@inproceedings{a6a21fb6ac564500bc4ab0c81e485f65,
title = "Lower hybrid current drive in a high density diverted tokamak",
abstract = "Experimental observations of LHCD at high density ({\=n} e> 10 20m -3) on the Alcator C-Mod tokamak are presented in this paper. Bremsstrahlung emission from relativistic fast electrons in the core plasma drops sharply in single null discharges well below the density limit previously observed on limited tokamaks (ω/ω LH∼2). Modeling and experimental evidence suggest that the absence of LH driven fast electrons at high density may be due to collisional absorption in the scrape off layer. Experiments show that the expected current drive density dependence is recovered for inner wall limited discharges across the range of densities scanned (0.5×10 20m -3e<1. 5×10 20m -3). Increasing T e in the periphery of the plasma (0.8e. Ray tracing/Fokker-Planck simulations of these discharges predict the observed sensitivity to plasma position when the effects of collisional absorption in the SOL are included in the model.",
keywords = "Lower hybrid current drive, collisional absorption, density limit, ray tracing, scrape off layer",
author = "Wallace, \{G. M.\} and Hubbard, \{A. E.\} and S. Shiraiwa and Bonoli, \{P. T.\} and Faust, \{I. C.\} and Harvey, \{R. W.\} and Hughes, \{J. W.\} and Labombard, \{B. L.\} and C. Lau and O. Meneghini and Parker, \{R. R.\} and Reinke, \{M. L.\} and Schmidt, \{A. E.\} and Smirnov, \{A. P.\} and Terry, \{J. L.\} and Whyte, \{D. G.\} and Wilson, \{J. R.\} and Wright, \{J. C.\} and Wukitch, \{S. J.\}",
year = "2011",
doi = "10.1063/1.3665005",
language = "English",
isbn = "9780735409781",
series = "AIP Conference Proceedings",
pages = "419--422",
booktitle = "Radio Frequency Power in Plasmas - Proceedings of the 19th Topical Conference",
note = "19th Topical Conference on Radio Frequency Power in Plasmas ; Conference date: 01-06-2011 Through 03-07-2011",
}