MULTI-MODE GENERATOR FOR THE COLD TEST OF BROADBAND QUASI-OPTICAL GYROTRON MODE CONVERTERS D. Wagner 1, M. Thumm 2, G. Gantenbein 2, J. Flamm 2, J. Neilson.

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Presentation transcript:

MULTI-MODE GENERATOR FOR THE COLD TEST OF BROADBAND QUASI-OPTICAL GYROTRON MODE CONVERTERS D. Wagner 1, M. Thumm 2, G. Gantenbein 2, J. Flamm 2, J. Neilson 3, R. Vernon 4 1 MPI für Plasmaphysik, Association EURATOM-IPP, D Garching, Germany 2 Forschungszentrum Karlsruhe, Association EURATOM-FZK, IHM, D Karlsruhe, Germany 3 Calabazas Creek Research, 690 Port Drive, San Mateo, CA , USA 4 University of Wisconsin, Madison, Wisconsin, , USA US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan Outline:- Introduction - Broadband beam excitation - Cavity design - Measurements

US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan INTRODUCTION (1) Testing of quasi-optical mode converters requires the excitation of high-order volume modes at low power levels. Mode converters for advanced multi-frequency gyrotrons need to be efficient for different modes over a wide frequency range Mode generator required for cold tests to excite several modes with high mode purity in this frequency range In our case main modes of interest are: TE GHz TE GHz

INTRODUCTION (2) Principle: (Alexandrov et al., Int. J. Infrared and Millimeter Waves, 13 (1992), pp.1369) caustic waveguide US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

INTRODUCTION (3)  rcrc BB k0k0 kzkz kckc – Field distribution of high-order modes can be decomposed into a spectrum of plane waves – All rays ( ) are tangential to the caustic with radius: – The reflection angles of the rays at the waveguide wall are given by: R z US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

BROADBAND BEAM EXCITATION (1) Gaussian beam excitation using a smooth Gauss horn (output mode mixture app. 86% TE % TE 11 (180°) % TM 11 (180°) + 0.4% TM 12 (180°) ) Linear horn (2 phasing sections) calculated bandwidth   7% center frequency: GHz US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

BROADBAND BEAM EXCITATION (2) Ex.: horn pattern at center frequency (122.5 GHz, at z = 59 mm) US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan calculation measurement

BROADBAND BEAM EXCITATION (3) Lens horn contains 2 cylindrical teflon lenses Designed to generate astigmatic beam at f = GHz with w 01 = 10 mm, w 02 = 33 mm at d 2 = 353 mm Measured lens horn beam at the position of the quasi-parabolic mirror: US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

CAVITY DESIGN (1) Cavity profile optimized for - high output mode purity - high Q US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan (R i /R o =0.44)

CAVITY DESIGN (2) Coupling holes over whole circumference  reduces counter rotation  minimizes re-radiation Calculated frequency dependence of the coupling factor: US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

CAVITY DESIGN (3) Optimum mode separation by appropriate choice of inner conductor radii Calculated eigenvalue spectra (R o =19.65mm) TE 22,6 resonance TE 24,7 resonance US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan o o

CAVITY DESIGN (4) US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan o

MEASUREMENTS (1) Measured frequency response (R i /R o =0.44) Calculated and measured mode pattern (vertical GHz) TE 22,6 US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

CAVITY DESIGN (5) US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan o

MEASUREMENTS (2) Measured frequency response (R i /R o =0.44) Calculated and measured mode pattern (vertical GHz TE 24,7 US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

MEASUREMENTS (3) Measured frequency response (R i /R o =0.435) Calculated and measured mode pattern (vertical GHz TE 24,7 US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

CAVITY DESIGN (6) US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan o

MEASUREMENTS (4) Measured frequency response (R i /R o =0.42) Calculated and measured mode pattern (vertical GHz TE 24,7 US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

MODE GENERATOR SETUP lens horn quasi-parabolic mirror cavity

MEASUREMENTS (5) US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan

CONCLUSIONS US-EU-JPN RF Heating Technology Workshop, September 16-18, 2009, Fukuoka, Japan Mode generator for TE 110 GHz and TE GHz built and tested. First results show clear mode patterns with low counter rotation. Frequency matches design values within 20 MHz. Mode generator shipped to University of Wisconsin.