Using Charged Particle Imaging to Study Ultracold Plasma Expansion

Details Using Charged Particle Imaging to Study Ultracold Plasma Expansion Using Charged Particle Imaging to Study Ultracold Plasma Expansion

2008-06-09

arxiv.org/abs/0806.1511v2

Physics

Plasma Physics

6 pages, 5 figures, submitted to AIP conference proceedings for the Non-Neutral Plasma Workshop (New York, 2008)

Scientific paper

10.1063/1.3122273

We develop a projection imaging technique to study ultracold plasma dynamics. We image the charged particle spatial distributions by extraction with a high-voltage pulse onto a position-sensitive detector. Measuring the 2D width of the ion image at later times (the ion image size in the first 20 $\mu$s is dominated by the Coulomb explosion of the dense ion cloud), we extract the plasma expansion velocity. These velocities at different initial electron temperatures match earlier results obtained by measuring the plasma oscillation frequency. The electron image size slowly decreases during the plasma lifetime because of the strong Coulomb force of the ion cloud on the electrons, electron loss and Coulomb explosion effects.

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