Investigation of ICRF coupling resistance in Alcator C-Mod Tokamak

Parisot, A.; Wukitch, S.J.; Ram, A.; Parker, R.; Lin, Y.; Hughes, J.W.; Labombard, B.; Bonoli, P.; Porkolab, M.
December 2003
AIP Conference Proceedings;2003, Vol. 694 Issue 1, p158
Conference Proceeding
The ICRF coupling resistance for Alcator C-Mod antennas has been studied for low H minority fractions discharges. We have observed a strong correlation between the coupling resistance and the electron radial density profile at the plasma edge, which is routinely monitored on C-Mod with millimeter resolution Thomson scattering. The fast wave cutoff is in the limiter shadow for typical operations, and the strongest influence is found with the density at the top of the edge pedestal. The coupling also increases in EDA H-mode with the neutral pressure at the wall, which is related to changes in the density in the scrape-off layer. This dependence on density profiles is found to be in agreement with a 1D wave propagation model developed by Ram and Bers in 1984. With better knowledge of the density profile in the scrape-off layer, this work can allow relevant comparison of antenna performance, especially between the two straps and four straps antennas in C-Mod. © 2003 American Institute of Physics


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