Annual Meeting of the ErUM-FSP APPA 2026

Laser cooling, unlike established cooling methods such as electron cooling, promises to efficiently produce narrow longitudinal momentum distributions in relativistic bunched ion beams, even at large gamma factors. The concept was demonstrated (e.g. at the GSI in Darmstadt) using cw and pulsed laser systems separately, while the laser cooling facility in the upcoming heavy-ion synchrotron...

We report on the first laser excitation of the ground-state hyperfine transition in lithium-like
208-Bi80+. The experiment was performed at the ESR, in May 2025. Detection of the transition
was enabled through a new measurement scheme that combines laser excitation with dielectronic
recombination (DR). In this approach, the electron cooler is set to a voltage that leads to the DR
process...

M. Looshorn$^{*1,2}$, C. Brandau$^3$, M. Fogle$^4$, J. Glorius$^3$, E.-O. Hanu$^{3,5,6}$, V. Hannen$^7$,
P.-M. Hillenbrand$^3$, C. Krantz$^3$, M. Lestinsky$^3$, E.-B. Menz$^{3,8}$, R. Schuch$^9$, U. Spillmann$^3$,
K. Ueberholz$^7$, S.-X. Wang$^{1,2}$ and S. Schippers$^{1,2}$

$^1$I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Giessen, 35392, Germany
$^2$Helmholtz...

Dielectronic recombination (DR) is widely recognized as the dominant electron–ion recombination mechanism in many astrophysical and laboratory plasmas, where it plays a crucial role in determining ionization balances and level populations over a broad temperature range. Moreover, DR experiments of highly charged ions (HCIs) at the storage rings have been developed as a precision spectroscopic...

The vacuum-ultraviolet to extreme-ultraviolet (VUV–EUV) variable-line-spacing (VLS) grating
spectrometer being installed at the gas-jet target of CRYRING is a new set-up for photon spectroscopy of
ion-atom collisions. The setup enables detection of fluorescence (roughly 4–40 eV) from collision induced
excitation, charge exchange, and multiple ionization of atoms and molecules by highly...