HI Jena

An experiment addressing electron capture (EC) decay of hydrogen-like ions has been conducted at the experimental storage ring (ESR) at GSI. The decay appears to be purely exponential and no modulations were observed. [...]

We have devised an experimental method and apparatus for the simultaneous nondestructive determination of the absolute ion number, ionkinetic energy, and length of bunches of charged particles. We have built and operated a corresponding electronic detector that is based oninduced charges and their subsequent low-noise amplification at cryogenic temperatures. [...]

Laguerre-Gaussian-like laser beams have been proposed for driving experiments with high-intensity lasers. They carry orbital angular momentum and exhibit a ring-shaped intensity distribution in the far field which make them particularly attractive for various applications. [...]

In this paper, we propose a study of the picosecond temporal contrast degradation of ultrashort laser pulses by surface defects in pulse stretchers. In a chirped-pulse-amplification stretcher or compressor, dust and damages on the surface of an optical element lead to a spectral amplitude modulation [...]