Coaxial Waveguide for Sheet Beam Gyrotron

Ranjan, OM and Khatun, H and Sinha, AK (2012) Coaxial Waveguide for Sheet Beam Gyrotron. In: National Conference on Recent Trends in Microwave Techniques and Applications ( Microwave - 2012), July 30 - August 1, 2012, S.S. Jain Subodh P.G. College, Jaipur and University of Rajasthan . (Submitted)

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Abstract

Gyrotron is a high power microwave tube, which emits coherent radiation at approximately the electron cyclotron frequency or its harmonics. The gyrotron is widely used in plasma fusions, ECRH heating, industrial heating and material processing. The need for high power, high frequency RF sources for the magnetic fusion research experiments has provided much of the impetus for the development of present day gyro oscillators. The sheet beam gyrotron is basically a gyro-amplifier. The Gaussian RF beam (TEM00) of a conventional gyrotron can be applied as an input for the interaction with a high-current sheet electron beam drifting along an external magnetic field, with the aim of generating an even higher RF power and without the need for the feedback from the walls of any cavity or the resonator. For guiding the TEM wave from the input coupler to the interaction region and from the interaction region to the output coupler, a special type of waveguide will be needed because the hollow rectangular waveguide and the hollow cylindrical waveguide don’t support the TEM-mode propagation. So, in the sheet beam gyrotron, coaxial waveguide can be used as a guiding medium. The cut-off frequency of the coaxial waveguide is zero for the TEM-mode propagation; it means that it allows all frequency signals to pass through it which is another very important advantage of the coaxial waveguide. In this paper, the simulation of the propagation of the TEM wave through the coaxial waveguide has been carried out using MAGIC-3D Software. A wide range of the frequencies and the power had been taken and the graphs of the input and the output power with respect to the time have been plotted using the MAGIC software. Fig.1 shows the 3D Model of the coaxial waveguide of the sheet beam Gyrotron. Fig.2 shows the input and the output power profile of the coaxial waveguide using the MAGIC code.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	?? TK ?? Microwave Tubes > Gyrotrons
Divisions:	Microwave Tubes
Depositing User:	Mr. Jitendra Nath Bajpai
Date Deposited:	20 May 2013 09:17
Last Modified:	20 May 2013 09:17
URI:	http://ceeri.csircentral.net/id/eprint/28

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