Progress on a 100W Ka Band Helix TWT

This paper elaborates on the design aspects of the first prototype of a 26–40 GHz wideband helix traveling wave tube (TWT) being developed at CPI-TMD Technologies Limited. The TWT is designed to achieve an output power exceeding 100 watts throughout the specified frequency range. A preliminary design has been accomplished for both the radio frequency (RF) circuit, which encompasses the loaded helical slow wave structure, couplers and windows, as well as the beam optics, including components such as the electron gun, magnetics and collector. The complexities faced in developing such a high-frequency helix TWT are thoroughly examined, accompanied by a design that is deemed practical for manufacturing purposes. Furthermore, the development of the beam stick and the slow wave structure for the initial prototype TWT is in progress.