TY - JOUR
T1 - Polarization measurement of dielectronic recombination transitions in highly charged krypton ions
AU - Shah, Chintan
AU - Jörg, Holger
AU - Bernitt, Sven
AU - Dobrodey, Stepan
AU - Steinbrügge, René
AU - Beilmann, Christian
AU - Amaro, Pedro
AU - Hu, Zhimin
AU - Weber, Sebastian
AU - Fritzsche, Stephan
AU - Surzhykov, Andrey
AU - Crespo López-Urrutia, José R.
AU - Tashenov, Stanislav
N1 - This work was supported by the Deutsche Forschungsgemeinschaft (DFG) within the Emmy Noether program under Contract No. TA 740 1-1 and by the Bundesministeriums fur Bildung und Forschung (BMBF) under Contract No. 05K13VH2.
PY - 2015/10/7
Y1 - 2015/10/7
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84944342578&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.92.042702
DO - 10.1103/PhysRevA.92.042702
M3 - Article
AN - SCOPUS:84944342578
SN - 1050-2947
VL - 92
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 4
M1 - 042702
ER -