LINEAR POLARIZATION MEASUREMENTS OF THE SYNCHROTRON RADIATION FROM A BENDING MAGNET

We have measured the linear polarization of the ionizing radiation on the Stainless Steel Seya beam line 021 at the Synchrotron Radiation Center by measuring the displacement current from a gold surface after this radiation had reflected at a 45o incident angle from another gold surface. A characteristic cos2(θ) pattern was observed upon rotating these surfaces about the ionizing radiation propagation direction. After normalizing to the displacement current for the 45o reflection surface and accounting for the reflection coefficients of gold surfaces [1,2], we can place a minimum value for the linear polarization of ≥ 97%, independent of the ionizing photon energy from 24 eV down to zero order on the beam line monochromator grating. We would like to thank the staff and administration of the Synchrotron Radiation Center for the opportunity and assistance in accomplishing this project. The kind assistance of Mar