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Abstract: This paper describes the design of a large sized diamond window for 1MW, 170GHz gyrotron. The diameter and the thickness of the diamond window are 80mm and 1.482mm, respectively, whose edge is directly cooled by water. The CST microwave studio has been used for the S-parameter, and finite element analysis code ANSYS has been used for the thermal and the structural simulation. The return loss (S 11) and insertion loss (S 21) of the 170GHz gyrotron window have been found −39.80dB and −0.011dB, respectively. The thermal and structural analysis of RF window the 397K temperature at disk center and maximum displacement 0.01mm has been found in the window disk during the thermal analysis. [Copyright &y& Elsevier]

Abstract: The design of the interaction cavity of a 170 GHz gyrotron operating in the TE34,10 mode is presented in this article. An in-house developed code GCOMS and Particle-in-Cell (PIC) code MAGIC are used for the mode selection and beam–wave interaction simulations, respectively. The cold cavity analysis and beam–wave interaction computation are carried out to analyze the eigenmode and output power, respectively. A thorough parametric analysis of the interaction cavity geometry and electron beam parameters is also carried out with respect to the output power and frequency. The results show the capability of the interaction cavity, designed for the TE34,10 mode, to produce more than 1 MW of RF power of a gyrotron at the operating frequency of 170.03 GHz. [Copyright &y& Elsevier]