Upgrades to the 4-strap ICRF Antenna in Alcator C-Mod

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Description

A 4-strap ICRF antenna suitable for plasma heating and current drive has been designed and fabricated for the Alcator C-Mod tokamak. Initial operation in plasma was limited by high metallic impurity injection resulting from front surface arcing between protection tiles and from current straps to Faraday shields. Antenna modifications were made in February 2000, resulting in impurity reduction, but low-heating efficiency was observed when the antenna was operated in its 4-strap rather than a 2-strap configuration. Further modifications were made in July 2000, with the installation of BN plasma-facing tiles and radio- frequency bypassing of the antenna backplane edges and ... continued below

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155 Kilobytes pages

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Schilling, G.; Hosea, J.C.; Wilson, J.R.; Beck, W.; Boivin, R.L.; Bonoli, P.T. et al. June 12, 2001.

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Description

A 4-strap ICRF antenna suitable for plasma heating and current drive has been designed and fabricated for the Alcator C-Mod tokamak. Initial operation in plasma was limited by high metallic impurity injection resulting from front surface arcing between protection tiles and from current straps to Faraday shields. Antenna modifications were made in February 2000, resulting in impurity reduction, but low-heating efficiency was observed when the antenna was operated in its 4-strap rather than a 2-strap configuration. Further modifications were made in July 2000, with the installation of BN plasma-facing tiles and radio- frequency bypassing of the antenna backplane edges and ends to reduce potential leakage coupling to plasma surface modes. Good heating efficiency was now observed in both heating configurations, but coupled power was limited to 2.5 MW in H-mode, 3 MW in L-mode, by plasma-wall interactions. Additional modifications were started in February 2001 and will be completed by this meeting. All the above upgrades and their effect on antenna performance will be presented.

Physical Description

155 Kilobytes pages

Notes

INIS; OSTI as DE00786538

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  • Other Information: PBD: 12 Jun 2001

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  • Report No.: PPPL-3575
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/786538 | External Link
  • Office of Scientific & Technical Information Report Number: 786538
  • Archival Resource Key: ark:/67531/metadc716142

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • June 12, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 10:07 p.m.

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Schilling, G.; Hosea, J.C.; Wilson, J.R.; Beck, W.; Boivin, R.L.; Bonoli, P.T. et al. Upgrades to the 4-strap ICRF Antenna in Alcator C-Mod, report, June 12, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc716142/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.