S.N. Golovato

Publications (3)1.17 Total impact

• Conference Proceeding: RF modeling and design of a folded waveguide launcher for the Alcator C-Mod tokamak

  T.S. Bigelow, C.F. Fogelman, F.W. Baity, M.D. Carter, D.J. Hoffman, P.M. Ryan, J.J. Yugo, S.N. Golovato, P. Bonoli
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  ABSTRACT: 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 been set up between ORNL and Massachusetts Institute of Technology (MIT) to develop and test an 80-MHz, 2-MW FWG on the Alcator C-Mod tokamak at MIT. The radiofrequency (RF) electromagnetic modeling techniques and laboratory measurements used in the design of this antenna are described in this paper, A companion paper describes the mechanical design of the FWG
  Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on; 11/1993
• Conference Proceeding: Antennas for ICRF heating in the Alcator C-Mod tokamak

  S.N. Golovato, W. Beck, P. Bonoli, M. Fridberg, M. Porkolab, Y. Takase
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  ABSTRACT: The Alcator C-Mod tokamak experiment relies on ICRF heating as the sole source of auxilliary power. Two different antenna designs have been produced and fabricated for the ICRF heating experiments. The first antenna has a single current strap, a two-layer Faraday shield, and is movable radially. One of these antennas was built, conditioned to high RF voltage on a test stand, and installed on C-Mod for the first experimental run. The engineering goals of the first experiments include measuring the plasma loading and testing the power handling capability of the antenna. Details of the conditioning and tuning procedures will be presented. The second antenna has two phasable current straps and a single layer Faraday shield. The predicted high disruption forces require that it be attached securely to the vacuum vessel wall at a fixed radial position. Two of these antennas have been constructed, one having a titanium carbide coated Faraday shield and the other a boron carbide coated shield. They are designed to couple up to 4 MW of source power from two FMIT transmitters. Details of the fabrication and test stand conditioning of these antennas will be presented
  Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on; 11/1993
• Article: A Helical Launching Structure for Alfvén Wave Heating in the Proto-Cleo Stellarator

  S. N. Golovato, J. L. Shohet, J. A. Tataronis
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  ABSTRACT: A helical wave launching structure is analyzed to determine the spectrum of Alfvén waves that it can excite. Using an ideal MHD plasma model, the effectiveness of this helical coil for producing Alfvén wave heating in the Proto-Cleo stellarator is investigated. It is found that significant energy absorption should occur. The amount of absorption and the frequency range over which it is greatest are dependent on the shape of the radial profiles of the confining magnetic field and the plasma density.
  IEEE Transactions on Plasma Science 07/1977; · 1.17 Impact Factor