Dielectric Measurements of Coolant Materials used in Gyrotron Window


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Kumar, N and Yadav, V and Singh, U and Kumar, A and Sinha, AK (2013) Dielectric Measurements of Coolant Materials used in Gyrotron Window. In: National Conference on Innovation in Electronics and Communication Engineering (NIECE - 2013), February 22-23, 2013, Jaipur. (Submitted)

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Gyrotron is a high power, high frequency millimeter wave source based on the phenomena called Cyclotron Resonance Maser (CRM) instability occurring during the interaction of the helically moving electrons with RF. Gyrotron lead variety of features such as technological, scientific and industrial applications, mainly for heating of plasmas at nuclear fusion installations and high temperature processing of materials. RF window happens to be the most critical and vulnerable component in any high power microwave/mm wave vacuum device, which limits its power handling capability. The RF loss in the RF window directly depends on the material dielectric properties. Considering the minimum RF losses and maximum RF transmission (ideally 100 %), various low loss dielectric materials, like, BN, Sapphire, AlN, CVD diamond, etc, are explored specifically for the gyrotron applications. Different kinds of window cooling schemes can be adopted depending on the material thermal properties. For 42 GHz, 200 kW gyrotron, double disk sapphire widow with specific coolant liquid is adopted. The dielectric properties of coolant materials play a crucial role in the design and fabrication of RF window. In this article, the results of dielectric properties measurements of different coolant materials such as FC-75, FC-40 and CCl4 are presented and discussed. Figs. 1 and 2 show the measurement results of all three coolant materials up to 50 GHz frequency.

Item Type: Conference or Workshop Item (Paper)
Subjects: ?? TK ??
Microwave Tubes > Gyrotrons
Divisions: Microwave Tubes
Depositing User: Mr. Rohit Singh
Date Deposited: 24 May 2013 06:17
Last Modified: 24 May 2013 06:17
URI: http://ceeri.csircentral.net/id/eprint/10

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