S604
GSI, Darmstadt, Germany
TU Darmstadt, Darmstadt, Germany
Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany
HZDR, Dresden, Germany
CASUS, Görlitz, Germany
IMP/CAS, Lanzhou, People’s Republic of China
Universität Kassel, Kassel, Germany
HFHF, Frankfurt am Main, Germany
HIJ, Jena, Germany
IOQ, Jena, Germany
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
We present our new (but still preliminary) results from a recent test beamtime for laser cooling of carbon ions (12C3+ @ 122 MeV/u) at the ESR. In May 2021, GSI kindly offered us the possibility to test the new pulsed UV laser system from the TU Darmstadt, which has a very high repetition rate (10 MHz), a variable pulse duration (70 - 740 ps) and more power (up to 250 mW). We have demonstrated laser cooling using this laser and present results for different laser pulse durations (166 - 740 ps). In addition, we could test the improved moveable in-vacuo fluorescence detection system from Münster University. Finally, we could also demonstrate our new ion bunch - laser pulse timing scheme and observe clear delay effects.
P1003
GSI, Darmstadt, Germany
Justus-Liebig-University Giessen, I. Physics Institute, Atomic and Molecular Physics, Giessen, Germany
Westfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, Germany
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
The cooler storage ring CRYRING has been recommissioned at GSI as a Swedish in-kind contribution to FAIR. Within the CRYRING@ESR project, it complements the heavy-ion facilities of GSI by a dedicated low-energy machine. Large parts of the CRYRING@ESR experimental programme rely on electron cooling as a means of beam preparation. Additionally, the cooler serves itself as low-energy internal electron target in atomic physics experiments. Upon installation of the cooler at GSI/FAIR, a number of technical upgrades have been made to improve operational performance and flexibility as an experimental platform. These include custom-made precision voltage dividers for monitoring the acceleration potential on the < 10 ppm level, as well as an experiment control system allowing rapid modulation of the electron energy. In recent GSI beamtimes, the electron cooler has been used successfully for cooling of highly-charged and singly-charged heavy-ion beams. Further hardware upgrades and dedicated experiments to characterise machine performance are planned.
