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Title: Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide

Abstract

A cylindrical waveguide with a mode converter transforms a whispering gallery mode from a gyrotron cylindrical waveguide with a helical cut launch edge to a quasi-Gaussian beam suitable for conveyance through a corrugated waveguide. This quasi-Gaussian beam is radiated away from the waveguide using a spiral cut launch edge, which is in close proximity to a first mode converting reflector. The first mode converting reflector is coupled to a second mode converting reflector which provides an output free-space HE11 mode wave suitable for direct coupling into a corrugated waveguide. The radiated beam produced at the output of the second mode converting reflector is substantially circular.

Inventors:
Issue Date:
Research Org.:
CALABAZAS CREEK RESEARCH, INC. San Mateo, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1372651
Patent Number(s):
9715988
Application Number:
14/624,245
Assignee:
CALABAZAS CREEK RESEARCH, INC.
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01P - WAVEGUIDES
DOE Contract Number:  
FG02-05ER84181
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Feb 17
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Neilson, Jeffrey M. Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide. United States: N. p., 2017. Web.
Neilson, Jeffrey M. Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide. United States.
Neilson, Jeffrey M. Tue . "Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide". United States. https://www.osti.gov/servlets/purl/1372651.
@article{osti_1372651,
title = {Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide},
author = {Neilson, Jeffrey M.},
abstractNote = {A cylindrical waveguide with a mode converter transforms a whispering gallery mode from a gyrotron cylindrical waveguide with a helical cut launch edge to a quasi-Gaussian beam suitable for conveyance through a corrugated waveguide. This quasi-Gaussian beam is radiated away from the waveguide using a spiral cut launch edge, which is in close proximity to a first mode converting reflector. The first mode converting reflector is coupled to a second mode converting reflector which provides an output free-space HE11 mode wave suitable for direct coupling into a corrugated waveguide. The radiated beam produced at the output of the second mode converting reflector is substantially circular.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {7}
}

Works referenced in this record:

Couplers for extracting RF power from a gyrotron cavity directly into fundamental mode waveguide
patent, May 1991


Compact waveguide converter apparatus
patent, July 1991


Mode converter and gyrotron tube provided with mode converter for converting mode of millimeter waves
patent-application, February 2002


Continuous-Wave Operation of a Frequency-Tunable 460-GHz Second-Harmonic Gyrotron for Enhanced Nuclear Magnetic Resonance
journal, June 2010