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Vertical Emittance Measurement with a Vertical Undulator

Vertical Emittance Measurement with a Vertical Undulator. Mark Boland Australian Synchrotron University of Melbourne On behalf of Kent Wootton University of Melbourne. Oxford, 10 July 2013 Low Emittance Ring Workshop. Abstract.

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Vertical Emittance Measurement with a Vertical Undulator

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  1. Vertical Emittance Measurement with a Vertical Undulator Mark Boland Australian Synchrotron University of Melbourne On behalf of • Kent Wootton • University of Melbourne Oxford,10 July 2013 Low Emittance Ring Workshop

  2. Abstract • Method developed to measure the vertical emittance in a storage ring using a vertical undulator. (K. P. Wootton, M. J. Boland, et al. (2012). "Observation of Picometer Vertical Emittance with a Vertical Undulator." Physical Review Letters 109(19): 194801.) • Measure the ratio of the odd and even harmonic peaks. • Observed ultra low vertical emittance on SLSA storage ring. • Characterised the undulator radiation and got good agreement with calculated radiation using measured magnetic field maps. • Improved sensitivity by scanning the e-beam and collect statistics • Planned improvements by measuring the photon polarisation. LER 2013, Oxford - Mark Boland

  3. Overview of the Method • APPLE II undulator on the Soft X-ray beamline at the Australian Synchrotron (B. C. Cowie, A. Tadich, and L. Thomsen, AIP Conf. Proc. 1234, 307 (2010).) • Phase the magnets to vertical polarisation LER 2013, Oxford - Mark Boland

  4. Spectral Measurement Results LER 2013, Oxford - Mark Boland

  5. Cross Check with X-ray Pinhole Camera LER 2013, Oxford - Mark Boland

  6. Sensitivity to Pinhole Size and Beam Decay LER 2013, Oxford - Mark Boland

  7. Undulator Characterisation • Blade scans to observe vertical distribution • Asymmetry observe between the top and bottom peak • Comparison with SPECTRA simulations of 2D radiation • SPECTRA tracks of e-beam through measured magnetic field also produce assymetry LER 2013, Oxford - Mark Boland

  8. New Approach • Time averaging • Normalise to beam current due to 1 hour lifetime at minimised emittance • Beam bumps instead of blade scans • Electron beam Orbit bumps through the undulator • Parallel position bump and vertical angle bumps Angle scan of the e-beam through the undulator for three different harmonics (red odd, blue even, black odd) LER 2013, Oxford - Mark Boland

  9. Measurement of Latest Emittance Minimisation • Not sensitive enough to sub pm emittance • Need to separate p and s modes in the photon beam • 2D x-ray pixel detector may also help resolve ultra low emttances LER 2013, Oxford - Mark Boland

  10. Polarisation Simulations • Improved sensitivity with selection of only vertical photon polarisation • Acknowledgement of Spring-8 Takano work S. Takano, EMIT’ 97, KEK Proceedings 97-20 (1997) LER 2013, Oxford - Mark Boland

  11. Conclusions/further work • Not sensitive enough for sub pm emittance • Planning polarisation measurements • Seeking interested collaborators (with 2D x-ray detectors?) LER 2013, Oxford - Mark Boland

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