Design and testing of 200kW/91.2MHz RF amplifier

A 1.5MW ion cyclotron resonance heating (ICRH) system is being developed as an auxiliary heating system for steady state super-conducting tokamak-1 (SST-1) plasma. Different frequencies between 20 and 91.2MHz have been selected to allow second harmonic and minority heating at 1.5 and 3.0T toroidal m...

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Bibliographic Details
Published in:Fusion engineering and design 2007-10, Vol.82 (5-14), p.853-859
Main Authors: Singh, Raghuraj, Mukharjee, Aparajita, Bhattacharya, D.S., Kumar, Rajnish, Srinivas, Y.S.S., Gahlot, Agrajit, Bhardwaj, Anil, Biswas, Prabal, Kadia, Bhavesh R., Jadav, H.M., Bora, D.
Format: Article
Language:English
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Summary:A 1.5MW ion cyclotron resonance heating (ICRH) system is being developed as an auxiliary heating system for steady state super-conducting tokamak-1 (SST-1) plasma. Different frequencies between 20 and 91.2MHz have been selected to allow second harmonic and minority heating at 1.5 and 3.0T toroidal magnetic fields. Various stages of amplifiers will be used to achieve the targeted power output at the above-mentioned frequencies. Two RF generator chains are being used to cover the desired operating frequencies. One is tunable from 20 to 45.6MHz and the other one is fixed at 91.2MHz with 2MHz bandwidth. In the later chain of amplifiers a 20kW amplifier is already tested at 91.2MHz to drive the 200kW stage of the amplifier. Based on tetrode an amplifier for output power of 200kW is selected to avoid expected feedback problems at this power level. The design and testing procedure of 200kW stage will be discussed in this paper.
ISSN:0920-3796
DOI:10.1016/j.fusengdes.2007.07.057