Direct Observation of Ion Mode Instability on PBFA II
For the first time, the growth of a long-wavelength electromagnetic instability, the ion mode instability, is clearly
evident in Faraday cup data from experiments on the PBFA II accelerator at Sandia National Laboratories. The
phase velocity of the instability waves and the dependence of the growth of the instability on ion current
enhancement are consistent with the oscillations seen in simulated Faraday cup results from the
three-dimensional QUICKSILVER code. The instability is in the opposite phase on the top and bottom halves of
the radially-focusing diode. A full-geometry QUICKSILVER simulation of the diode is being done to understand
the effect of the phase difference of the waves on diode behavior.
Other Reports on High Energy Density and Inertial Confinement Fusion
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