The RF Source: the Gyrotron

The RF source for the LH Heating and Current Drive System for FTU is a conventional gyrotron with vertical axial output.

The main electrical characteristics of the FTU gyrotron are resumed in the following table:

        Gyrotron Main Characteristics

Cavity Oscillation Mode

TE511

Nominal Output Frequency

8 GHz

Frequency Stability

+ / - 1 MHz

Output Power (TE01)

1.1 MW

Peak Power @ VSWR = 4 : 1

700 kW

Frequency Pulling @ VSWR = 4 : 1

+ / - 2 MHz

Beam Voltage (typ)

84 kV

Beam Current (typ)

27 A

Efficiency

<= 46 %

Gun-anode Voltage (typ)

51 kV

The RF output is through a single disk, alumina (Al2O3) window, edge cooled by water flow.

The gyrotron, with the identification TH 1504, has been designed and developed by Thomson (now Thales) TTE (France) , upon a specific contract with ENEA.


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