Effects of toroidal field ripple on suprathermal ions in tokamak plasmas

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Analytic calculations of three important effects of toroidal field ripple on suprathermal ions in tokamak plasmas are presented. In the first process, collisional ripple-trapping, beam ions become trapped in local magnetic wells near their banana tips due to pitch-angle scattering as they traverse the ripple on barely unripple-trapped orbits. In the second process, collisionless ripple-trapping, near-perpendicular untrapped ions are captured (again near a banana tip) due to their finite orbits, which carry them out into regions of higher ripple. In the third process, banana-drift diffusion, fast-ion banana orbits fail to close precisely, due to a ripple-induced variable lingering period near ... continued below

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Pages: 54

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Goldston, R.J. & Towner, H.H. February 1, 1980.

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Description

Analytic calculations of three important effects of toroidal field ripple on suprathermal ions in tokamak plasmas are presented. In the first process, collisional ripple-trapping, beam ions become trapped in local magnetic wells near their banana tips due to pitch-angle scattering as they traverse the ripple on barely unripple-trapped orbits. In the second process, collisionless ripple-trapping, near-perpendicular untrapped ions are captured (again near a banana tip) due to their finite orbits, which carry them out into regions of higher ripple. In the third process, banana-drift diffusion, fast-ion banana orbits fail to close precisely, due to a ripple-induced variable lingering period near the banana tips. These three mechanisms lead to substantial radial transport of banana-trapped, neutral-beam-injected ions when the quantity ..cap alpha..* identical with epsilon/sin theta/Nqdelta is of order unity or smaller.

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Pages: 54

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: PPPL-1637
  • Grant Number: EY-76-C-02-3073
  • DOI: 10.2172/5634416 | External Link
  • Office of Scientific & Technical Information Report Number: 5634416
  • Archival Resource Key: ark:/67531/metadc1093929

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 1, 1980

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • Feb. 26, 2018, 12:44 p.m.

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Goldston, R.J. & Towner, H.H. Effects of toroidal field ripple on suprathermal ions in tokamak plasmas, report, February 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1093929/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.