A Third Generation Lower Hybrid Coupler
Authors: S. Bernabei, J. Hosea, C. Kung, D. Loesser, J. Rushinski, J.R. Wilson, and R. Parker
Date of PPPL Report: December 2001
Published in: Fusion Science and Technology 43 No 2 (March 2003) 145-152
The Princeton Plasma Physics Laboratory (PPPL) and the Massachusetts Institute of Technology (MIT) are preparing an experiment of current profile control using lower-hybrid waves in order to produce and sustain advanced tokamak regimes in steady-state conditions in Alcator C-Mod. Unlike couplers in JET, ToreSupra, and JT60, the C-Mod lower-hybrid coupler does not employ the now conventional multijunction design, but will have similar characteristics, compactness, and internal power division while retaining full control of the antenna element phasing. This is achieved by using 3 dB vertical power splitters and a stack of laminated plates with the waveguides milled in them. Construction is simplified and allows easy control and maintenance of all parts. Many precautions are taken to avoid arcing. Special care is also taken to avoid the recycling of reflected power which could affect the coupling and the launched n|| spectrum. The results from C-Mod should allow further simplification in the designs of the coupler planned for KSTAR and ITER.