McChesney, J. M. and Bellan, P. M. and Stern, R. A. (1991) Observation of fast stochastic ion heating by drift waves. Physics of Fluids B, 3 (12). pp. 3363-3378. ISSN 0899-8221. http://resolver.caltech.edu/CaltechAUTHORS:MCCpofb91
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Anomalously fast ion heating has been observed in the Caltech Encore tokamak [Phys. Rev. Lett. 59, 1436 (1987)], with the use of laser-induced fluorescence. This heating was found to be independent of electron temperature, but was well correlated with the presence of large-amplitude drift-Alfvén waves. Evidence is presented that suggests that the heating is stochastic and occurs when the ion displacement due to polarization drift becomes comparable to the perpendicular wavelength, i.e., when k[perpendicular] (mik[perpendicular] phi0/qB^2)~1. Stochastic heating may also be the cause of the anomalously high ion temperatures observed in reversed-field pinches.
|Additional Information:||Copyright © 1991 American Institute of Physics. Received 30 March 1990; accepted 16 August 1991. This work was taken from the doctoral dissertation of one of the authors (J.M.McC.). One of us (R.A.S.) would like to thank the Sherman Fairchild Foundation for a fellowship. The authors would like to thank Frank Cosso for his assistance with the electronics. This work was supported by National Science Foundation Grant No. PHY-8312489.|
|Subject Keywords:||TOKAMAK DEVICES, PLASMA HEATING, FLUORESCENCE, ALFVEN WAVES, REVERSE−, FIELD PINCH, ELECTRON TEMPERATURE, ION TEMPERATURE, POLARIZATION, GUIDING−, CENTER APPROXIMATION, DRIFT WAVES, ANOMALOUS PROPERTIES, STOCHASTIC HEATING, CHAOTIC SYSTEMS|
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|Deposited On:||18 Dec 2007|
|Last Modified:||26 Dec 2012 09:48|
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