• F. Caspers, M. Betz, A. Grudiev
  CERN, Geneva
• H. Sapotta
  University of Applied Sciences Karlsruhe, Karlsruhe

In many par­ti­cle ac­cel­er­a­tors con­sid­er­able amounts of RF power reach­ing the megawatt level are con­vert­ed into heat in dummy loads. After an overview of RF power in the range 200 MHz to 1 GHz dis­si­pat­ed at CERN we dis­cuss sev­er­al de­vel­op­ments that had come up in the past using vac­u­um tube tech­nol­o­gy for RF-DC con­ver­sion. Amongst those the de­vel­op­ments the cy­clotron wave con­vert­er CWC ap­pears most suit­able. With the avail­abil­i­ty of pow­er­ful Schot­tky diodes the solid state con­vert­er as­pect has to be ad­dressed as well. One of the biggest prob­lems of Schot­tky diode based struc­tures is the junc­tion ca­pac­i­ty. GaAs and GaN Schot­tky diodes show a sig­nif­i­cant re­duc­tion of this junc­tion ca­pac­i­ty as com­pared to sil­i­con. Small recten­na type con­vert­er units which had been al­ready de­vel­oped for mi­crowave pow­ered he­li­copters can be used in waveg­uides or with coax­i­al power di­viders.