Traditional vs. advanced Bragg reflectors for oversized circular waveguide

•A mode-matching code is applied to electrically large Bragg reflectors.•Traditional and advanced distributed reflectors are compared.•The traditional mirror has larger bandwidth and lower ohmic losses.•The advanced mirror is shorter. This paper compares two types of distributed Bragg reflector, bas...

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Bibliographic Details
Published in:Fusion engineering and design 2017-11, Vol.123, p.477-480
Main Authors: Ceccuzzi, S., Doria, A., Gallerano, G.P., Ravera, G.L., Spassovsky, I., Ginzburg, N.S., Glyavin, M. Yu, Peskov, N. Yu, Savilov, A.V.
Format: Article
Language:English
Subjects:
Backward waves
Bragg reflectors
CARM
Circular waveguides
Copper
Corrugated waveguide
Cyclotron resonance
Design optimization
Distributed Bragg reflector
Electromagnetics
Fusion
Heating
Oversized waveguide
Particle accelerators
Power supply
Reflectance
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Summary:•A mode-matching code is applied to electrically large Bragg reflectors.•Traditional and advanced distributed reflectors are compared.•The traditional mirror has larger bandwidth and lower ohmic losses.•The advanced mirror is shorter. This paper compares two types of distributed Bragg reflector, based on the periodic wall perturbation of an oversized circular waveguide. The first type is a traditional mirror, where wall ripples with a period of half a guided wavelength for the working mode couple forward and backward waves. The other type is an advanced reflector with a ripple period of about a guided wavelength, exploiting an intermediate conversion into a quasi-cutoff mode. The design of both reflectors has been optimized with a mode matching code to deliver a reflectivity >96% for the TE5,3 mode at 250GHz and a power to gun
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2017.02.059