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 TE5,3mode at 250 GHz and a power to gun <0.5% in copper waveguides with a diameter of 15 mm. Such specifications are relevant to the upstream mirror of a cyclotron auto-resonance maser under development at ENEA Frascati. The two types of reflector are compared in terms of mechanical dimensions, reflectivity, bandwidth and losses.
All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering
- Materials Science(all)
- Civil and Structural Engineering
- Mechanical Engineering
Ceccuzzi, S., Doria, A., Gallerano, G. P., Ravera, G. L., Spassovsky, I., Ginzburg, N. S., Glyavin, M. Y., Peskov, N. Y., & Savilov, A. V. (2017). Traditional vs. advanced Bragg reflectors for oversized circular waveguide. Fusion Engineering and Design, 123, 477 - 480. https://doi.org/10.1016/j.fusengdes.2017.02.059