Ultracold Plasma Expansion in a Magnetic Field

Details Ultracold Plasma Expansion in a Magnetic Field Ultracold Plasma Expansion in a Magnetic Field

2008-04-05

arxiv.org/abs/0804.0827v1

Phys. Rev. Lett. 100, 235002 (2008)

Physics

Plasma Physics

4 pages, 5 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.100.235002

We measure the expansion of an ultracold plasma across the field lines of a uniform magnetic field. We image the ion distribution by extracting the ions with a high voltage pulse onto a position-sensitive detector. Early in the lifetime of the plasma ($< 20$ $\mu$s), the size of the image is dominated by the time-of-flight Coulomb explosion of the dense ion cloud. For later times, we measure the 2-D Gaussian width of the ion image, obtaining the transverse expansion velocity as a function of magnetic field (up to 70 G). We observe that the expansion velocity scales as B$^{-1/2}$, explained by a nonlinear ambipolar diffusion model with anisotropic diffusion in two different directions.

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