Improved Cooling Methods for Magnetized Electron Plasmas

Cavity and lumped-element resonators have been designed for coupling electron plasmas to a 4 K thermal bath via their cyclotron modes and Trivelpiece-Gould modes. Plasmas cooled this way can reach lower temperatures and can be manipulated at lower magnetic fields than those cooled via free-space cyclotron radiation. We are exploring gradient enhanced cyclotron-cavity resonance, resistive cooling, and phase-space tailoring schemes with the goal of optimizing cooling of $N > 10^5$ electrons from $\sim 1 \, \mathrm{eV}$ to $\sim 10 \, \mathrm{K}$ temperatures in a few seconds.