skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: ICRF heating in JET high-performance discharges: Analysis of the effects on the plasma performance

Abstract

In JET high-performance discharges (ELM-free hot-ion H-mode plasmas and optimised shear discharges) ion cyclotron resonance frequency (ICRF) heating is used routinely in combination with neutral beam injection (NBI). Although NBI is the dominating heating mechanism, ICRF heating has been found to play an important role in obtaining good performance. The impact of various ICRF techniques on the performance has been analyzed using numerical simulations. In the hydrogen minority heating scheme second harmonic deuteron absorption is found to improve central bulk ion heating. By using multiple ICRF frequencies the tails in the distribution functions of the resonating ions can be tailored to enhance the bulk ion heating. Bulk ion heating fractions of up to 50% of the total ICRF power have been obtained in this way. Analysis of {sup 3}He minority heating in first optimised shear discharges at 4 T is presented. The effects of different antenna phasings on the performance have been found to be consistent with an ICRF induced pinch of resonating ions predicted by theory. In optimised shear discharges +90 deg. phasing is found to give the best performance, while in hot-ion H-modes smaller differences between various phasings are observed.

Authors:
 [1];  [2]; ; ;  [3]
  1. Heilsinki University of Technology, Association Euratom-TEKES (Finland)
  2. CEA Cadarache, F-13108 St. Paul-lez-Durance (France)
  3. JET Joint Undertaking, Abingdon, Oxfordshire, OX14 3EA (United Kingdom)
Publication Date:
OSTI Identifier:
21210434
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Conference: 13. topical conference on radio frequency power in plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: DOI: 10.1063/1.59720; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; BEAM INJECTION HEATING; DEUTERONS; DISTRIBUTION FUNCTIONS; EDGE LOCALIZED MODES; ELECTRON TEMPERATURE; FOKKER-PLANCK EQUATION; H-MODE PLASMA CONFINEMENT; HELIUM 3; ICR HEATING; ION TEMPERATURE; JET TOKAMAK; MONTE CARLO METHOD; NEUTRAL ATOM BEAM INJECTION; PERFORMANCE; PLASMA; PLASMA SIMULATION; RF SYSTEMS; SHEAR

Citation Formats

Mantsinen, M. J., Eriksson, L.-G., Gormezano, C., Rimini, F. G., and Sips, A. C. C. ICRF heating in JET high-performance discharges: Analysis of the effects on the plasma performance. United States: N. p., 1999. Web. doi:10.1063/1.59720.
Mantsinen, M. J., Eriksson, L.-G., Gormezano, C., Rimini, F. G., & Sips, A. C. C. ICRF heating in JET high-performance discharges: Analysis of the effects on the plasma performance. United States. doi:10.1063/1.59720.
Mantsinen, M. J., Eriksson, L.-G., Gormezano, C., Rimini, F. G., and Sips, A. C. C. Mon . "ICRF heating in JET high-performance discharges: Analysis of the effects on the plasma performance". United States. doi:10.1063/1.59720.
@article{osti_21210434,
title = {ICRF heating in JET high-performance discharges: Analysis of the effects on the plasma performance},
author = {Mantsinen, M. J. and Eriksson, L.-G. and Gormezano, C. and Rimini, F. G. and Sips, A. C. C.},
abstractNote = {In JET high-performance discharges (ELM-free hot-ion H-mode plasmas and optimised shear discharges) ion cyclotron resonance frequency (ICRF) heating is used routinely in combination with neutral beam injection (NBI). Although NBI is the dominating heating mechanism, ICRF heating has been found to play an important role in obtaining good performance. The impact of various ICRF techniques on the performance has been analyzed using numerical simulations. In the hydrogen minority heating scheme second harmonic deuteron absorption is found to improve central bulk ion heating. By using multiple ICRF frequencies the tails in the distribution functions of the resonating ions can be tailored to enhance the bulk ion heating. Bulk ion heating fractions of up to 50% of the total ICRF power have been obtained in this way. Analysis of {sup 3}He minority heating in first optimised shear discharges at 4 T is presented. The effects of different antenna phasings on the performance have been found to be consistent with an ICRF induced pinch of resonating ions predicted by theory. In optimised shear discharges +90 deg. phasing is found to give the best performance, while in hot-ion H-modes smaller differences between various phasings are observed.},
doi = {10.1063/1.59720},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}