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Observation of fast stochastic ion heating by drift waves

McChesney, J. M. and Stern, R. A. and Bellan, P. M. (1987) Observation of fast stochastic ion heating by drift waves. Physical Review Letters, 59 (13). pp. 1436-1439. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:MCCprl87

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Abstract

With use of laser-induced fluorescence in the Caltech Encore tokamak, anomalously fast (40× classical) ion heating has been observed and found to correlate with the presence of large-amplitude drift-Alfvén waves. Using numerical simulations we demonstrate that the heating is stochastic and occurs when ion displacement due to polarization drift becomes comparable to the perpendicular wavelength, i.e., when k⊥^2φ̃/ωciB0≃1. Stochastic heating may also be the cause of the anomalously high ion temperatures observed in reverse-field pinches.


Item Type:Article
Additional Information:©1987 The American Physical Society. Received 23 April 1987. We thank Mr. F. Cosso for his assistance with electronics. One of us (R.A.S.) would like to thank the Sherman Fairchild Foundation for a fellowship. This work was supported by National Science Foundation Grant No. PHY-8312489.
Record Number:CaltechAUTHORS:MCCprl87
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:MCCprl87
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.59.1436
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9369
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:16 Dec 2007
Last Modified:26 Dec 2012 09:48

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