Have we seen first optical pumping in a storage ring?

This question is investigated in our paper published today in Physical Review Accelerators and Beams.
We study optical pumping in the ESR using a rate equation approach to explain the disappearance of an optical resonance in Li+ when changing for linear to circular polarized light. We come to the conclusion that this disappearance cannot be explained without assuming that the created polarization must at least partially survive a revolution in the storage ring. This is a strong motivation for further investigations at CRYRING@ESR, where we hope to observe similar effects with Mg+ ions and to study them in detail.
The paper is open access and can be accessed here.

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