A Compact Two-Frequency Notch Filter for Millimeter Wave Plasma Diagnostics

Sensitive millimeter wave diagnostics in magnetic confinement plasma fusion experiments need protection from gyrotron stray radiation in the plasma vessel. Modern electron cyclotron resonance heating (ECRH) systems take advantage of multi-frequency gyrotrons. This means that the frequency band of so...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2020-07, Vol.41 (7), p.741-749
Main Authors: Wagner, D., Kasparek, W., Leuterer, F., Monaco, F., Ruess, T., Stober, J., Thumm, M.
Format: Article
Language:English
Subjects:
Classical Electrodynamics
Cyclotron resonance
Cyclotron resonance devices
Electrical Engineering
Electron cyclotron resonance
Electronics and Microelectronics
Engineering
Frequencies
Insertion loss
Instrumentation
Millimeter waves
Notch filters
Plasma diagnostics
Waveguides
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Summary:Sensitive millimeter wave diagnostics in magnetic confinement plasma fusion experiments need protection from gyrotron stray radiation in the plasma vessel. Modern electron cyclotron resonance heating (ECRH) systems take advantage of multi-frequency gyrotrons. This means that the frequency band of some millimeter wave diagnostics contains more than one narrow-band gyrotron-frequency line, which needs to be effectively suppressed. A compact standard waveguide notch filter based on coupled waveguide resonators with rectangular cross-section is presented which can provide very high suppression of several gyrotron frequencies and has low insertion loss of the passband.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-020-00701-6