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High Efficiency RF Sources for IFMIF and CLIC

High Efficiency RF Sources for IFMIF and CLIC. Richard Carter, Carl Beard, Igor Syratchev, Chris Lingwood. International Fusion Materials Irradiation Facility (IFMIF). Two 40 MeV, 125 mA, deuteron cw linear accelerators Total facility availability of 70% or more

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High Efficiency RF Sources for IFMIF and CLIC

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  1. High Efficiency RF Sources for IFMIF and CLIC Richard Carter, Carl Beard, Igor Syratchev, Chris Lingwood CI All Hands Meeting 29 March 2007

  2. International Fusion Materials Irradiation Facility(IFMIF) • Two 40 MeV, 125 mA, deuteron cw linear accelerators • Total facility availability of 70% or more • Thirteen 1MW cw, 175 MHz, RF sources for each accelerator • Baseline design: Thales TH628 Diacrode CI All Hands Meeting 29 March 2007

  3. Inductive Output Tube (IOT) • Electron bunches formed by a gridded gun • RF power extracted by a cavity resonator • State of the Art CI All Hands Meeting 29 March 2007

  4. Compact efficient oscillator Can be phase locked State of the art Magnetron CI All Hands Meeting 29 March 2007

  5. Comparison of RF power sources CI All Hands Meeting 29 March 2007

  6. CI All Hands Meeting 29 March 2007

  7. Multiple Beam Klystron Design Issues • Klystron efficiency increases as perveance decreases • MBK achieves high efficiency without very high voltage • Optimum number of beams ~ 20 • Studies of alternative cavity designs CI All Hands Meeting 29 March 2007

  8. Cavity Design Options • Cavities • Higher order mode pill-box • Fundamental mode annular • Higher order mode annular • Whispering gallery mode pill-box • Issues • Shunt impedance • Excitation of higher order modes • Monotron oscillations • Multipactor CI All Hands Meeting 29 March 2007

  9. Conclusions • Increasing RF source conversion efficiency is an important research objective for the next generation of accelerators • The Cockcroft Institute is well-placed to contribute to research in this field Acknowledgements This work is supported by: PPARC, Euratom, CERN, Thales Electron Devices CI All Hands Meeting 29 March 2007

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