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ECH and Fast Wave Electron Heating Systems for NCSX

ECH and Fast Wave Electron Heating Systems for NCSX. Tim Bigelow, Dave Rasmussen, Phil Ryan, Mike Cole ORNL Joel Hosea, Elmer Fredd PPPL. 28 GHz ECH has multiple applications on NCSX. Utilize existing standalone gyrotron @28 GHz 40 kW for 500 ms.

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ECH and Fast Wave Electron Heating Systems for NCSX

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  1. ECH and Fast Wave Electron Heating Systems for NCSX Tim Bigelow, Dave Rasmussen, Phil Ryan, Mike Cole ORNL Joel Hosea, Elmer Fredd PPPL

  2. 28 GHz ECH has multiple applications on NCSX • Utilize existing standalone gyrotron @28 GHz • 40 kW for 500 ms. • Socket can be upgraded to 200 kW with HV supply • Replace 25 kA ohmic First Plasma scenario with currentless ECH • Eliminates iota profile control complications from ohmic currents • ECH could be used to selectively heat passing or trapped populations for confinement studies. • Low power CW ECH at low B field may be a useful for vessel conditioning

  3. Standalone - Gyrotron, HV power supply socket, magnet, water manifold Footprint is 4’x6’ Controls, magnet, waveguide all compatible with 200 kW cw power upgrade at 28 GHz using existing PPPL supplies

  4. Inside vacuum Waveguide and launcher configuration Block Diagram - Proposed NCSX 28 GHz ECH System

  5. A modified version of the ATF ECH launcher could be used on NCSX ATF ECH launcher

  6. ICRF fast wave heating on NCSX with a 57 MHz FWG antenna • 2-4 MW of tunable ICRF transmitters located adjacent to NCSX test cell (can be retuned in ~ 1 month) • Utilize direct electron heating mode at 57 MHz, 0.5 -1.2 T • IBW mode may also be feasible • Tilt antenna to match edge field line pitch • 40 kW 28 GHz startup could provide adequate target plasma • Loading modeling for startup and other target plasmas can be done by M. Carter

  7. 57 MHZ FOLDED WAVEGUIDE Monopole Dipole • Monopole or dipole face plates provide options on wave launch spectrum • Rear coaxial feed and coupling loop • Vacuum tank to enclose antenna allows arbitrary antenna rotation angle

  8. FWG can be mounted on a NB port • 57 MHz folded WG will fit on NCSX NB port • Coils and cryostat do not appear to interfere • Folded WG can be rotated in port for field line optimization and IBW experiments

  9. Approximately to Scale drawing of FWG on NCSX NB port Existing FWG Vacuum tank FWG body Coaxial RF feed line Vacuum Interface Flange and in-vessel Support structure

  10. PPPL ICRF transmitters can be utilized to drive the FWG • Two FMIT units • 40-80 MHz • ~ 2 MW each; can be combined • Can be tuned to 57 MHz in < 1 month • Transmission line to NCSX exists to wall • Tuner, RF instrumentation installed and operational

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