Direct Measurement of Enhanced Particle Slowing from 1D Long-Range Collisions*

We will discuss the first direct measurements of enhanced parallel velocity slowing (and diffusion) rates due to 1D long-range collisions in Mg$^{\mathrm{+}}$ ion plasmas. The un-neutralized magnetized ion plasmas are contained in near-thermal-equilibrium states in cylindrical Penning-Malmberg traps, with densities $n\sim 10^{7}\mbox{cm}^{-3}$ and temperatures $10^{-5}

*Supported by AFOSR FA9550-19-1-0099 and DOE DE-SC-0018236