Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Instrumentation IV

HK 18.2: Talk

Tuesday, March 17, 2026, 16:30–16:45, PHIL B 302

Measuring the nuclear spin polarization of a pulsed H⁻ ion source — •Simon Jakob Pütz^1,2,4, Tarek El-Kordy⁵, Ralf Engels², Nicolas Faatz^1,2,6, Ralf Gebel¹, Kirill Grigoryev¹, Chrysovalantis Kannis³, Yury Valdau¹, Jan Wirtz¹, and Yury Litvinov¹ — ¹GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt — ²Institut für Kernphysik, Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52428 Jülich — ³Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf — ⁴Institut für Kernphysik, Universität zu Köln, Zülpicherstraße 77, 50937 Köln — ⁵FH Aachen, University of Applied Sciences, Bayernallee 11, 52066 Aachen — ⁶RWTH Aachen, Otto-Blumenthal-Straße 19, 52074 Aachen

At the Forschungszentrum Jülich, the COSY accelerator was fed with polarized H⁻ / D⁻ ions for stripping injection into the ring. For polarized beamtimes, knowing the initial polarization directly behind the source is essential before conducting experiments. An automated and reliable data acquisition system was developed to improve the time and energy effieciency of the process. For this purpose, the applicability of the Lamb-shift polarimeter was expanded to include pulsed H⁻ and D⁻ ion beams. Unlike other methods, the LSP is capable of measuring the nuclear spin polarization of particle beams in the keV energy range. The presented study adresses the optimization of nuclear spin polarimetry for upcoming polarized sources of the COSY type without pre-acceleration.

Keywords: Polarization; pulsed ion sources; Nuclear spin; Lamb-shift Polarimetry