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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 22
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Phys. Rev. Lett. 102, 225006 (2009) [4 pages]

Beam-Plasma Instabilities in a 2D Yukawa Lattice

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S. Kyrkos1, G. J. Kalman2, and M. Rosenberg3
1Department of Chemistry & Physics, Le Moyne College, Syracuse, New York 13214, USA
2Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
3Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093, USA

Received 14 December 2008; published 5 June 2009

We consider a 2D Yukawa lattice of grains, with a beam of other charged grains moving in the lattice plane. In contrast to Vlasov plasmas, where the electrostatic instability excited by the beam is only longitudinal, here both longitudinal and transverse instabilities of the lattice phonons can develop. We determine and compare the transverse and longitudinal growth rates. The growth rate spectrum in wave number space exhibits remarkable gaps where no instability can develop. Depending on the system parameters, the transverse instability can be selectively excited.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.225006
DOI:
10.1103/PhysRevLett.102.225006
PACS:
52.27.Lw, 52.27.Gr, 52.35.Qz
 
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