Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Instrumentation IV
HK 18.7: Talk
Tuesday, March 17, 2026, 17:45–18:00, PHIL B 302
Development and Commissioning of an RFQ Cooler- Buncher for Laser Spectroscopy — •Finn Köhler1, Julian Palmes1, Bernhard Maaß2, Kristian König1, and Wilfried Nörtershäuser1 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Physics division, Argonne National Laboratory, USA
At rare-isotope beam facilities, radio-frequency-based beam cooler-bunchers (RFQCB) are particularly used to prepare ion beams for high-precision experiments at low energies (< 50 keV). They can accumulate rare beams for up to several seconds, cool them through collisions with a buffer gas, and emit ion bunches with a short time and energy width. This contribution will report on the development of a new, compact RFQCB that produces ion bunches well suited for laser spectroscopy measurements at the Collinear Apparatus for Laser Spectroscopy and Applied Physics (COALA) in Darmstadt. A two level differential pumping scheme allows for a high-pressure region at the entrance of the RFQCB to efficiently capture incoming ions despite its short length. A laser ablation ion source is included at the injection side of the device to give access to a wide variety of ion species. We will report on the first commissioning results at COALA. As a next step, the device will serve as an injector, paving the way for laser-spectroscopy studies of ion bunches separated and extracted directly from a multi-reflection time-of-flight (MR-ToF) mass spectrometer. This project was supported by DFG (Project-ID 279384907 - SFB 1245) and BMFTR (05P24RD8).
Keywords: Ion bunch; Laser spectroscopy; Ion source; Emittance; MR-ToF