Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment |
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| Authors: | J W Radder K M Likin F S B Anderson and D T Anderson |
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| Institution: | (1) HSX Plasma Laboratory, University of Wisconsin-Madison, Madison, WI 53706, USA;(2) Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, WI 53715, USA |
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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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| Keywords: | Electron cyclotron heating Microwave transmission lines Stellarators Quasioptics |
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