A 1-Megawatt CW RF Power Source for 80 MHz

Fazio, M.V.; Hoffert, W. J.; Patton, Robert D.; Sutherland, Robert

doi:10.1109/tns.1981.4331954

“…1 have the compact cylindrical design developed for the Fusion Materials Irradiation Facility (FMIT) several years ago by the Continental Electronics Corporation (CEC) [6]. This compact design was maintained when the original 600kW-cw, single-frequency 80 MHz FMIT design, was modified to tune over a 40-80MHz frequency range at 1.5MW output power, under a contract with Oak Ridge National Laboratory, and when further modified by Princeton Plasma Physics Laboratory to provide >2MW for the TFTR ICRF system.…”

Section: Cavity/tube Configuration Of the Transmittersmentioning

confidence: 99%

RF Sources for the ITER Ion Cyclotron Heating and Current Drive System

Hosea¹,

Brunkhorst²,

Fredd³

et al. 2005

0

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Abstract-The RF source requirements for the ITER ion cyclotron (IC) heating and current drive system are very challenging -20 MW CW power into an antenna load with a VSWR of up to 2 over the frequency range of 35 -65 MHz. For the two present antenna designs under consideration, 8 sources providing 2.5 MW each are to be employed. For these sources, the outputs of two final power amplifiers (FPAs), using the high power CPI 4CM2500KG tube, are combined with a 180° hybrid combiner to easily meet the ITER IC source requirements -2.5 MW is supplied at a VSWR of 2 at ~ 70% of the maximum tube power available in class B operation. The cylindrical cavity configuration for the FPAs is quite compact so that the 8 combined sources fit into the space allocated at the ITER site with room to spare. The source configuration is described in detail and its projected operating power curves are presented. Although the CPI tube has been shown to be stable under high power operating conditions on many facilities, a test of the combined FPA source arrangement is in preparation using existing high power 30 MHz amplifiers to assure that this configuration can be made robustly stable for all phases at a VSWR up to 2. The possibility of using 12 sources to feed a suitably modified antenna design is also discussed in the context of providing flexibility for specifying the final IC antenna design.

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High frequency, high power ICRF source for fusion plasmas

Mohamed,

Ridzon,

Garcia

et al. 2023

24th Topical Conference on Radio-Frequency Power in Plasmas

1

0

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RF Sources for the ITER Ion Cyclotron Heating and Current Drive System

Hosea

¹

,

Brunkhorst

²

,

Fredd

³

et al. 2005

21st IEEE/NPS Symposium on Fusion Engineering SOFE 05

0

View full text Add to dashboard Cite

Abstract-The RF source requirements for the ITER ion cyclotron (IC) heating and current drive system are very challenging -20 MW CW power into an antenna load with a VSWR of up to 2 over the frequency range of 35 -65 MHz. For the two present antenna designs under consideration, 8 sources providing 2.5 MW each are to be employed. For these sources, the outputs of two final power amplifiers (FPAs), using the high power CPI 4CM2500KG tube, are combined with a 180° hybrid combiner to easily meet the ITER IC source requirements -2.5 MW is supplied at a VSWR of 2 at ~ 70% of the maximum tube power available in class B operation. The cylindrical cavity configuration for the FPAs is quite compact so that the 8 combined sources fit into the space allocated at the ITER site with room to spare. The source configuration is described in detail and its projected operating power curves are presented. Although the CPI tube has been shown to be stable under high power operating conditions on many facilities, a test of the combined FPA source arrangement is in preparation using existing high power 30 MHz amplifiers to assure that this configuration can be made robustly stable for all phases at a VSWR up to 2. The possibility of using 12 sources to feed a suitably modified antenna design is also discussed in the context of providing flexibility for specifying the final IC antenna design.

show abstract

A 1-Megawatt CW RF Power Source for 80 MHz

Cited by 4 publications

References 0 publications

RF Sources for the ITER Ion Cyclotron Heating and Current Drive System

RF Sources for the ITER Ion Cyclotron Heating and Current Drive System

High frequency, high power ICRF source for fusion plasmas

RF Sources for the ITER Ion Cyclotron Heating and Current Drive System

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