Underdense Plasma Lens Commissioning at FACET-II

Here we report on the early commissioning efforts for the laser-ionized underdense plasma lens experiment at FACET-II. The setup includes a fs Ti:Saph laser pulse that passes through a focusing optic, with the focus located in the outflow of a gas jet and in the electron beamline. The initial design leverages the ionization profile at the focus of a simple spherical lens, where the lens is on a motorized stage that allows the focus to be shifted horizontally with respect to the electron beamline. This allows for the thickness of the plasma lens to be varied and give more control to the focusing force. Additionally, early experiments in the near future using the plasma lens will be discussed.