Thumbnail
Access Restriction
Open

Author Kortright, J. ♦ Rice, M. ♦ Hussain, Z. ♦ Padmore, H. ♦ Adamson, A. ♦ Huff, W. ♦ Young, A. ♦ Moler, E. ♦ Kellar, S. ♦ Ynzunza, R. ♦ Palomares, F. ♦ Daimon, H. ♦ Tober, E. ♦ Fadley, C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS ♦ ADVANCED LIGHT SOURCE ♦ POLARIMETRY ♦ PHOTON BEAMS ♦ POLARIZATION ♦ SYNCHROTRON RADIATION ♦ APERTURES ♦ RADIATION FLUX ♦ X RADIATION ♦ EV RANGE 100-1000
Abstract Using multilayer linear polarizers, we have characterized the polarization state of radiation from bend-magnet beamline 9.3.2 at the Advanced Light Source as a function of vertical opening angle at photon energies of 367 and 722 eV. Both a fine slit and a coarse semi-aperture were stepped across the beam to accept different portions 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 the close agreement of the theoretical and experimental results for linear polarization. The results are in good agreement with theoretical calculations, with departures from theory resulting from uncertainty in the 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 maximum figure of merit, given by the square root of flux times the degree of circular polarization, when the aperture edge is on the orbit plane thus blocking only half of the total available flux. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Department Lawrence Berkeley National Laboratory
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 67
Issue Number 9
Technical Publication No. CONF-9510119-
Organization Lawrence Berkeley National Laboratory


Open content in new tab

   Open content in new tab