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Observations of Lower Hybrid Wave Absorption in the Scrape Off Layer of a Diverted Tokamak

Author(s)
Wallace, Gregory Marriner; Parker, Ronald R.; Bonoli, Paul T.; Harvey, R. W.; Schmidt, Andrea Elizabeth; Smirnov, A. P.; Whyte, Dennis G.; Wilson, J. R.; Wright, John C.; Wukitch, Stephen James; ... Show more Show less
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Abstract
The Lower Hybrid Current Drive (LHCD) system on Alcator C-Mod is designed to drive off-axis current in the core plasma, e.g. r/a<=0.8, however several interesting observations indicate that the LH waves are depositing significant power in the Scrape Off Layer (SOL) in high density L-Mode discharges. These phenomena are observed in accessible plasmas below the so-called “density limit” attributed to Parametric Decay Instabilities as omega-->2omegalh. Parallel current densities of ~500 kA/m [superscript 2] are measured on divertor Langmuir probes located just outside the separatrix during high power LH operation above n-bare~1×10[superscript 20] m[superscript −3]. These SOL currents rise at the same density at which the line integrated hard X-ray Bremsstrahlung emission drops sharply. Ray tracing/Fokker-Planck simulations over-estimate the line integrated X-ray emissivity by a factor of ~500 at n-bare = 1.4 10[superscript 20] m[superscript −3] as compared to a factor of 3–4 at n-bare = 0.6×10[superscript 20] m. Ray tracing simulations including a realistic SOL show similar trends in X-ray emission compared with the experimental observations. ©2009 American Institute of Physics
Date issued
2009-11
URI
http://hdl.handle.net/1721.1/67328
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
AIP Conference Proceedings
Publisher
American Institute of Physics
Citation
Wallace, G. M. et al. “Observations of Lower Hybrid Wave Absorption in the Scrape Off Layer of a Diverted Tokamak.” Gent (Belgium), 2009. 395-398. ©2009 American Institute of Physics
Version: Final published version
ISSN
0094-243X
1551-7616

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