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A lower hybrid current drive (LHCD) system has been developed for current profile control of advanced tokamak experiments on Alcator C-Mod. LHCD along with Ion Cyclotron Radio Frequency (ICRF) heating will be used to develop regimes with high confinement, high betan and high bootstrap fraction and extend them to quasi-steady-state conditions. This paper will describe the commissioning and initial...
We have developed a compact, mass-producible probe inserted into two holes 1/4 wavelength apart in the narrow side of the reduced height waveguides used in the lower hybrid current drive (LHCD) system. The probe consists of two magnetic loops and branch coupler mounted directly on a single microstrip circuit board, thereby greatly reducing the physical size of the probe. The transmission from magnetic...
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