RADIAL TRANSPORT EFFECTS ON ECCD IN THE TCV AND DIII-D TOKAMAKS AND ON OHMIC DISCHARGES IN THE MST RFP Metadata

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Title

  • Main Title RADIAL TRANSPORT EFFECTS ON ECCD IN THE TCV AND DIII-D TOKAMAKS AND ON OHMIC DISCHARGES IN THE MST RFP

Creator

  • Author: HARVEY, R.W.
    Creator Type: Personal
  • Author: SAUTER, O.
    Creator Type: Personal
  • Author: PRATER, R.
    Creator Type: Personal
  • Author: NIKKOLA, P.
    Creator Type: Personal
  • Author: O'CONNELL, R.
    Creator Type: Personal
  • Author: FOREST, C.B.
    Creator Type: Personal

Publisher

  • Name: General Atomic Company
    Place of Publication: United States
    Additional Info: General Atomics (United States)

Date

  • Creation: 2002-07-01

Language

  • English

Description

  • Content Description: The comprehensive CQL3D Fokker-Planck/Quasilinear simulation code has been benchmarked against experiment over a wide range of electron cyclotron conditions in the DIII-D tokamak (C.C. Petty et al., 14th Topical Conf. on RF Power in Plasmas, 2002). The same code, in disagreement with experiment, gives 560 kA of ECCD for a well documented, completely ECCD-driven, 100 kA TCV shot [O. Sauter et al, PRL, 2000]. Recent work (R.W. Harvey et al, Phys. Rev. Lett., 2002) has resolved the differences as due to radial transport at a level closely consistent with ITER scaling. Transport does not substantially affect DIII-D ECCD, but at similar ECH power has an overwhelming effect on the much smaller TCV. The transport is consistent with electrostatic-type diffusion (D{sub {rho}{rho}} constant in velocity-space) and not with a magnetic-type diffusion (D{sub {rho}{rho}} {proportional_to} |v{parallel}|). Fokker-Planck simulation of Ohmic reversed field pinch (RFP) discharges in the MST device reveals transport velocity dependence stronger than |v{parallel}| will give agreement with current and soft X-ray spectra in standard discharges, but in the higher confinement, current profile controlled PPCD discharges, transport is again electrostatic-like. This is consistent with the object of PPCD, which is to replace magnetic turbulence driven current with auxiliary CD to improve transport. The tokamak and high-confinement RFP results mutually reinforce the constant-in-velocity-space ''electrostatic-type turbulence'' conclusion. The steady-state energy and toroidal current are governed by the same radial transport equation.
  • Physical Description: Medium: X; Size: 9 pages

Subject

  • Keyword: Diffusion
  • Keyword: Ecr Heating
  • STI Subject Categories: 43 Particle Accelerators
  • Keyword: Cyclotrons
  • Keyword: Doublet-3 Device
  • Keyword: Mst Device
  • Keyword: Simulation
  • Keyword: Velocity
  • Keyword: Confinement
  • Keyword: Electrons
  • Keyword: Turbulence
  • Keyword: X-Ray Spectra
  • Keyword: Transport

Source

  • Conference: 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Aix-En-Provence (FR), 05/13/2002--05/16/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 12TH JOINT WORKSHOP ON ELECTRON CYCLOTRON EMISSION AND ELECTRON CYCLOTRON RESONANCE HEATING, MAY 13-16, 2002, IN AIX-EN-PROVENCE, FRANCE AND TO BE PUBLISHED IN THE ''PROCEEDINGS''

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: NONE
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 804667
  • Archival Resource Key: ark:/67531/metadc739022

Note

  • Display Note: Oakland Operations Office, Oakland, CA (US); INIS