Multiple-reflection [formula omitted] phase shifter: A viable alternative to generate circular-polarized synchrotron radiation

Abstract

We propose the use of a multiple-reflection polarizer as a highly effective tool to generate circular-polarized synchrotron radiation by utilizing the phase difference in the s- and p-components of multiple-reflected light. In the energy range hν = 8–100 eV, a quadruple reflector can be optimized either in the degree of circular polarization P circ or in the modified throughput TP circ 2. A linear undulator/quadruple reflector polarizer system is much more effective than the crossed-field undulator concept. In addition to the high throughput, a multiple reflector used as a post-polarizer for monochromatized light provides an easy way to control and modulate the state of polarization P circ. The proposed concept of converting linearly polarized monochromatic light into circular light does not encounter the potential dephasing problems intrinsic to the other alternatives. Extensive model calculations to optimize the figure of merit TP circ 2 are presented, and a mechanical design of a prototype quadruple polarizer presently under construction at SRC is discussed in detail.