2 MW, 170 GHz coaxial-cavity short-pulse gyrotron - Investigations on electron beam instabilities and parasitic oscillations

Author

Rzesnicki, T. ; Gantenbein, Gerd ; Illy, Stefan ; Jelonnek, John ; Jin, J. ; Pagonakis, Ioannis Gr ; Piosczyk, B. ; Schlaich, Andreas ; Thumm, Manfred

Author_Institution

Karlsruhe Inst. of Technol. (KIT), Assoc. EURATOM-KIT, Karlsruhe, Germany

fYear

2013

fDate

1-6 Sept. 2013

Firstpage

1

Lastpage

2

Abstract

The development of a 2 MW, 170 GHz short-pulse coaxial-cavity gyrotron pre-prototype for electron cyclotron heating and current drive (ECRH&CD) of magnetically confined plasmas in upcoming fusion devices is in progress at Karlsruhe Institute of Technology (KIT). Significant design modifications have been done recently. First experimental tests of a modified setup show two important unwanted effects. The gyrotron operation is limited by problems, which are occurring in the electron beam. In addition, an excitation of low frequency parasitic oscillations has been observed. The origin for those effects is under study.

Keywords

electron beams; gyrotrons; plasma radiofrequency heating; coaxial cavity gyrotron preprototype; coaxial cavity short pulse gyrotron; electron beam instabilities; electron cyclotron heating; excitation; frequency 170 GHz; fusion devices; gyrotron operation; low frequency parasitic oscillations; magnetically confined plasmas; power 2 mW; Cathodes; Cavity resonators; Electron beams; Electron traps; Gyrotrons; Oscillators; Structural beams;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on

Conference_Location

Mainz

Type

conf

DOI

10.1109/IRMMW-THz.2013.6665751

Filename

6665751