Influence of reflections on the operation of the 2 MW, CW 170 GHz coaxial cavity gyrotron for ITER

M. I. Airila, O. Dumbrajs, P. Kåll, B. Piosczyk

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)


The influence of reflections on the operation of the 2MW, CW 170 GHz coaxial cavity gyrotron oscillating in the TE34, 19- mode is studied. In particular, frequency-independent power reflections, e.g. from plasma or some elements of the transmission line, larger than 1% and occurring in a poor phase may lead to oscillation breakdown and should be avoided. Frequency-dependent reflections from a specially designed diamond window influence mode competition, but contract the oscillation region of the operating mode noticeably only under the unrealistic assumption that all reflected power returns to the cavity. The conclusion is that the gyrotron is sufficiently robust against possible negative effects related to reflections.

Original languageEnglish
Pages (from-to)1454-1457
Number of pages4
JournalNuclear Fusion
Issue number11
Publication statusPublished - 1 Nov 2003
MoE publication typeA1 Journal article-refereed


Cite this