Bailey, A.D., III and Stern, R. A. and Bellan, P. M. (1993) Measurement of coherent drift-wave ion-fluid velocity field when ion dynamics are stochastic. Physical Review Letters, 71 (19). pp. 3123-3126. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:BAIprl93
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In order to test the validity of the fluid drift approximation when ion dynamics are stochastic, the time-dependent ion-fluid velocity field in a coherent, drift-Alfvén wave has been measured in Caltech’s Encore tokamak using plasma planar laser induced fluorescence. Many measured parameters of the wave are well described by the drift approximation above a threshold for stochastic ion dynamics, including the flow pattern in the single measured component of the ion-fluid velocity field. Surprisingly, the theory fails at a fundamental level by predicting flow speeds 10 times larger than those measured (‖umax‖≊10^5 cm/s).
|Additional Information:||©1993 The American Physical Society. Received 4 February 1993. We wish to thank Frank Cosso for assistance with electronics. This work was supported bu NSF Grant No. PHY-9114146.|
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|Deposited On:||14 Dec 2007|
|Last Modified:||26 Dec 2012 09:47|
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