Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Highly Charged Ions and their Applications

A 39.5: Vortrag

Freitag, 14. März 2025, 12:00–12:15, KlHS Mathe

Broadband laser cooling of stored bunched relativistic carbon ions using a high repitition rate pulsed laser system — Sebastian Klammes¹, Lars Bozyk¹, Michael Bussmann^2,3, Noah Eizenhöfer⁴, Volker Hannen⁵, Max Horst⁴, Daniel Kiefer⁴, Thomas Kühl^1,6, Benedikt Langfeld^4,7, Xinwen Ma⁸, Wilfried Nörtershäuser^4,7, Rodolfo Sánchez¹, Ulrich Schramm^3,9, Mathias Siebold², Peter Spiller¹, Markus Steck¹, Thomas Stöhlker^1,6,10, Ken Ueberholz⁵, Thomas Walther^4,7, Hanbing Wang⁸, Weiqiang Wen⁸, and •Danyal Winters¹ — ¹GSI Darmstadt — ²HZDR Dresden — ³Casus Görlitz — ⁴TU Darmstadt — ⁵Uni Münster — ⁶HI Jena — ⁷HFHF Darmstadt — ⁸IMP Lanzhou — ⁹TU Dresden — ¹⁰Uni-Jena

Laser cooling of relativistic bunched ion beams at storage rings has proven to be a powerful technique to obtain very small relative longitudinal momentum spreads (Δp/p ∼1E-6 range). This contribution will give an overview of the principle, which is based on resonant absorption (photon momentum & energy) in the longitudinal direction and subsequent spontaneous random emission (fluorescence & ion recoil) by the ions, combined with a moderate bunching of the ion beam. We will report on the curent status and results from the latest laser cooling beamtime at the ESR, where broadband laser cooling of bunched relativistic C³⁺ ion beams was successfully demonstrated for the first time using a sophisticated pulsed UV laser system with a very high repetition rate (∼9 MHz), variable pulse durations (166-734 ps), and high UV power (>250 mW).

Keywords: laser cooling; pulsed laser system; ion; accelerator