Extending the Range of AC Conductivity Measurements in Magnetized Ultracold Neutral Plasmas

Ultracold neutral plasmas can be used to study basic plasma processes such as electron-ion collisions and AC conductivity under extreme conditions. We have extended our measurement of the influence of magnetization on electron-ion collisions to magnetic fields where the electron Larmor radius is the smallest length scale in the plasma and electron-electron thermalization times are limiting our ability to explore higher magnetic fields with our current technique. Our measurements are compared with theoretical predictions.