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Figure 5
(a) Position of the electron beam showing 50 µm steps. (b) Corresponding motion of the photon beam as measured by both wBPMs. (c) Movement of the photon beam from angular movements of the electron beam, demonstrating that the photon beam does not respond to small angular motions of the electron beam. (d) Position dependence of the photon beam versus the undulator gap separation.

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SYNCHROTRON
RADIATION
ISSN: 1600-5775
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