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Measurement of coherent drift-wave ion-fluid velocity field when ion dynamics are stochastic

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. doi:10.1103/PhysRevLett.71.3123.

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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).

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Bellan, P. M.0000-0002-0886-8782
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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Issue or Number:19
Record Number:CaltechAUTHORS:BAIprl93
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ID Code:9349
Deposited By: Archive Administrator
Deposited On:14 Dec 2007
Last Modified:08 Nov 2021 20:58

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