A High Efficiency Launcher and Mirror System for Use in a 110 GHZ TE_22,6 Mode Gyrotron

Authors: Perkins, Michael; Cao, Rong; Neilson, Jeffrey; Vernon, Ronald

Source: International Journal of Infrared and Millimeter Waves, Volume 28, Number 3, March 2007 , pp. 207-218(12)

Publisher: Springer

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Abstract:

A four-mirror internal quasi-optical mode converter designed for a CPI gyrotron is discussed. Many improved methods were used in designing the mode converter. The launcher was designed and analyzed using the TOL and Surf3d codes developed by CCR. Mirrors 1 and 2 were designed using analytic surfaces to shape the general wavefront curvature of the beam radiated from the launcher. Mirrors 3 and 4 were iteratively designed using improved techniques that produced smooth mirror surfaces. Good agreement was found between theory and low-power cold-test measurements. The fraction of power coupled between the target Gaussian beam and the output of mirror 4, inferred from measurements, was 0.990. The stray radiation from the internal quasi-optical mode converter, inferred from measurements, was only 1.9% of the total power radiated from the launcher. This resulted in a high overall system efficiency of 97.0%, which is greater than previous designs.

Keywords: Gyrotron; Mode converter; Mirror; Launcher

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10762-007-9200-5

Affiliations: 1: Email: perkins22@llnl.gov

Publication date: 2007-03-01