ECH by FEL and gyrotron sources on the Microwave Tokamak Experiment (MTX) tokamak

Conference · Thu Aug 09 04:00:00 EDT 1990

OSTI ID:6780127

Stallard, B W; Turner, W C; Allen, S L; Byers, J A; Felker, B; Fenstermacher, M E; Ferguson, S W; Hooper, E G; Thomassen, K I; Throop, A L ^[1]; Makowski, M A ^[2]

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1. Lawrence Livermore National Lab., CA (USA)
2. TRW, Inc., Redondo Beach, CA (USA)

The Microwave Tokamak Experiment (MTX) at LLNL is studying the physics of intense pulse ECH is a high-density tokamak plasma using a microwave FEL. Related technology development includes the FEL, a windowless quasi-optical transmission system, and other microwave components. Initial plasma experiments have been carried out at 140 GHz with single rf pulses generated using the ETA-II accelerator and the ELF wiggler. Peak power levels up to 0.2 GW and pulse durations up to 10 ns were achieved for injection into the plasma using as untapered wiggler. FEL pulses were transmitted over 33 m from the FEL to MTX using six mirrors mounted in a 50-cm-diam evacuated pipe. Measurements of the microwave beam and transmission through the plasma were carried out. For future rapid pulse experiments at high average power (4 GW peak power, 5kHz pulse rate, and {bar P} > 0.5 MW) using the IMP wiggler with tapered magnetic field, a gyrotron (140 GHz, 400 kW cw or up to 1 MW short pulse) is being installed to drive the FEL input or to directly heat the tokamak plasma at full gyrotron power. Quasi-optic techniques will be used to couple the gyrotron power. For direct plasma heating, the gyrotron will couple into the existing mirror transport system. Using both sources of rf generation, experiments are planned to investigate intense pulse absorption and tokamak physics, such as the ECH of a pellet-fueled plasma and plasma control using localized heating. 12 refs., 9 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6780127
• Report Number(s): UCRL-JC-104573; CONF-900918--6; ON: DE91000286
• 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
AMPLIFIERS
BEAM PROFILES
BEAM TRANSPORT
CLOSED PLASMA DEVICES
ECR HEATING
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTRONIC EQUIPMENT
EQUIPMENT
FREE ELECTRON LASERS
HEATING
HIGH-FREQUENCY HEATING
LASERS
MAGNETS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MICROWAVE POWER TRANSMISSION
PELLET INJECTION
PLASMA HEATING
POWER TRANSMISSION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WIGGLER MAGNETS