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Choi, EunMi
THz Vacuum Electronics and Electrodynamics
Research Interests
  • High power millimeter-wave/THz wave, vacuum electronics, plasma breakdown, electron beams, electromagnetics, microwave/RF engineering

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Accurate identification of whispering gallery mode patterns of gyrotron with stabilized electro-optic imaging system

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Title
Accurate identification of whispering gallery mode patterns of gyrotron with stabilized electro-optic imaging system
Author
Lee, IngeunSawant, AshwiniChoe, MunseokLee, Dong JoonChoi, EunMi
Issue Date
2018-01
Publisher
AMER INST PHYSICS
Citation
PHYSICS OF PLASMAS, v.25, no.1, pp.013116
Abstract
The precise field pattern measurement and analysis of a typical whispering gallery mode excited in a gyrotron are important to understand the interaction physics of the gyrotron. We precisely analyzed the characteristic of a whispering gallery mode, rotating TE6,2 mode, by a photonic-assisted W-band (75-110 GHz) electro-optic imaging measurement system. The whispering gallery mode in the W-band region diverges fast in free space as it propagates from the radiation port. Therefore, scanning the field patterns of a device-under-test should be performed as close as possible to identify the device's characteristics. We successfully accomplished visualizing highly accurate field patterns of a rotating and mixed whispering gallery mode based on the measured electric field magnitude and phase by using dual optical fiber-scale electro-optic (EO) probes. We observed the distorted fields when the typical open-ended waveguide and a general EO probe were used in the extremely near-field zone, whereas a very precise field was measured in a minimally invasive way by the proposed EO probe. The measured mode patterns were quantitatively analyzed by using a cross correlation function and a mode purity equation. This work promises a way to provide accurate electric field information in the generation of the whispering gallery mode in the millimeter and submillimeter regime. Published by AIP Publishing.
URI
https://scholarworks.unist.ac.kr/handle/201301/23277
URL
http://aip.scitation.org/doi/full/10.1063/1.5017558
DOI
10.1063/1.5017558
ISSN
1070-664X
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