TITLE

Electromagnetic instabilities and gyrophase-bunched particles

AUTHOR(S)
Gary, S. Peter; Thomsen, Michelle F.; Fuselier, Stephen A.
PUB. DATE
February 1986
SOURCE
Physics of Fluids (00319171);Feb86, Vol. 29 Issue 2, p531
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The linear theory of electromagnetic instabilities at propagation parallel or antiparallel to a uniform magnetic field B(0) is used to calculate the relative phase angle ψj between the fluctuating velocity vector of the jth component and the fluctuating magnetic field. A criterion that determines when this phase relationship leads to observable gyrophase bunching during the linear growth phase of an instability is also derived. The theory is applied to bunching of ion components by ion beam instabilities. Among the electromagnetic cool ion beam instabilities, it is found that the right-hand resonant mode is most likely to cause observable gyrophase bunching of an ion beam during linear growth, and that for sufficiently large beam–core relative drift speeds, ψb [bar_over_tilde:_approx._equal_to]90° at maximum growth for instability propagation parallel to B(0).
ACCESSION #
9827774

 

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