14.2: Operation of a 1.5 MW, 110 GHz gyrotron with an advanced internal mode converter

Author

Tax, David S. ; Choi, Eunmi M. ; Hidaka, Yoshiteru ; Mastovsky, Ivan ; Shapiro, Michael A. ; Sirigiri, Jagadishwar R. ; Temkin, Richard J. ; Torrezan, Antonio C. ; Neilson, Jeff

Author_Institution

Plasma Sci. & Fusion Center, Massachusetts Inst. of Technol., Cambridge, MA, USA

fYear

2010

fDate

18-20 May 2010

Firstpage

313

Lastpage

314

Abstract

We present experimental results on the operation of a 1.5 MW, 110 GHz, 3 μs pulsed gyrotron with an advanced internal mode converter (IMC). We have designed and installed an IMC that uses smooth curved mirrors rather than mirrors with phase correcting surfaces which are more sensitive to alignment. Hot and cold test experiments of the new IMC show over 95% Gaussian mode content in the output beam. We also explore the after cavity interaction (ACI) and study its effect on reducing the gyrotron´s overall efficiency. Results show that the elimination of the ACI could yield as much as an 11% increase in efficiency.

Keywords

Gaussian processes; gyrotrons; vibrational modes; Gaussian mode content; advanced internal mode converter; after cavity interaction; frequency 110 GHz; gyrotron; power 1.5 MW; smooth curved mirrors; Antenna measurements; Cyclotrons; Dynamic range; Electron beams; Gyrotrons; Heating; Mirrors; Phase measurement; Pulse measurements; Testing; after cavity interaction; electron cyclotron heating; gyrotron; internal mode converter; nuclear fusion;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2010 IEEE International

Conference_Location

Monterey, CA

Print_ISBN

978-1-4244-7098-3

Type

conf

DOI

10.1109/IVELEC.2010.5503425

Filename

5503425