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Title: ICRF modelling

Abstract

This lecture provides a survey of the methods used to model fast magnetosonic wave coupling, propagation, and absorption in tokamaks. The validity and limitations of three distinct types of modelling codes, which will be contrasted, include discrete models which utilize ray tracing techniques, approximate continuous field models based on a parabolic approximation of the wave equation, and full field models derived using finite difference techniques. Inclusion of mode conversion effects in these models and modification of the minority distribution function will also be discussed. The lecture will conclude with a presentation of time-dependent global transport simulations of ICRF-heated tokamak discharges obtained in conjunction with the ICRF modelling codes. 52 refs., 15 figs.

Authors:
Publication Date:
Research Org.:
Princeton Univ., NJ (USA). Plasma Physics Lab.
OSTI Identifier:
6245971
Report Number(s):
PPPL-2287
ON: DE86006352
DOE Contract Number:
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICR HEATING; PLASMA SIMULATION; TOKAMAK DEVICES; ABSORPTION; ANALYTICAL SOLUTION; FINITE DIFFERENCE METHOD; MAGNETOACOUSTIC WAVES; TIME DEPENDENCE; WAVE PROPAGATION; WKB APPROXIMATION; CLOSED PLASMA DEVICES; HEATING; HIGH-FREQUENCY HEATING; HYDROMAGNETIC WAVES; ITERATIVE METHODS; NUMERICAL SOLUTION; PLASMA HEATING; SIMULATION; THERMONUCLEAR DEVICES; 700101* - Fusion Energy- Plasma Research- Confinement, Heating, & Production; 700105 - Fusion Energy- Plasma Research- Plasma Kinetics-Theoretical- (-1987)

Citation Formats

Phillips, C.K. ICRF modelling. United States: N. p., 1985. Web. doi:10.2172/6245971.
Phillips, C.K. ICRF modelling. United States. doi:10.2172/6245971.
Phillips, C.K. Sun . "ICRF modelling". United States. doi:10.2172/6245971. https://www.osti.gov/servlets/purl/6245971.
@article{osti_6245971,
title = {ICRF modelling},
author = {Phillips, C.K.},
abstractNote = {This lecture provides a survey of the methods used to model fast magnetosonic wave coupling, propagation, and absorption in tokamaks. The validity and limitations of three distinct types of modelling codes, which will be contrasted, include discrete models which utilize ray tracing techniques, approximate continuous field models based on a parabolic approximation of the wave equation, and full field models derived using finite difference techniques. Inclusion of mode conversion effects in these models and modification of the minority distribution function will also be discussed. The lecture will conclude with a presentation of time-dependent global transport simulations of ICRF-heated tokamak discharges obtained in conjunction with the ICRF modelling codes. 52 refs., 15 figs.},
doi = {10.2172/6245971},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 01 00:00:00 EST 1985},
month = {Sun Dec 01 00:00:00 EST 1985}
}

Technical Report:

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  • The relevance of rf-sheath-plasma interactions to ICRF operation in TFTR has been studied. Screen-screen and screen-limiter rf sheaths have been identified and analyzed for the old and new Bay M geometries on TFIR, including sheath voltages driven by both feeders and the central antenna conductor. Calculations have been carried out to determine the effects of ICRF on edge transport (profile flattening by E {times} B convection), impurity influx ({delta}Z{sub eff}) and edge electron heating (FS glow phenomena) as a function of edge plasma parameters, rf power and antenna phasing. It was found that many of the experimentally observed ICRF-edge plasmamore » interactions on TFIR are consistent with the predictions of rf sheath theory.« less
  • The simultaneous effect of ion heating and spatial diffusion due to ICRF heating in tokamak geometry is investigated from the single particle viewpoint. Transitions between passing and trapped trajectories are taken into account in the mapping equations. Specific results are given for typical experimental devices. (Author)
  • A computational model is developed to study the coupling characteristics of an ion cyclotron range of frequencies (ICRF) antenna system to a reactor-size fusion plasma.
  • A simple spectral analysis technique has been developed to analyse the digital signals from an array of magnetic probes for ICRF field measurements in the Tara Tandem Mirror central cell. The wave dispersion relations of both the applied ICRF and the Alfven Ion Cyclotron Instability have been studied and the waves have been identified as slow in cyclotron waves. The radial profiles of field amplitude and wave vectors were also generated. 9 refs., 10 figs.
  • Self-consistent calculations of MHD equilibria, generated by fast wave current drive and including the bootstrap effect, were done to guide and anticipate the results of upcoming experiments on the DIIID tokamak. The simulations predict that 2 MW of ICRF power is more than adequate to create several hundred kiloamperes in steady state; the total current increases with the temperature and density of the target plasma. 12 refs., 12 figs., 1 tab.