Design of Rectangular Radio Frequency Cavity for Miniature Multibeam Klystron

Singh, AK and Bandyopadhyay, AK and Joshi, LM and Kant, D and Kumar, B and Meena, R (2012) Design of Rectangular Radio Frequency Cavity for Miniature Multibeam Klystron. 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

This paper is concerned with the design of rectangular radio frequency (RF) cavities for a miniature multiple beam Klystron. The proposed multiple beam klystron will have four beamlets, each carries 64mA current. The RF cavities under design will be compatible with a multiple beam electron gun under development in CEERI. This work is in continuation of the work reported in the previous paper [1] where design of the cylindrical cavity was presented. The possibility of using rectangular cavities instead of cylindrical ones has been explored in this work and a comparison of their performance has been done. The rectangular cavity has been designed to match the RF characteristics with that of cylindrical cavity designed earlier. The rectangular cavity designed has following advantages: a) Fabrication of rectangular cavity is easier compared to cylindrical counterpart of it. b) Coupling of rectangular waveguide with rectangular cavity is easier compared to the case of cylindrical one. The RF cavities play an important role in deciding the RF performance of the tube, such as its gain, bandwidth, efficiency etc. Eventually proper choice of cavity parameters including its resonant frequency, quality factor, shunt resistance which depend on the geometry of the cavity are of utmost importance to decide the ultimate performance of the Klystron. The RF cavity geometry of a four beam Klystron working in J-band frequency range has been optimized for its frequency, R/Q etc. The shape and size of the central conductor and the nose cones have been optimized to get the desired performance of the RF cavity. A step impedance transformer is also designed to check the symmetric coupling over all the beams in the input and output sections at the design frequency. The state of art electromagnetic simulation tool CST microwave studio has been used for the design and operation of the cavity. Different cavity parameters such as the quality factor, shunt impedance, etc. have been estimated with the help of the simulation tool.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Multibeam Klystron, Step Impedance Transformer, Slot Coupling
Subjects:	?? TK ?? Microwave Tubes > Klystrons
Divisions:	Microwave Tubes
Depositing User:	Mr. Jitendra Nath Bajpai
Date Deposited:	20 May 2013 11:32
Last Modified:	20 May 2013 11:32
URI:	http://ceeri.csircentral.net/id/eprint/41

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