Conference Presentation (Other)

FZJ-2025-04046

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Polarimetry of pulsed H$^−$/D$^−$ ion beams: Extended applicability of the Lamb-shift polarimeter

Pütz, S. J. (Corresponding author)FZJ* ; Engels, R. W.FZJ* ; Faatz, N.FZJ* ; Kannis, C.FZJ* ; Gebel, R.FZJ* ; Grigoryev, K.FZJ* ; Valdau, Y. ; El-Kordy, T.FZJ*

2025

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Please use a persistent id in citations: doi:10.34734/FZJ-2025-04046

Abstract: Until 2023, a polarized H$^−$/D$^−$ ion source delivered pulsed negative ion beams for stripping injection into the COSY accelerator. Accurate and efficient measurement of the nuclear spin polarization directly behind the source is essential for precision experiments at COSY. A data acquisition system was developed to enable reliable, automated measurements with improved efficiency and to reduce operator intervention. To achieve that, the applicability of the Lamb-shift polarimeter has been successfully expanded to include pulsed H$^−$ and D$^−$ ion beams. The presented setup is useful and suitable to determine and optimize the polarization of upcoming polarized sources of the COSY type without pre-acceleration. We also present additional measurements of the nuclear spin polarization of H$^+_3$ ion beams with a Lamb-shift polarimeter.

Keyword(s): Nuclei and Particles (1st) ; Nuclear Physics (2nd)

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
2. DFG project G:(GEPRIS)533904660 - Eine vielseitige Polarisationsmethode für Teilchen mit einfachen Hyperfeinstrukturen (533904660) (533904660)

Appears in the scientific report 2025

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