Journal Article/Contribution to a conference proceedings

FZJ-2026-03143

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

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

2026

Abstract: Until 2023, a polarized H− /D− ion source delivered pulsed negative ion beams for stripping injectioninto the accelerator COSY at Forschungszentrum Jülich. Accurate and efficient measurementof the nuclear spin polarization directly behind the source is essential for precision experimentsat COSY. A data acquisition system was developed to enable reliable, automated measurementswith improved efficiency and to reduce operator intervention. To achieve that, the applicabilityof the Lamb-shift polarimeter has been successfully expanded to include pulsed H− and D− ionbeams. The presented setup is useful and suitable to determine and optimize the polarization ofupcoming polarized sources of the COSY type without pre-acceleration.

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

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)
2. Kernphysikalische Großgeräte (IKP-4)
3. Institute of Technology and Engineering (ITE)

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 2026

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