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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 5: Hadron Accelerators – New Devices and Techniques
AKBP 5.6: Vortrag
Dienstag, 29. März 2022, 15:15–15:30, AKBP-H13
Dispersive coupling in low-energy electron cooling at CRYRING@ESR — •Claude Krantz1, Zoran Andelkovic1, Christina Dimopoulou1, Frank Herfurth1, Regina Heß1, Michael Lestinsky1, Esther B. Menz1, Konstantin Mohr1,2, Wilfried Nörtershäuser2, Andreas Reiter1, Jon Roßbach1, Rodolfo Sánchez1, and Gleb Vorobjev1 — 1GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt — 2Institut für Kernphysik, TU Darmstadt, 64298 Darmstadt
The heavy-ion storage ring CRYRING has been recommissioned at GSI/FAIR. Downstream of the ESR, the ring can serve as a platform for precision experiments on highly-charged ions produced by the full GSI accelerator chain. In a complementary standalone mode, CRYRING can operate with weakly or singly charged ions provided by a local low-energy injector. Especially singly-charged ions are often limited to storage velocities of the order of 10−2 c, not to exceed the maximum rigidity allowed by the bending magnets. Electron cooling of so slow beams is challenged by dispersive coupling effects which lead to entanglement of the horizontal and longitudinal cooling rates. If dispersion in the cooler section is significant, over-optimisation of cooling for one degree of freedom can lead to cancellation or even reversal of the cooling force in the other dimension. At CRYRING@ESR, the effect was found during preparation of a singly-charged beam of Mg+ for an atomic-physics experiment, where unwanted heating of longitudinal ion motion by the electron cooler was observed. Dedicated machine studies on dispersive electron cooling at CRYRING are planned.