Electron cooling is a central beam preparation technique at CRYRING@ESR, and has been employed in all beamtimes since re-commissioning of the storage ring at GSI/FAIR in 2020. With the large variety of ion species available from the UNILAC/SIS18/ESR injector chain and from the local ion source, the electron cooler is required to operate at a wide range of beam parameters. Over the years, beam...
Metallic-magnetic microcalorimeter detectors for X-ray precision spectroscopy provide excellent energy
resolution combined with a broad bandwidth acceptance. This opens up new experimental possibilities, in
particular for bound-state QED studies in highly charged ions. Using a pair of such detector systems, we
recently conducted a landmark experiment, as presented in [P. Pfäfflein et al....
Metallic magnetic calorimeters (MMCs) of the maXs-series, developed within the SPARC collaboration, offer exceptional energy resolving power (up to E/ΔE ≈ 6000 at 60 keV) [1] over a broad spectral range (1–100 keV) with high quantum efficiency and linearity [2], making them ideal for high-precision X-ray spectroscopy in fundamental atomic physics. Their operation, however, requires intricate...
