A Third Generation Lower Hybrid Coupler

Bernabei, S. ; Hosea, J. ; Kung, C. ; Loesser, D. ; Rushinski, J. ; Wilson, J.R. ; Parker, R.

Princeton University. Plasma Physics Laboratory.

关键词: Steady-State Conditions;    Waveguides;    70 Plasma Physics And Fusion Technology;    Recycling;    Maintenance;   

DOI  :  10.2172/792992
RP-ID  :  PPPL-3638
RP-ID  :  AC02-76CH03073
RP-ID  :  792992

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来源: UNT Digital Library

【 摘 要 】

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 JET's, ToreSupra's and JT60's couplers, 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(subscript ||) spectrum. The results from C-Mod should allow further simplification in the designs of the coupler planned for KSTAR (Korea Superconducting Tokamak Advanced Research) and ITER (International Thermonuclear Experimental Reactor).