Design of high power four-cavity gyroklystrons for linear collider applications

Summary form only given. This article reports the results from a theoretical design of four-cavity 17.1 GHz gyroklystron. The X-band input cavity operates in the TE/sub 011/ mode, while the remaining three cavities (buncher, penultimate and output) operate in the TE/sub 021/ mode, doubling the frequency of the input signal. The simulations show that both very high efficiency and gain of over 43% and 70 dB, respectively, can be realized, using an electron beam with 500 kV voltage, 700 A current, perpendicular-to-parallel velocity ratio of 1.5 and parallel velocity spread of 6.4%. The attained gain at an output power of more than 100 MW (which seems to be experimentally possible, taking into account the above mentioned values of efficiency and electron beam power) would probably permit the application of solid state microwave generators as input signal sources. These generators are cheaper and more stable than the magnetrons used to drive the present gyroklystrons.