Alcator C-Mod ICRF antenna and matching circuit

Conference · Sat Jul 01 04:00:00 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--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 190:1
• Country of Publication: United States
• Language: English

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