Alcator C-Mod ICRF antenna and matching circuit

Conference · Sat Jul 01 00:00:00 EDT 1989 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6508792

Golovato, S N; Porkolab, M; Takase, Y; Holcomb, H L ^[1]

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1. M. I. T. Plasma Fusion Center, Cambridge, MA (USA)

Alcator C-mod will be a compact, high field, high density, divertor tokamak. Two FMIT transmitters will supply 4 MW of power in 1 sec pulses at 80 MHz for ICRF heating. Fast wave minority heating experiments are planned in D({sup 3}He) at 8 T and D(H) at 5.5 T. The first antenna will have a single current strap inside a box structure, which will be movable radially. The antenna will be inserted through a side port, making the rf power density on the antenna surface {similar to}2 kW/cm{sup 2} at 2 MW. the antenna will be center-trapped for mechanical strength and have a double layer Faraday screen tilted along the field lines. The antenna geometry was chosen to maximize power coupling assuming voltage-limited operation. A wide antenna with slotted box sides appears the best design, and 10 {Omega} of loading is required to couple 2 MW of power at a voltage limit of 40 kV. Matching is achieved by choice of the drive point to a resonant circuit formed by the antenna and a loop of transmission line outside of the vacuum and by tuning elements in the transmission line to the transmitter.

• OSTI ID: 6508792
• Report Number(s): CONF-8905120-; CODEN: APCPC; TRN: 90-032514
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 190:1; Conference: 8. topical conference on radio frequency power in plasmas, Irvine, CA (USA), 1-3 May 1989; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ANTENNAS
DESIGN
HOT PLASMA
ICR HEATING
LANGMUIR PROBE
PLASMA DIAGNOSTICS
CLOSED PLASMA DEVICES
ELECTRIC PROBES
ELECTRICAL EQUIPMENT
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
PLASMA
PLASMA HEATING
PROBES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
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