Quantitative investigation of linear arbitrary polarization in an APPLE-II undulator

Hand, M.; Wang, H.; Maccherozzi, F.; Apollonio, M.; Zhu, J.; Dhesi, S.S.; Sawhney, K.

doi:10.1107/S1600577518001960

Journal of Synchrotron Radiation Journal of
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Figure 5
(a) Measurements of the photon beam polarization were carried out for different horizontal $[\Delta{x_{\rm{e}}}]$ and vertical $[\Delta{y_{\rm{e}}}]$ offsets of the electron beam orbit through the downstream undulator while the gap and row phase were set to produce LA45° light. (b) Similarly to the case where offsets in the top row phase and gap were introduced, when the P₃ parameter is plotted against the offset coordinates $[\Delta{x_{\rm{e}}}]$ and $[\Delta{y_{\rm{e}}}]$ a plane is formed which intersects the plane representing P₃ = 0 and provides a set of configurations which minimize P₃.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 25| Part 2| March 2018| Pages 378-384

https://doi.org/10.1107/S1600577518001960

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