Circular polarization measurements at the BESSY crossed field undulator

Johannes Bahrdt; Andreas Gaupp; William B. Peatman; Franz Schaefers; Ch. Wang

doi:10.1117/12.168577

15 February 1994 Circular polarization measurements at the BESSY crossed field undulator

Johannes Bahrdt, Andreas Gaupp, William B. Peatman, Franz Schaefers, Ch. Wang

Proceedings Volume 2010, X-Ray and Ultraviolet Polarimetry; (1994) https://doi.org/10.1117/12.168577
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

The crossed field undulator independently proposed by Moiseev et al. and K. J. Kim generates short wavelength (photon energy above 35 eV) circularly polarized radiation. It is based on the coherent superposition of two mutually orthogonally polarized wavetrains generated in two `ordinary' undulators arranged one after the other along with electron beam axis. The superposition is achieved in a monochromator of sufficient spectral resolution. The relative phase is determined by the so called modulator located in between the two undulators. It is a three pole magnetic structure returning the electrons to the axis with a time delay with respect to the straight path of the order of an optical period.

Citation Download Citation

Johannes Bahrdt, Andreas Gaupp, William B. Peatman, Franz Schaefers, and Ch. Wang "Circular polarization measurements at the BESSY crossed field undulator", Proc. SPIE 2010, X-Ray and Ultraviolet Polarimetry, (15 February 1994); https://doi.org/10.1117/12.168577

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