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Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment

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Abstract

The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE02 gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE11 + TM11), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations. The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.

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Authors and Affiliations

  1. HSX Plasma Laboratory, University of Wisconsin-Madison, Madison, WI, 53706, USA

    J. W. Radder, K. M. Likin, F. S. B. Anderson & D. T. Anderson

  2. Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI, 53715, USA

    J. W. Radder

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  1. J. W. Radder
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  2. K. M. Likin
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  3. F. S. B. Anderson
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  4. D. T. Anderson
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Correspondence to J. W. Radder.

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Radder, J.W., Likin, K.M., Anderson, F.S.B. et al. Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment. Int J Infrared Milli Waves 29, 360–372 (2008). https://doi.org/10.1007/s10762-008-9333-1

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  • DOI: https://doi.org/10.1007/s10762-008-9333-1

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