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in creator/contributor: "Baity, F. W."  
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Simulation of enhanced tokamak performance on DIII-D using fast wave current drive

Description: The fast magnetosonic wave is now recognized to be a leading candidate for noninductive for the tokamak reactor due to the ability of the wave to penetrate to the hot dense core region. Fast wave current drive (FWCD) experiments on D3D have realized up to 120 kA of rf current drive, with up to 40% of the plasma current driven noninductively. The success of these experiments at 60 MHZ with a 2 MW transmitter source capability has led to a major upgrade of the FWCD system. Two additional transmit… more
Date: May 1, 1993
Creator: deGrassie, J. S.; Lin-Liu, Y. R. Petty, C. C.; Pinsker, R. I.; Chan, V. S.; Prater, R.; St. John, H. (General Atomics, San Diego, CA (United States)) et al.
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Partner: UNT Libraries Government Documents Department
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Rf modeling and design of a folded waveguide launcher for the Alcator C-Mod tokamak

Description: The folded waveguide (FWG) launcher is being investigated as an improved antenna configuration for plasma heating in the ion cyclotron range of frequencies (ICRF). A development FWG launcher was successfully tested at Oak Ridge National Laboratory (ORNL) with a low-density plasma load and found to have significantly greater power density capability than current strap-type antennas operating in similar plasmas. To further test the concept on a high density tokamak plasma, a collaboration has bee… more
Date: December 1, 1993
Creator: Bigelow, T. S.; Fogelman, C. F.; Baity, F. W.; Carter, M. D.; Hoffman, D. J.; Ryan, P. M. et al.
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Partner: UNT Libraries Government Documents Department
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Design and control of phased ICRF antenna arrays

Description: Phased antenna arrays operating in the ion cyclotron range of frequencies (ICRF) are used to produce highly directional wave spectra, primarily for use in current drive experiments. RF current drive using phased antennas has been demonstrated in both the JET and DIII-D tokamaks, and both devices are planning to operate new four-element arrays beginning early next year. Features of antenna design that are relevant to phased operation and production of directional spectra are reviewed. Recent adv… more
Date: November 1, 1993
Creator: Goulding, R. H.; Baity, F. W. & Hoffman, D. J.
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Partner: UNT Libraries Government Documents Department
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Fast wave current drive technology development at ORNL

Description: The technology required for fast wave current drive (FWCD) systems is discussed. Experiments are underway on DIII-D, JET, and elsewhere. Antennas for FWCD draw heavily upon the experience gained in the design of ICRF heating systems with the additional requirement of launching a directional wave spectrum. Through collaborations with DIII-D, JET, and Tore Supra rapid progress is being made in the demonstration of the physics and technology of FWCD needed for TPX and ITER.
Date: December 1, 1993
Creator: Baity, F. W.; Batchelor, D. B.; Goulding, R. H.; Hoffman, D. J.; Jaeger, E. F.; Ryan, P. M. et al.
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Partner: UNT Libraries Government Documents Department
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Experimental test of a two-port decoupler in the DIII-D Fast Wave Current Drive system

Description: The DIII-D Fast Wave Current Drive (FWCD) system employs a pair of resonant loops of transmission line to reduce the four element phased antenna array to a two-port system. The equivalent two-port can be characterized by a 2 {times} 2 admittance matrix Y{sub ij}, the off-diagonal elements of which are non-zero due to the reactive coupling between the elements on the antenna array. By connecting another two-port network (a ``decoupler``) in parallel with the two feedlines, it is possible to redu… more
Date: November 1, 1993
Creator: Pinsker, R. I.; Petty, C. C.; Cary, W. P.; Baity, F. W. & Goulding, R. H.
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Partner: UNT Libraries Government Documents Department
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Fast wave at 433 MHz on FTU by a folded waveguide launcher

Description: The use of fast wave (FW) power to interact directly with electrons is a useful tool for central heating of high density, high temperature plasmas and for electron current drive (CD). Direct electron heating by FW has been observed on JET and TFTR and, although FW absorption is weak at low {beta}, successful electron heating and CD have been achieved on DIII-D at Te=2--3keV. The folded waveguide (FWG) is a promising new concept for ICRF launchers having the advantage of compact, rigid structure… more
Date: October 1, 1993
Creator: Barbato, E.; De Marco, F.; Jaeger, E. F.; Carter, M. D.; Hoffman, D. J.; Baity, F. W. et al.
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Partner: UNT Libraries Government Documents Department
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