kilobytes pages

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White, R.B.; Lutsenko, V.V.; Kolesnichenko, Ya. I. & Yakovenko, Yu. V. November 1, 1999.

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Description

It is found that an m = n = 1 mode with the amplitude exceeding a certain threshold can lead to stochastic motion of energetic ions in tokamaks, the large orbit width particles (potatoes) being most easily affected. An n = 1 mode can redistribute particles also in the absence of stochasticity but only when the perturbation is quickly switched on/off, e.g., due to sawtooth crash. In the latter case, the perturbation results in regular motion of particles around a certain helical orbit, at which a resonance driven by the mode but having no amplitude threshold takes place.

Physical Description

154 Kilobytes pages

Notes

INIS; OSTI as DE00014411

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  • Other Information: PBD: 1 Nov 1999

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  • Report No.: PPPL-3376
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/14411 | External Link
  • Office of Scientific & Technical Information Report Number: 14411
  • Archival Resource Key: ark:/67531/metadc622275

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  • November 1, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 1:09 p.m.

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White, R.B.; Lutsenko, V.V.; Kolesnichenko, Ya. I. & Yakovenko, Yu. V. Small-action Particles in a Tokamak in the Presence of an n = 1 Mode, report, November 1, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc622275/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.