Output System for a 170-GHz/1.5-MW Continuous Wave Gyrotron Operating in the TE_28,12Mode

Abstract

In this paper, design aspects of the output system of a 170-GHz/1.5-MW continuous wave gyrotron operating in the TE 28, 12 mode is presented for testing the latest version of gyrotron design suite (GDS.V3.2014), which has been equipped with new features. The output system has been incorporated and showcased here considering the design aspects of the output system of this specific gyrotron as a case study. A nonlinear up-taper has been designed using a multiobject particle swarm evolutionary algorithm and the design of an advanced dimpledwall launcher is carried out using launcher optimization tool. Single-disk chemical vapor deposition (CVD) diamond and CVD boron nitride windows have been designed to take out the output power. Besides, the reconstruction of the wave phase at different planes outside the tube is calculated by an iterative phase retrieval algorithm. The Gaussian mode content achieved by the launching system is 99.5%. In addition, design of a matching optics unit has also been done considering a very recent approach for off-axis incident beams.Index Terms-Gyrotron design suite (GDS), gyrotrons, mirror synthesis, nonlinear up-taper (NLT), quasi-optical launcher (QOL), RF window.

Implementation of Two Methods for Designing the Profiles of Mirrors in Quasi-Optical Mode Converter for 170 GHZ Transverse Output Gyrotron

“…For the wave beam radiated from the launcher, astigmatism and ellipticity of the beams cannot be well corrected by those mirrors designed as toroidal, ellipsoidal, and paraboloidal surfaces. Besides adding a phase-correcting mirror after the bifocal mirror to reduce ellipticity and astigmatism, as introduced in Section 3, PD method can also be adopted [6,[17][18][19]. The parameters of the required beam can be obtained by: where k is the wave number; w m2 is the beam radius on mirror 2 which is calculated from the beam radiated from mirror 1; w m3 is the beam radius on mirror 3 which is calculated from the ideal Gaussian beam on the window; y m2 and y m3 are the positions of mirror 2 and mirror 3, respectively; w 0out and y 0out are the waist radius and waist position of the required beam respectively.…”

Conceptual design of CFETR ECRH equatorial launcher and upper launcher

“…HVPS which is mainly formed by cathode power supply and body power supply is in charge of power supply for microwave source. Each cathode power supply provides two gyrotrons [8][9][10][11]. PSM structure is chosen in the cathode power supply.…”

Output System of a 42 84 GHz 0.5 MW Dual Regime Gyrotron

“…The beam which we got from the output window is not a perfect Gaussian mode, but we want an almost perfect Gaussian beam. To increase Gaussian mode content of beam and to reduce astigmatism and ellipticity of beam, MOU is used 5 . For the design of such MOUs, one should know the amplitude and phase information of the beam at the mirror positions.…”

“…For the design of such MOUs, one should know the amplitude and phase information of the beam at the mirror positions. The phase of the beam can be obtained iteratively by phase retrieval algorithm 5,6 , or the Irradiance method 7 . The matching optic unit consists of two/ three mirrors that direct the output beam from the window towards the corrugated waveguide transmission line.…”