Gyrotron power balance based on calorimetric measurements in the DIII-D ECH system

Author

Gorelov, I.A. ; Lohr, J.M. ; Baity, F.W., Jr. ; Cahalan, P. ; Callis, R.W. ; Ponce, D. ; Chiu, H.K.

Author_Institution

Gen. Atomics, San Diego, CA, USA

fYear

2003

fDate

14-17 Oct. 2003

Firstpage

546

Lastpage

548

Abstract

A powerful microwave system operating at the second harmonic of the electron cyclotron frequency on the DIII-D tokamak was upgraded up to six assemblies of 110 GHz gyrotrons in 2003. Three Gycom gyrotrons nominally generate 750 kW for 2 s pulses, with the pulse length limit resulting from the peak temperature allowed on the boron nitride rf output window. Three Communications and Power Industries (CPI) gyrotrons with diamond windows have been recently installed and have been tested to 0.9-1.0 MW for 5 s pulses. Heat loading on internal parts of the gyrotrons, the matching optics unit and the dummy loads is measured calorimetrically. This paper discusses the calorimetry system and calorimetric measurements of gyrotron performance.

Keywords

Tokamak devices; calorimetry; gyrotrons; plasma radiofrequency heating; plasma temperature; plasma toroidal confinement; 0.9 to 1.0 MW; 110 GHz; 2 s; 5 s; 750 kW; Communications and Power Industries gyrotrons; DIII-D ECH system; DIII-D tokamak; Gycom gyrotrons; boron nitride rf output window; calorimetric measurements; calorimetry system; diamond windows; dummy loads; electron cyclotron frequency; gyrotron performance; gyrotron power balance; heat loading; matching optics unit; peak temperature; powerful microwave system; pulse length limit; second harmonic; Assembly systems; Cyclotrons; Electromagnetic heating; Electrons; Frequency; Gyrotrons; Power measurement; Power system harmonics; Pulse generation; Tokamaks;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 2003. 20th IEEE/NPSS Symposium on

Print_ISBN

0-7803-7908-X

Type

conf

DOI

10.1109/FUSION.2003.1426705

Filename

1426705