Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.8: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

A Concept for a Spin-Polarized Electron Target in a Heavy Ion Storage Ring — •Michael Lestinsky and Thomas Stöhlker — GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt

We are presently designing a spin-polarized electron target. It builds upon a photocathode electron gun which is well established to serve as an efficient source of highly polarized electron beams. A mix of electrostatic and magnetic fields shall permit an arbitrary orientation of the incident electron polarization. Further, the interaction zone of the electrons with ions circulating in the storage ring will be featuring a flexible setup such that it allows for either transverse or longitudinal beam alignments. Here we lay out the planned design and report on its present status.

First experiments are foreseen to address a complete description of polarized electron induced emission of X-rays in inelastic collisions with heavy ions. These requires the knowledge of the full quantum state of all involved reactants, in particular determining the orientation of the polarization vector. We will employ Compton polarimetry of X-ray photons, which has become in our laboratory an established technique in such experiments. In the literature so far corresponding experiments were mostly carried out with unpolarized electron sources.