Diplexers for power combination and switching in high power ECRH systems

Alex Bruschi, Volker Erckmann, Walter Kasparek, Michael I. Petelin, Manfred Thumm, William Bin, Sante Cirant, Ocleto D'Arcangelo, Frank Hollmann, Lev Lubyako, Frank Noke, Burkhard Plaum, Frank Purps, Hartmut Zohm

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16 Citations (Scopus)


Electron Cyclotron Resonance Heating (ECRH) systems for next step large fusion-devices operate at a Continuous Wave (CW) power well beyond 10 MWgenerated by a large number of gyrotrons with typically 1 MW power per unit. The combination of the power of two (or more) gyrotrons and switching of the power between different launchers for different physics applications is an attractive feature for such systems. The combination of beams fromdifferent gyrotrons would reduce the number of transmission lines and the requirements on port space. Fast switching between two antennas synchronously with the Magneto-Hydro Dynamic (MHD) modes frequency would increase the efficiency of mode stabilization. Both combination and switching as well as power sharing between different ports can be performed with high-power four-port diplexers using small frequency differences or small frequency-shift keying of the gyrotrons, respectively. Fast directional switches (FADIS) and beam combiners (BC) can be designed on the basis of different physical mechanisms: some selected design variants were investigated and the results are presented. Considerations on the integration of FADIS/BC's into large ECRH systems and their use in test arrangements are presented. © 2010 IEEE.
Original languageEnglish
Article number5460918
Pages (from-to)1427 - 1438
Number of pages12
JournalIEEE Transactions on Plasma Science
Issue number6 PART 1
Publication statusPublished - Jun 2010
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Bruschi, A., Erckmann, V., Kasparek, W., Petelin, M. I., Thumm, M., Bin, W., ... Zohm, H. (2010). Diplexers for power combination and switching in high power ECRH systems. IEEE Transactions on Plasma Science, 38(6 PART 1), 1427 - 1438. [5460918]. https://doi.org/10.1109/TPS.2010.2047658