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arXiv · 1606.06334

Polarization measurement of dielectronic recombination transitions in highly charged krypton ions

Chintan Shah·Holger Jörg·Sven Bernitt·Stepan Dobrodey·René Steinbrügge·Christian Beilmann·Pedro Amaro·Zhimin Hu·Sebastian Weber·Stephan Fritzsche·Andrey Surzhykov·José R. Crespo López-Urrutia·Stanislav Tashenov
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Abstract

We report linear polarization measurements of x rays emitted due to dielectronic recombination into highly charged krypton ions. The ions in the He-like through O-like charge states were populated in an electron beam ion trap with the electron beam energy adjusted to recombination resonances in order to produce $Kα$ x rays. The x rays were detected with a newly developed Compton polarimeter using a beryllium scattering target and 12 silicon x-ray detector diodes sampling the azimuthal distribution of the scattered x rays. The extracted degrees of linear polarization of several dielectronic recombination transitions agree with results of relativistic distorted--wave calculations. We also demonstrate a high sensitivity of the polarization to the Breit interaction, which is remarkable for a medium-$Z$ element like krypton. The experimental results can be used for polarization diagnostics of hot astrophysical and laboratory fusion plasmas.

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Chintan Shah, Holger Jörg, Sven Bernitt, Stepan Dobrodey, René Steinbrügge, Christian Beilmann, Pedro Amaro, Zhimin Hu, Sebastian Weber, Stephan Fritzsche, Andrey Surzhykov, José R. Crespo López-Urrutia, Stanislav Tashenov. 2016-08-16. Polarization measurement of dielectronic recombination transitions in highly charged krypton ions. https://doi.org/10.1103/physreva.92.042702

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