Actions for ICRF stabilization of sawteeth on TFTR [electronic resource].

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ICRF stabilization of sawteeth on TFTR [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
37 pages : digital, PDF file
Additional Creators
Princeton University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Results obtained from experiments utilizing high power ICRF (ion cyclotron range of frequency) heating to stabilize sawtooth oscillations on TFTR are reviewed. The key observations include existence of a minimum ICRF power required to achieve stabilization, a dependence of the stabilization threshold on the relative size of the ICRF power deposition profile to the q=1 volume, and a peaking of the equilibrium pressure and current profiles during sawtooth-free phases of the discharges. In addition, preliminary measurements of the poloidal magnetic field profile indicate that q on axis decreases to a value of 0.55±0.15 after a sawtooth-stabilized period of ∼0.5 sec has transpired. The results are discussed in the context of theory, which suggests that the fast ions produced by the ICRF heating suppress sawteeth by stabilizing the m=1 MHD instabilities believed to be the trigger for the sawtooth oscillations. Though qualitative agreement is found between the observations and the theory, further refinement of the theory coupled with more accurate measurements of experimental profiles will be required in order to complete quantitative comparisons.
Report Numbers
E 1.99:pppl--2820
pppl--2820
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1992.
"pppl--2820"
"DE92006648"
White, R.; Terry, J.; Wilson, J.R.; Park, H.; Phillips, C.K.; Taylor, G.; Bell, M.; Hoffman, D.; Stevens, J.; Schilling, G.; Hill, K.; Hughes, M.; Phillips, M.W.; Houlberg, W.; Cheng, C.Z.; McCune, D.; Hosea, J.; Bitter, M.; Stratton, B.; Bush, C.; Darrow, D.; Fredrickson, E.; Zweben, S.; Jassby, D.; Synakowski, E.; Boivin, R.; Marmar, E.; Hammett, G.W.; Owens, D.K.; Ramsey, A.; Goldfinger, R.; McGuire, K.; Schivell, J.; Snipes, J.; Towner, H.; Hsuan, H.; Smithe, D.N.; Nagayama, Y.
Type of Report and Period Covered Note
Topical; 01/01/1992 - 01/01/1992
Funding Information
AC02-76CH03073
View MARC record | catkey: 14746105