Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 52: Nuclear Clocks

Q 52.5: Vortrag

Donnerstag, 13. März 2025, 12:15–12:30, HS Botanik

Construction and Commissioning of a Closed-Cycle Xenon-Recycling System for HHG-based VUV Lasers — •Georg Holthoff, Tim Teuner, and Peter G. Thirolf — Ludwig-Maximilians-Universität, München, Deutschland

We discuss the need for and design, construction and commissioning of a closed-cycle Helium:Xenon-recovery system designed to scavenge, filter and recompress variable mixtures of Helium and Xenon (up to 9:1) to pressures of up to 100 bar for use in High-Harmonic Generation (HHG) based Vacuum Ultraviolet (VUV) laser-light generation. The relevant components of the system, i.e. first collection from the HHG enhancement-resonator chamber where the gas is used and its filtering at ambient pressure, second, compression to the planned operating range of 60 bar in two stages and third final filtering and pressure stabilization, as well as the control system, are discussed. Subsequently, the commissioning results are presented. They include operational tests of components, leak testing using different methods and gases (aiming for a total recovery efficiency of about 98%), as well as mass-spectrometric analysis of residual gasses at different stages of the system. Characterization results are acquired in a closed-loop test setup, using a borosilicate gas-injection nozzle of dimensions similar to those in the designated VUV frequency-comb laser. Instead of the HHG enhancement resonator of this laser, the injection chamber of the test loop is comprised of an additional small vacuum chamber to not endanger the laser components during commissioning of the gas-recycling system. Supported by the European Research Council (ERC): Grant 856415.

Keywords: HHG; Xenon-Recycling; VUV-Generation; Thorium-229; Nuclear Clock