High power broadband gyro-TWAs operating in terahertz frequency range

Summary form only given. Gyro-devices based on helically corrugated interaction region (HCIR) demonstrated capabilities of high power, high efficiency, high gain and wide frequency band. A HCIR couples two partial modes resonantly and hence generates a operating eigenwave with a near constant group velocity in small axial wavenumber region over a wide frequency band. In this paper the possibility and scalability of the gyrotron travelling wave amplifiers (gyro-TWAs) based on high order HCIRs are discussed for operation in the terahertz range. The beam-wave interactions are analyzed using the dispersion properties of these high order HCIRs and electron beams. Furthermore design and numerical simulation of two gyro-TWAs based on 4- and 5-fold HCIRs, with 3-dB bandwidth of 385-405 GHz and 800-870 GHz, gain 47 and 43 dB, output power 500 W and 50 W respectively, are presented.