Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-02-29

AUTHORS

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

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. More... »

PAGES

360-372

References to SciGraph publications

  • 1990-03. Gyrotrons for ECH applications in JOURNAL OF FUSION ENERGY
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10762-008-9333-1

    DOI

    http://dx.doi.org/10.1007/s10762-008-9333-1

    DIMENSIONS

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