First ring for FAIR

Successful beam transport from ESR to CRYRING

3D CRYRING model. The ESR is behind the rear wall. (Picture: Wolfgang Geithner, GSI)

CRYRING end of 2015 (Photo: Michael Lestinsky, GSI)

The experimental collaboration SPARC (a part of APPA) and GSI teams successfully tested the beam transport from the existing GSI Experimental Storage Ring (ESR) to the first FAIR-storage ring CRYRING@ESR, which is being installed on the GSI premises. During the last beamtime block at GSI, the teams extracted C6+ ions from ESR at 6 MeV/u (corresponding to Bρ ≈ 0.7 Tm) in a microsecond bunch and transported the particles onto the first diagnostic station inside of CRYRING@ESR. The modified transport beam line from ESR to Cave B (where CRYRING is being set up) has been fully operational including the newly built magnetic septum in CRYRING. Furthermore, new beam diagnostics and FAIR-like control hardware and software could be tested with real beam.


CRYRING, formerly in Stockholm, is an immensely successful ion storage ring which has enabled central research contributions in atomic and molecular physics for many years. As Swedish in-kind contribution to FAIR, the ring was delivered to Darmstadt in 2013. Here, the ring has been modernized and adapted to FAIR standards and was placed downstream of ESR, as CRYRING@ESR project. It will allow testing of novel FAIR technologies and enable research on slow highly charged ion (HCI) beams and possibly exotic systems. SPARC along with other FAIR collaborations prepares many new experiments in the domain of atomic and nuclear processes, in material science and possibly even biomolecular physics with slow HCIs.


The successful beam transport from ESR to CRYRING also marks the beginning of its commissioning, byintegrating both rings into one facility. For the year to come all ring installations will be brought into operation, including a local ion source, the electron cooler and necessary ultra-high vacuum conditions. After 2018, CRYRING shall be ready to perform its first experiments with slow HCI beams, when the GSI accelerators will also recommence their operation.

More about CRYRING

Delivery of CRYRING to Darmstadt

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