Fast wave current drive system design for DIII-D

Conference · Tue Sep 01 00:00:00 EDT 1992

OSTI ID:10117512

deGrassie, J S; Callis, R; Lin-Liu, Y R; Moeller, C; Petty, C C; Phelps, D R; Pinsker, R I; Remsen, D ^[1]; Baity, F W; Hoffman, D J; Taylor, D J ^[2]; Arnold, W; Martin, S ^[3]

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1. General Atomics, San Diego, CA (United States)
2. Oak Ridge National Lab., TN (United States)
3. ANT-Nachrichtentechnik GmbH, Backnang (Germany)

DIII-D has a major effort underway to develop the physics and technology of fast wave electron heating and current drive in conjunction with electron cyclotron heating. The present system consists of a four strap antenna driven by one 2 MW transmitter in the 32--60 MHz band. Experiments have been successful in demonstrating the physics of heating and current drive. In order to validate fast wave current drive for future machines a greater power capability is necessary to drive all of the plasma current. Advanced tokamak modeling for DIII-D has indicated that this goal can be met for plasma configurations of interest (i.e. high {beta} VH-mode discharges) with 8 MW of transmitter fast wave capability. It is proposed that four transmitters drive fast wave antennas at three locations in DIII-D to provide the power for current drive and current profile modification. As the next step in acquiring this capability, two modular four strap antennas are in design and the procurement of a high power transmitter in the 30--120 MHz range is in progress. Additionally, innovations in the technology are being investigated, such as the use of a coupled combine antenna to reduce the number of required feedthroughs and to provide for parallel phase velocity variation with a relatively small change in frequency, and the use of fast ferrite tuners to provide millisecond timescale impedance matching. A successful test of a low power fast ferrite prototype was conducted on DIII-D.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114; AC03-89ER52153; AC05-84OR21400
• OSTI ID: 10117512
• Report Number(s): GA-A-21043; CONF-920930-15; ON: DE93004909
• Resource Relation: Conference: 17. symposium on fusion technology (SOFT-17),Rome (Italy),14-18 Sep 1992; Other Information: PBD: Sep 1992
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
NON-INDUCTIVE CURRENT DRIVE
DESIGN
ECR HEATING
ANTENNAS
CURRENT-DRIVE HEATING
700460
700350
HEATING AND FUELING SYSTEMS
FUELS
PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS