Effect of N[subscript 2], Ne and Ar seeding on Alcator C-Mod H-mode confinement
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psi_2010_paper_v4-hutchinson 1.pdf
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Author(s)
Reinke, Matthew Logan
Hughes, John F.
Loarte, A.
Brunner, Daniel Frederic
Labombard, Brian
Payne, Joshua E.
Hutchinson, Ian Horner
Terry, James L
Alternative Title
Effect of N2, Ne and Ar seeding on Alcator C-Mod H-mode confinement
Date Issued
January 2011
Journal
Journal of Nuclear Materials
Publisher
Elsevier
Citation
Reinke, M.L., J.W. Hughes, A. Loarte, D. Brunner, I.H. Hutchinson, B. LaBombard, J. Payne, and J.L. Terry. “Effect of N2, Ne and Ar Seeding on Alcator C-Mod H-Mode Confinement.” Journal of Nuclear Materials 415, no. 1 (August 2011): S340–S344.
Version
Author's final manuscript
Abstract
The mitigation of divertor heat fluxes is an active topic of investigation on existing tokamaks. One approach uses radiation, both inside and outside the last closed flux surface (LCFS), to convert plasma thermal energy, usually directed towards dedicated plasma facing components, to soft X-ray and ultraviolet radiation, spread over a much larger surface area. Recent enhanced D-α H-mode experiments on Alcator C-Mod varied the ICRF input power and radiative power losses via impurity seeding to demonstrate that normalized energy confinement depends strongly on the difference between input power and the radiated power inside the LCFS. These investigations also show that when seeded with either Ne or N2, a factor of two and higher reduction in outer divertor heat flux is achieved while maintaining H[subscript 98,y2] ∼ 1.0. Conversely, when seeding with Ar, confinement is limited to H[subscript 98,y2] ∼ 0.8 for a similar level of exhaust power.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Plasma Science and Fusion Center
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.jnucmat.2010.10.055
