RF Technology Development

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RF Technology Development

• D.A. Rasmussen, D.W. Swain,F.W. Baity, T.S.
  Bigelow, M.D. Carter, J.B.O. Caughman, A.
  Fadnek, R.L. Goulding, P.M. Ryan and D.O.
  SparksOak Ridge National Laboratory
• VLT Meeting
• Washington DC
• August 25, 2005

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Key RD Thrusts over next 5 years for RF
Technology - develop reliable, advanced ion
cyclotron heating and current drive systems

• Reliable operation at the design power, voltage
  and pulse length.
• Reduced port size - high power density launchers.
• Robust - load tolerant for varying plasma and
  edge conditions (ELMs, blobs, uv radiation).
• Flexible
• Operate over a wide range of density and magnetic
  fields.
• Heat either ions or electrons
• Control plasma conditions via heating and current
  profile.
• Compatible with a reactor environment.

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Descriptions of RD thrusts

• Reliability RF breakdown studies (ORNL UIUC),
  rf/edge modeling diagnostics (NSTX) and lower
  voltage antenna designs (DIII-D).
• High power density Modeling circuit and coupling
  physics, prototype testing and operation of
  antennas for JET-EP, ITER and Tore Supra.
• Load tolerance Novel internal and external load
  tolerant tuning elements and passive active
  control with 3dB couplers arc/ELM
  discrimination. (JET, DIII-D, ITER)
• Flexibility Broadband phased arrays for JET-EP
  and ITER. ICRF, LH and EBW launchers for high
  beta alternates (NSTX, MST, TJ-II, NCSX, QPS).
• Reactor compatibility ITER Long Pulse design,
  Faraday Shield and Tuning Element Development
  (ITA 51-01,02,07). Ceramic Testing For Use in
  ITER Environment (ITA 51-08).

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Current Spending on RD Thrusts

• Reliability 400 K
• High power density 330 K
• Load tolerance 300 K
• Flexibility 320 K
• Reactor compatibility 250 K
• Collaborations allow effective deployment of new
  technology and benchmarking of design and
  analysis tools.
• Experimental and diagnostic support from NSTX,
  DIII-D, MST, and international collaborations
• Predictive code, modeling and analysis support
  from theory

High Power Prototype of load tolerant antenna for
JET
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Spending on RD Thrusts FY06

• Reliability 400 K
• High power density 330 K
• Load tolerance 300 K
• Flexibility 320 K
• Reactor compatibility 250 K
• Experimental and diagnostic support from NSTX,
  DIII-D, MST, and international collaborations
• Predictive codes, modeling and analysis support
  from theory
• Irradiation and PFC RD from materials program
• ITER specific RD

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Characterization of RD thrusts to VLT missions