SPARC Topical Workshop 2016

High-precision X-ray spectroscopy of highly-charged heavy ions is one of the established subjects within the program of SPARC. To improve the precision of such experiments, the detector concept of silicon microcalorimeters, which detect the temperature change of an absorber induced by an incoming photon, is now exploited. Silicon microcalorimeters were successfully applied in several...

High precision x-ray spectroscopy of heavy highly charged ions provides an excellent tool for a test of the most advanced theories describing the atomic structure in the regime of extreme field strengths. These theories take into account quantum electrodynamic (QED) corrections of higher orders and the structure of the atomic nucleus. In this contribution, we present the experiment where the...

The energy distribution of electrons emitted in heavy-ion atom collision is a characteristic observable for understanding the underlying charge-transfer processes. Previously, we studied the collision system U88+ + N2 at a projectile energy of 90 MeV/u at the ESR using the magnet forward-angle electron spectrometer [1-3]. For electrons released from the projectile ions in collisions with...

In July 2016, test experiments with stored 12C3+ beams (122 MeV/u) could be conducted at the ESR in Darmstadt, Germany. The same type of ion beam was used in August 2012 for a laser cooling experiment, but then a small admixture (12%) of 16O4+ was present. This time, we had pure carbon ion beams and also with a much higher (~10x) intensity. Inside the vacuum of the ESR, an XUV detector system,...

Recent modification of the internal target source setup at the experimental storage ring (ESR) led to a significant improvement of its performance. In particular, a reliable operation of the light target gases helium and hydrogen at unprecedented area densities up to values of 10E14 1/cm² was demonstrated [1]. In the course of these optimization efforts, a remarkably versatile target source...