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Title: A Third Generation Lower Hybrid Coupler

Abstract

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).

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
792992
Report Number(s):
PPPL-3638
TRN: US0200873
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 5 Dec 2001
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTENNAS; CONSTRUCTION; DESIGN; MAINTENANCE; PHYSICS; PLASMA; RECYCLING; STEADY-STATE CONDITIONS; WAVEGUIDES

Citation Formats

S. Bernabei, J. Hosea, C. Kung, D. Loesser, J. Rushinski, J.R. Wilson, and R. Parker. A Third Generation Lower Hybrid Coupler. United States: N. p., 2001. Web. doi:10.2172/792992.
S. Bernabei, J. Hosea, C. Kung, D. Loesser, J. Rushinski, J.R. Wilson, & R. Parker. A Third Generation Lower Hybrid Coupler. United States. doi:10.2172/792992.
S. Bernabei, J. Hosea, C. Kung, D. Loesser, J. Rushinski, J.R. Wilson, and R. Parker. Wed . "A Third Generation Lower Hybrid Coupler". United States. doi:10.2172/792992. https://www.osti.gov/servlets/purl/792992.
@article{osti_792992,
title = {A Third Generation Lower Hybrid Coupler},
author = {S. Bernabei and J. Hosea and C. Kung and D. Loesser and J. Rushinski and J.R. Wilson and R. Parker},
abstractNote = {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).},
doi = {10.2172/792992},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 05 00:00:00 EST 2001},
month = {Wed Dec 05 00:00:00 EST 2001}
}

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