Orbital Angular Momentum (OAM) of Rotating Modes Driven by Electrons in Electron Cyclotron Masers

Ashwini Sawant; Mun Seok Choe; Manfred Thumm; EunMi Choi

doi:10.1038/s41598-017-03533-y

Scientific Reports (Jun 2017)

Orbital Angular Momentum (OAM) of Rotating Modes Driven by Electrons in Electron Cyclotron Masers

Ashwini Sawant,
Mun Seok Choe,
Manfred Thumm,
EunMi Choi

Affiliations

Ashwini Sawant: Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST)
Mun Seok Choe: Department of Physics, Ulsan National Institute of Science and Technology (UNIST)
Manfred Thumm: Institute for Pulsed Power and Microwave Technology (IHM), Karlsruhe Institute of Technology (KIT)
EunMi Choi: Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST)

DOI: https://doi.org/10.1038/s41598-017-03533-y
Journal volume & issue: Vol. 7, no. 1
pp. 1 – 10

Abstract

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Abstract The well-defined orbital angular momentum (OAM) of rotating cavity modes operating near the cutoff frequency excited by gyrating electrons in a high-power electron cyclotron maser (ECM)—a gyrotron—has been derived by photonic and electromagnetic wave approaches. A mode generator was built with a high-precision 3D printing technique to mimic the rotating gyrotron modes for precise low-power measurements and shows clear natural production of higher-order OAM modes. Cold-test measurements of higher-order OAM mode generation promise the realization towards wireless long-range communications using high-power ECMs.

Published in Scientific Reports

ISSN: 2045-2322 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Medicine; Science
Website: https://www.nature.com/srep/

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