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

Journal of Synchrotron Radiation
Matthew HandK J S Sawhney

Abstract

Insertion devices are utilized at synchrotron radiation facilities around the world for their capability to provide a high-brilliance X-ray beam. APPLE-II type undulators are especially important for their capacity to switch between a variety of photon beam polarization states. A high-precision soft X-ray polarimeter has been used to investigate the polarization calibration of an APPLE-II undulator (period length λu = 64 mm) installed on beamline I06 at Diamond Light Source. Systematic measurement of the beam polarization state at a range of linear arbitrary angles has been compared with the expected result for a given set of undulator gap and row phase parameters calculated from theory. Determination of the corresponding Stokes-Poincaré parameters from the measured data reveals a discrepancy between the two. The limited number of energy/polarization combinations included in the undulator calibration tables necessitates the use of interpolated values for the missing points which is expected to contribute to the discrepancy. However, by modifying the orbit of the electron beam through the undulator by at least 160 µm it has been found that for certain linear polarizations the discrepancies can be corrected. Overall, it is sugges...Continue Reading

References

Jul 2, 2002·Journal of Synchrotron Radiation·A T YoungD G Castner
Jul 21, 2004·Journal of Synchrotron Radiation·O ChubarJ Chavanne
Oct 25, 2012·Journal of Synchrotron Radiation·Hongchang WangZhanshan Wang
Dec 25, 2015·Journal of Synchrotron Radiation·Matthew HandKawal Sawhney

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Python
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Generic Data Acquisition ( GDA )
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