Polarization measurement and vertical aperture optimization for obtaining circularly polarized bend-magnet radiation

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Using multilayer linear polarizers, we have studied the polarization state of radiation from bend magnet beamline 9.3.2 at Advanced Light Source as function of vertical oping angle at photon energies 367 and 722 eV. Both a fine slit and a coarse semi-aperture were stepped across the beam to accept different parts of the vertical radiation fan. Polarimetry yields the degree of linear polarization directly and the degree of circular polarization indirectly assuming an immeasurably small amount of unpolarized radiation based on close agreement of theory and experiment for linear polarization. Results are in good agreement with theoretical calculations, with departures ... continued below

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12 p.

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Kortright, J.B.; Rice, M. & Hussain, Z. October 1, 1995.

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  • Kortright, J.B.
  • Rice, M. Lawrence Berkeley National Lab, CA (United States). Center for X-ray Optics
  • Hussain, Z. Lawrence Berkeley National Lab., CA (United States). Advanced Light Source

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Description

Using multilayer linear polarizers, we have studied the polarization state of radiation from bend magnet beamline 9.3.2 at Advanced Light Source as function of vertical oping angle at photon energies 367 and 722 eV. Both a fine slit and a coarse semi-aperture were stepped across the beam to accept different parts of the vertical radiation fan. Polarimetry yields the degree of linear polarization directly and the degree of circular polarization indirectly assuming an immeasurably small amount of unpolarized radiation based on close agreement of theory and experiment for linear polarization. Results are in good agreement with theoretical calculations, with departures from theory owing to uncertainty in effective aperture of the measured beam. The narrow 0.037 mrad aperture on the orbit plane transmits a beam whose degree of linear polarization exceeds 0.99 at these energies. The wide semi-aperture blocking the beam from above and below transmits a beam with a max figure of merit, given by the square root of flux times degree of circular polarization, when the aperture edge is on the orbit plane thus blocking only half of the total available flux.

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12 p.

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INIS; OSTI as DE96008563

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  • SRI `95: synchrotron radiation instrumentation symposium and the 7. users meeting for the advanced photon source (APS), Argonne, IL (United States), 16-20 Oct 1995

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  • Other: DE96008563
  • Report No.: LBL--38212
  • Report No.: LSBL--299;CONF-9510119--33
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 213876
  • Archival Resource Key: ark:/67531/metadc670085

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Office of Scientific & Technical Information Technical Reports

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  • October 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 5, 2016, 10:26 a.m.

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Kortright, J.B.; Rice, M. & Hussain, Z. Polarization measurement and vertical aperture optimization for obtaining circularly polarized bend-magnet radiation, article, October 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc670085/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.