Variational full wave calculation of fast wave current drive in DIII-D using the ALCYON code

Technical Report · Wed Apr 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/7046699· OSTI ID:7046699

Becoulet, A; Moreau, D ^[1]

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1. Association Euratom-CEA, Centre d'Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Dept. de Recherches sur la Fusion Controlee

Initial fast wave current drive simulations performed with the ALCYON code for the 60 MHz DIII-D experiment are presented. Two typical shots of the 1991 summer campaign were selected with magnetic field intensities of 1 and 2 teslas respectively. The results for the wave electromagnetic field in the plasma chamber are displayed. They exhibit a strong enrichment of the poloidal mode number m-spectrum which leads to the upshift of the parallel wavenumber, {kappa}{perpendicular}, and to the wave absorption. The m-spectrum is bounded when the local poloidal wavenumber reaches the Alfven wavenumber and the {kappa}{perpendicular} upshifts do not destroy the wave directionality. Linear estimations of the driven current are made. The current density profiles are found to be peaked and we find that about 88 kA can be driven in the 1 tesla/1.7 keV phase with 1.7 MW coupled to the electrons. In the 2 tesla/3.4 keV case, 47 kA are driven with a total power of 1.5 MW, 44% of which are absorbed on the hydrogen minority, through the second harmonic ion cyclotron resonance. The global efficiency is then 0.18 {times} 10{sup 19} A m{sup {minus}2}W{sup {minus}1} if one considers only the effective power going to the electrons.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 7046699
• Report Number(s): GA-A-20846; ON: DE92016572
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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DOUBLET-3 DEVICE
NON-INDUCTIVE CURRENT DRIVE
VARIATIONAL METHODS
A CODES
ALFVEN WAVES
COMPUTERIZED SIMULATION
CURRENT DENSITY
FOKKER-PLANCK EQUATION
MAGNETIC FIELDS
MHD EQUILIBRIUM
WAVE PROPAGATION
CLOSED PLASMA DEVICES
COMPUTER CODES
DIFFERENTIAL EQUATIONS
EQUATIONS
EQUILIBRIUM
HYDROMAGNETIC WAVES
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700350* - Plasma Production
Heating
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990200 - Mathematics & Computers