Conceptual study of electron ripple injection for tokamak transport control

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A non-intrusive method for inducing radial electric field based on electron ripple injection is under development by the Princeton CDX-U group. The radial electric field is known to play an important role in the L-H and H-VH mode transition according to the recent theoretical and experimental research. It is therefore important to develop a non-intrusive tool to control the radial electric field profile in tokamak plasmas. The present technique utilizes externally-applied local magnetic ripple fields to trap electrons at the edge, allowing them to penetrate towards the plasma center via {gradient}B and curvature drifts, causing the flux surfaces to charge ... continued below

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50 p.

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Choe, W.; Ono, M. & Chang, C.S. August 1, 1995.

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  • Choe, W.
  • Ono, M. Princeton Univ., NJ (United States). Plasma Physics Lab.
  • Chang, C.S. New York Univ., NY (United States). Courant Inst. of Mathematical Sciences

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Description

A non-intrusive method for inducing radial electric field based on electron ripple injection is under development by the Princeton CDX-U group. The radial electric field is known to play an important role in the L-H and H-VH mode transition according to the recent theoretical and experimental research. It is therefore important to develop a non-intrusive tool to control the radial electric field profile in tokamak plasmas. The present technique utilizes externally-applied local magnetic ripple fields to trap electrons at the edge, allowing them to penetrate towards the plasma center via {gradient}B and curvature drifts, causing the flux surfaces to charge up negatively. Electron cyclotron resonance heating is utilized to increase the trapped population and the electron drift velocity by raising the perpendicular energy of trapped electrons. In order to quantify the effects of cyclotron resonance heating on electrons, the temperature anisotropy of resonant electrons in a tokamak plasma is calculated. For the calculation of anisotropic temperatures, energy moments of the bounce-averaged Fokker-Planck equation with a bi-Maxwellian distribution function for heated electrons are solved, assuming a moderate wave power and a constant quasilinear diffusion coefficient. Simulation using a guiding-center orbit model have been performed to understand the behavior of suprathermal electrons in the presence of ripple fields. Examples for CDX-U and ITER parameters are given.

Physical Description

50 p.

Notes

INIS; OSTI as DE96007497

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  • Other Information: PBD: Aug 1995

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  • Other: DE96007497
  • Report No.: PPPL--3138
  • Grant Number: AC02-76CH03073;FG02-86ER53223
  • DOI: 10.2172/211608 | External Link
  • Office of Scientific & Technical Information Report Number: 211608
  • Archival Resource Key: ark:/67531/metadc666483

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Creation Date

  • August 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 15, 2016, 7:05 p.m.

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Choe, W.; Ono, M. & Chang, C.S. Conceptual study of electron ripple injection for tokamak transport control, report, August 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc666483/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.