26–31 Oct 2025
Wang Center
America/New_York timezone

Challenges of Laser Cooling at SIS100: UV Systems and Overlap in 5D

TUC3
28 Oct 2025, 14:30
30m
Wang Center

Wang Center

Stony Brook University campus, Stony Brook, New York
Contributed Oral Presentation COOL'25 Laser Cooling Session

Speaker

Denise Schwarz (Technical University of Darmstadt)

Description

Relativistic ion beams with a narrow momentum distribution are crucial for high-precision experiments at accelerator facilities. Laser cooling offers a promising approach to further reduce the momentum spread, thereby enhancing the ion beam quality. Previous experiments conducted at the Experimental Storage Ring (ESR) at GSI have demonstrated the efficiency of both continuous-wave (cw) and pulsed UV lasers in achieving this goal. By using three laser systems, the cooling efficiency can be further improved.

This work presents a continuous-wave laser system operating at a wavelength of $257.24\,\mathrm{nm}$, enabled by two second-harmonic generation stages. Particularly, long-term operation with high UV output power is of great interest. By employing elliptical focusing in the second enhancement cavity, a long term stable UV output power up to $2\,\mathrm{W}$ is achieved, providing an efficient solution for ion beam cooling. The integration of this cw laser and two pulsed laser systems at the SIS100 of FAIR requires the optimization of the spatial, temporal, and energy overlap between the three laser beams and the ion beam.

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Author

Denise Schwarz (Technical University of Darmstadt)

Co-authors

Dr Jens Gumm (Technical University of Darmstadt) Dr Benedikt Langfeld (Technical University of Darmstadt) Ms Tamina Grunwitz (Technical University of Darmstadt) Dr Sebastian Klammes (GSI Helmholtz Centre for Heavy Ion Research) Danyal Winters (GSI Helmholtz Centre for Heavy Ion Research) Prof. Thomas Walther (Technical University of Darmstadt)

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