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

doi:10.1088/0029-5515/43/11/018

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

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

15 Citations (Scopus)

Abstract

The influence of reflections on the operation of the 2MW, CW 170 GHz coaxial cavity gyrotron oscillating in the TE_{34, 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 language	English
Pages (from-to)	1454-1457
Number of pages	4
Journal	Nuclear Fusion
Volume	43
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/43/11/018
Publication status	Published - 1 Nov 2003
MoE publication type	A1 Journal article-refereed

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

abstract = "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.",

author = "Airila, {M. I.} and O. Dumbrajs and P. K{\aa}ll and B. Piosczyk",

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T1 - Influence of reflections on the operation of the 2 MW, CW 170 GHz coaxial cavity gyrotron for ITER

AU - Airila, M. I.

AU - Dumbrajs, O.

AU - Kåll, P.

AU - Piosczyk, B.

PY - 2003/11/1

Y1 - 2003/11/1

N2 - 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.

AB - 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.

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JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 11

ER -

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

Abstract

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