Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.15: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1

Ion source development for PIPE — •Alexander Perry-Saßmannshausen, Ticia Buhr, and Stefan Schippers — Justus-Liebig-Universität Gießen

We report on the development of a new ion source for measurements with the Photon-Ion-Spectrometer (PIPE) at beam line P04 of PETRA III at DESY in Hamburg. The new source is a Middleton type versatile negative ion source (VNIS) [1]. It produces intense negative ion currents by sputtering of caesium ions on a target material. Negative ions are prominent in low temperature plasmas like the upper atmosphere oder the interstellar medium. The main difference to positive ions is the way the additional electron is bound to the atom. Instead of by the coulomb force the electron is bound by polarization of the atomic core. Another interesting topic within respect is the study of inner shell ionization processes [2]. The design of the source was originally developed at Max-Planck-Institut für Kernphysik (MPI-K) at Heidelberg [3]. The new source was built in Gießen where also the tests will be performed at an ion source testbench. We will present mass spectra of ions produced in the source and show the behaviour of the source under various conditions.

[1] R. Middleton, A Negative-Ion Cookbook, 1990

[2] S. Schippers et al., Phys. Rev. A 94 (2016) 041401(R)

[3] J. Meier, Diploma thesis, University of Heidelberg, 2007