Alcator C-Mod ICRF antenna and matching circuit

Conference · Thu Jun 01 00:00:00 EDT 1989

DOI:https://doi.org/10.1063/1.38494· OSTI ID:5970847

Golovato, S. N.; Porkolab, M.; Takase, Y.; Holcomb, H. L.

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 /approximately/2 kW/cm/sup 2/ at 2 MW. The antenna will be center-tapped 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. 6 refs., 4 figs.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (USA). Plasma Fusion Center
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5970847
• Report Number(s): DOE/ET/51013-266; PFC/CP-89-2; CONF-8905120-19; ON: DE89014858
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
ALCATOR DEVICE
ANTENNAS
CLOSED PLASMA DEVICES
DESIGN
DIVERTORS
ELECTRICAL EQUIPMENT
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
PLASMA DIAGNOSTICS
PLASMA HEATING
POWER TRANSMISSION LINES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES