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Title: Design and High-Power Test of an Internal Coupler to HE11 Mode in Corrugated Waveguide for High-Power Gyrotrons

Journal Article · · IEEE Transactions on Electron Devices
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [3]; ORCiD logo [3];  [4]
  1. Calabazas Creek Research, Inc., San Mateo, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Calabazas Creek Research, Inc., San Mateo, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Dymenso LLC, San Francisco, CA (United States)
+ Show Author Affiliations

Gyrotrons produce power in high-order, transverse electric modes that are typically converted to a Gaussian beam inside the tube. In fusion plasma heating applications, the power is transmitted through a diamond window to an external mirror optical unit where it is coupled into an HE11 mode in corrugated waveguide. A new coupler is described that couples the cavity RF power directly into corrugated waveguide inside the gyrotron. A high power gyrotron with the improved coupler was tested using 1-MW, 3-μs pulses and demonstrated equivalent power and efficiency as a traditional coupler with HE11 mode output in corrugated waveguide. In addition, higher HE11 mode purity was achieved at the gyrotron output.

Research Organization:
Calabazas Creek Research, Inc., San Mateo, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
FG02-05ER84181
OSTI ID:
1774087
Journal Information:
IEEE Transactions on Electron Devices, Vol. 65, Issue 6; ISSN 0018-9383
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

References (14)

Design and testing of an internal mode converter for a 1.5 MW, 110 GHz gyrotron with a depressed collector conference September 2009
Surface integral equation analysis of quasi-optical launchers journal June 2002
Mode Content Determination of Terahertz Corrugated Waveguides Using Experimentally Measured Radiated Field Patterns journal June 2012
Experimental Study of the Start-Up Scenario of a 1.5-MW, 110-GHz Gyrotron journal April 2013
Experimental Results for a Pulsed 110/124.5-GHz Megawatt Gyrotron journal May 2014
Novel Numerical Method for the Analysis and Synthesis of the Fields in Highly Oversized Waveguide Mode Converters journal July 2009
Use of Huygens’ principle for analysis and synthesis of the fields in oversized waveguides journal May 2006
1 MW and long pulse operation of Gaussian beam output gyrotron with CVD diamond window for fusion devices journal January 2001
A Numerical Synthesis Method for Hybrid-Type High-Power Gyrotron Launchers journal March 2017
Controllability Study of Propagating Mode Content by an Angle-Adjustable Mirror of a Miter-Bend in EC H&CD Transmission Line journal December 2016
Simple Correctors for Elimination of High-Order Modes in Corrugated Waveguide Transmission Lines journal January 2014
Recent Advances in the Worldwide Fusion Gyrotron Development journal March 2014
110 GHz gyrotron with a built-in high-efficiency converter journal May 1992
Minimization of Diffraction Losses in Big Gaps of Multi-Mode Waveguides journal June 2005

Cited By (4)

Laser-driven semiconductor switch for generating nanosecond pulses from a megawatt gyrotron journal April 2019
Development of high power gyrotrons for advanced fusion devices journal April 2019
Measurement of Dielectric Multipactor Thresholds at 110 GHz journal October 2019
To the theory of gyrotrons with confocal resonators journal May 2019

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
corrugated waveguide
gyrotron
HE11 mode
quasi-optical (QO) internal coupler