Sprecher
Beschreibung
Electron-ion collision experiments in a
merged beams geometry (electron cooler) are
well established at ion storage rings. A complete
new range of experiments is possible if the geometry is changed to a crossed-beams setup in 90° angle between the electron and ion beams employing a dedicated free-electron target. The target
bridges the gap between low-collision-energy experiments in electron coolers and those employing quasi-free electrons of gas-jet targets. Compared to the latter, the absence of a target nucleus enables unambiguous studies of processes,
which are otherwise masked by competing reactions with the target nucleus. As compared to an
electron cooler, the interaction region of a transverse target is spatially well localized. This facilitates X-ray and electron spectroscopy with relatively large solid angles. Over the last years,
a specially tailored electron-target for heavy-ion
storage rings was developed and built at the
University of Giessen in cooperation with GSI.
Its scientific prospects have been outlined in the
CRYRING@ESR Physics Book [1]. The project benefits from decades-long experience of single-pass electron-ion-collision experiments [2–4].
