Simulation of enhanced tokamak performance on DIII-D using fast wave current drive

Conference · Sat May 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10186315· OSTI ID:6323770

deGrassie, J S; Pinsker, R I; Chan, V S; Prater, R; John, H ^[1]; Baity, F W; Goulding, R H; Hoffman, D J ^[2]

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1. General Atomics, San Diego, CA (United States)
2. Oak Ridge National Lab., TN (United States)

The fast magnetosonic wave is now recognized to be a leading candidate for noninductive for the tokamak reactor due to the ability of the wave to penetrate to the hot dense core region. Fast wave current drive (FWCD) experiments on D3D have realized up to 120 kA of rf current drive, with up to 40% of the plasma current driven noninductively. The success of these experiments at 60 MHZ with a 2 MW transmitter source capability has led to a major upgrade of the FWCD system. Two additional transmitters, 30 to 120 NM, with a 2 MW source capability each, will be added together with two new four-strap antennas in early 1994. Another major thrust of the D3-D program is to develop advanced tokamak modes of operation, simultaneously demonstrating improvements in confinement and stability in quasi-steady-state operation. In some of the initial advanced tokamak experiments on D3-D with neutral beam heated (NBI) discharges it has been demonstrated that energy confinement nine can be improved by rapidly elongating the plasma to force the current density profile to be more centrally peaked. However, this high-l[sub i] phase of the discharge with the commensurate improvement in confinement is transient as the current density profile relaxes. By applying FWCD to the core of such a [kappa]-ramped discharge it may be possible to sustain the high internal inductance and elevated confinement.Using computational tools validated on the initial DM-D FWCD experiments we find that such a high-l[sub i] advanced tokamak discharge should be capable of sustainment at the 1 MA level with the upgraded capability of the FWCD system.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114; AC05-84OR21400
• OSTI ID: 6323770
• Report Number(s): GA-A-21312; CONF-930720--2; ON: DE93014009
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
CLOSED PLASMA DEVICES
COMPUTERIZED SIMULATION
CONFINEMENT
CONFINEMENT TIME
CURRENT DENSITY
DOUBLET-3 DEVICE
MAGNETIC CONFINEMENT
MODIFICATIONS
NON-INDUCTIVE CURRENT DRIVE
PERFORMANCE
PLASMA CONFINEMENT
PLASMA WAVES
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES