Analysis of 4-strap ICRF Antenna Performance in Alcator C-Mod

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Description

A 4-strap ICRF antenna was designed and fabricated for plasma heating and current drive in the Alcator C-Mod tokamak. Initial upgrades were carried out in 2000 and 2001, which eliminated surface arcing between the metallic protection tiles and reduced plasma-wall interactions at the antenna front surface. A boron nitride septum was added at the antenna midplane to intersect electric fields resulting from radio-frequency sheath rectification, which eliminated antenna corner heating at high power levels. The current feeds to the radiating straps were reoriented from an E||B to E parallel B geometry, avoiding the empirically observed {approx}15 kV/cm field limit and ... continued below

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1.4 MB pages

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Schilling, G.; Wukitch, S.J.; Boivin, R.L.; Goetz, J.A.; Hosea, J.C.; Irby, J.H. et al. July 31, 2003.

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Description

A 4-strap ICRF antenna was designed and fabricated for plasma heating and current drive in the Alcator C-Mod tokamak. Initial upgrades were carried out in 2000 and 2001, which eliminated surface arcing between the metallic protection tiles and reduced plasma-wall interactions at the antenna front surface. A boron nitride septum was added at the antenna midplane to intersect electric fields resulting from radio-frequency sheath rectification, which eliminated antenna corner heating at high power levels. The current feeds to the radiating straps were reoriented from an E||B to E parallel B geometry, avoiding the empirically observed {approx}15 kV/cm field limit and raising antenna voltage holding capability. Further modifications were carried out in 2002 and 2003. These included changes to the antenna current strap, the boron nitride tile mounting geometry, and shielding the BN-metal interface from the plasma. The antenna heating efficiency, power, and voltage characteristics under these various configurations will be presented.

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1.4 MB pages

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INIS; OSTI as DE00814732

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  • Other Information: PBD: 31 Jul 2003

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  • Report No.: PPPL-3849
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/814732 | External Link
  • Office of Scientific & Technical Information Report Number: 814732
  • Archival Resource Key: ark:/67531/metadc738089

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 31, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 8:28 p.m.

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Schilling, G.; Wukitch, S.J.; Boivin, R.L.; Goetz, J.A.; Hosea, J.C.; Irby, J.H. et al. Analysis of 4-strap ICRF Antenna Performance in Alcator C-Mod, report, July 31, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc738089/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.