Observation of an ultracold plasma instability

Details Observation of an ultracold plasma instability Observation of an ultracold plasma instability

2008-06-29

arxiv.org/abs/0806.4691v2

Phys. Rev. Lett. 101, 195002 (2008)

Physics

Plasma Physics

5 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.101.195002

We present the first observation of an instability in an expanding ultracold plasma. We observe periodic emission of electrons from an ultracold plasma in weak, crossed magnetic and electric fields, and a strongly perturbed electron density distribution in electron time-of-flight projection images. We identify this instability as a high-frequency electron drift instability due to the coupling between the electron drift wave and electron cyclotron harmonic, which has large wavenumbers corresponding to wavelengths close to the electron gyroradius.

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