Collector loading during high frequency power modulation

Author

Braune, H. ; Erckmann, V. ; Illy, S. ; Michel, G. ; Noke, F. ; Purps, F.

Author_Institution

EURATOM Assoc., Max-Plank-Inst. fur Plasmaphysik, Greifswald, Germany

fYear

2010

fDate

5-10 Sept. 2010

Firstpage

1

Lastpage

2

Abstract

The high frequency power modulation of cw gyrotrons with an rf-output power up to 1 MW and efficiencies of 35-55 % is limited by collector loading. Two alternative power modulation schemes are commonly applied which show a significant difference in the resulting collector loading. In any case waste power remains in the spent electron-beam and must be dissipated in the gyrotron-collector. Such collectors have strong sophisticated water-cooling systems and the electron-beam strike area is moved on the collector surface by sweeping the magnetic field. The technically less demanding power modulation method unfortunately generates the highest level of collector loading. Different sweep technologies have been developed in order to avoid overheating.

Keywords

cooling; electron beams; gyrotrons; magnetic fields; collector loading; efficiency 35 percent to 55 percent; electron-beam strike area; gyrotrons; high frequency power modulation; magnetic field; water-cooling systems; Frequency modulation; Gyrotrons; Loading; Power generation; Radio frequency; Temperature distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on

Conference_Location

Rome

Print_ISBN

978-1-4244-6655-9

Type

conf

DOI

10.1109/ICIMW.2010.5613028

Filename

5613028