THE 8 MW LOWER HYBRID "ELECTRON MODE" SYSTEM FOR THE ADDITIONAL HEATING OF THE PLASMA OF THE FTU TOKAMAK
Since Workshop Phase II on the FTU project (January 1983), the understanding of the basic physics of Lower Hybrid (LH) Heating and Current Drive (CD) methods has been improved. The "Electron Mode" regime of LH Heating has been studied and experimentally tested, especially the relation between frequency and density limit. The decision to build a CD system on TORE SUPRA was taken. The Lower Hybrid "Electron Mode" Heating (frequency: 8 GHz), was chosen to heat the plasma of the FTU Tokamak. The RF power (8 MW at 8 GHz) will be produced by 16 gyrotron oscillators (500 kW unit power) feeding 16 grill couplers. The dc power supplies will be modularly built. The transmission lines between the generators and the grills will be circular oversized waveguides, each grill will consist of an 8x8 matrix of rectangular waveguides pressurized and terminated by thick alumina windows. Gyrotron availability has been verified. For grill couplers a prototype structure and ceramic windows are being produced. The Microwave mode converters and power dividers for the transmission system prototypes are being built. An 8 GHz, 25 kW cw test bench for microwave components has been commissioned.
Bibliographic Reference: WRITE TO SERVIZIO STUDI E DOCUMENTAZIONE - ENEA, CENTRO RICERCHE ENERGIA FRASCATI, C.P. 65 - 00044 FRASCATI, ROMA (ITALY), MENTIONING REPORT RT/FUS/85/12, 1985
Record Number: 1989126015900 / Last updated on: 1989-03-01
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