High-Frequency Transmission Characteristics of Inert Coolant Liquids for High-Power Gyrotron Windows

Author

Yadav, Vandana ; Kumar, Narendra ; Kumar, Ajit ; Singh, Upendra ; Bhattacharya, Rupen ; Deorani, S.C. ; Sinha, Arun Kumar

Author_Institution

Central Electron. Eng. Res. Inst., Council of Sci. & Ind. Res., Pilani, India

Volume

41

Issue

3

fYear

2013

fDate

Mar-13

Firstpage

450

Lastpage

455

Abstract

The frequency response of dielectric properties of coolant liquids used in the gyrotron RF window is measured. FC-40, FC-75, and CCl₄ are considered for the measurements due to their reported application in gyrotron and excellent dielectric properties required for high-power RF transmission. A performance probe kit based on the reflection method is used for measurements in wide frequency range from 200 MHz to 50 GHz. Vector network analyzer (VNA) is used as the RF source as well as receiver. The dielectric constant and loss tangent are calculated directly by using the scattering matrix data obtained from the VNA. Further, ac conductivity and relaxation time are also computed by using measured data of loss tangent and dielectric constant.

Keywords

S-matrix theory; frequency response; gyrotrons; network analysers; permittivity; CCl₄; FC-40; FC-75; RF source; RF transmission; VNA; ac conductivity; dielectric constant; dielectric properties; frequency 200 MHz to 50 GHz; frequency response; gyrotron RF window; high-frequency transmission characteristics; high-power gyrotron windows; inert coolant liquids; loss tangent; performance probe kit; reflection method; relaxation time; scattering matrix data; vector network analyzer; Coolants; Dielectric measurements; Dielectrics; Gyrotrons; Materials; Probes; Radio frequency; Coolant liquid; RF window; dielectric properties; gyrotron;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2013.2243473

Filename

6468114