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A single photon counting system has been developed for efficient detection offorward emitted fluorescence photons at the Experimental Storage Ring (ESR) atGSI. The system employs a movable parabolic mirror with a central slit that canbe positioned around the ion beam and a selected low noise photomultiplier fordetection of the collected photons. Compared to the previously used system ofmirror segments installed inside the ESR the collection efficiency forforward-emitted photons is improved by more than a factor of 5. No adverseeffects on the stored ion beam have been observed during operation besides asmall drop in the ion current of about 5% during movement of the mirror intothe beam position. The new detection system has been used in the LIBELLEexperiment at ESR and enabled for the first time the detection of theground-state hyperfine M1 transition in lithium-like bismuth (209Bi80+) in alaser-spectroscopy measurement.

Detection system for forward emitted photons at the Experimental Storage Ring at GSI