January 1, 2014.
The Stanford Synchrotron Radiation Light accelerates electrons around a 234-meter circumference ring at relativistic speeds. The x-ray radiation produced by this process is used in many fields of science ranging from materials science to medicine.
This project seeks to measure the polarization of the 532 nanometer wavelength component in the visible light beam emitted from the SPEAR-3 synchrotron as a function of vertical position. The beam was focused through a lens, then passed through a 532 nm band pass filter and a polarizer mounted on a rotating stand. The beam power was measured as a function of vertical position and polarizer orientation such that the horizontal, vertical, 45 and 135 degree polarizations were measured. A quarter wave plate was inserted before the polarizer to measure the intensity of the left and right hand circular polarizations. This data was then analyzed to calculate the Stokes' Parameters and beam polarization ellipse. Future experiments could include the characterization of other wavelengths of light until the beam is fully characterized, or using polarized xrays to investigate chirality.
Atomic, Molecular and Optical Physics | Optics | Plasma and Beam Physics
SLAC National Accelerator Laboratory (SLAC)
This material is based upon work supported by the S.D. Bechtel, Jr. Foundation and by the National Science Foundation under Grant No. 0952013. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the S.D. Bechtel, Jr. Foundation or the National Science Foundation. This project has also been made possible with support of the National Marine Sanctuary Foundation. The STAR program is administered by the Cal Poly Center for Excellence in Science and Mathematics Education (CESaME) on behalf of the California State University (CSU).