Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster: Collisions, scattering and recombination

A 26.4: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Diagnostics of the electron cyclotron motion in an electron beam ion trap — •Chintan Shah1, Pedro Amaro1, René Steinbrügge2, Christian Beilmann1, 2, Sven Bernitt2, Stephan Fritzsche3, 4, Andrey Surzhykov3, José Ramón Crespo López-Urrutia2, and Stanislav Tashenov11Physikalisches Institut, Heidelberg, Germany — 2Max-Plank-Institut für Kernphysik, Heidelberg, Germany — 3Helmholtz-Institut Jena, Jena, Germany — 4Theoretisch-Physikalisches Institut, Jena, Germany

The electron cyclotron motion within an electron beam propagating through a strong magnetic field was studied at the electron beam ion trap FLASH-EBIT at the Max Planck Institute for Nuclear Physics in Heidelberg. It was probed by measuring the angular distribution of the x rays produced by resonant electron recombination in highly charged iron and krypton ions. For this purpose two germanium detectors registered x rays emitted along and perpendicularly to the beam propagation direction. A comparison of the measured x-ray emission asymmetries with those predicted using the Flexible Atomic Code revealed a small systematic discrepancy which we attribute to a non-vanishing component of the electron momentum transverse to the beam propagation direction. This cyclotron motion is enhanced as the beam propagates from the cathode into the much stronger magnetic field at the trap region. From the data we have deduced the cyclotron motion energy component at the trap center. This experiment demonstrates the suitability of resonant recombination angular distribution measurements for accurate diagnostics of plasma anisotropies.

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