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Title: Comparison of planar helical undulator designs for spear beamline five

Abstract

There is an increasing demand for circularly polarized soft x-rays in the study of magnetic materials, biological molecules, and other systems that exhibit circular dichroism. At present, most experiments have been done with bending magnet radiation that is circularly polarized above and below the horizontal midplane of the storage ring. A number of insertion devices generate elliptically polarized x-rays, such as bifilar solenoids, elliptical and asymmetric wigglers, crossed undulators, and planar helical undulators. Elliptically polarized light is generated when electrons enter a helical magnetic field; the helicity of the field determines the helicity of the x-ray emission. Among the various technologies, the pure permanent magnet planar helical undulator is probably the best choice for installation on BLV in summer, 1993. This approach was pioneered by Pascal Elleaume at ESRF; he has installed a device of this type called `Helios`. Richard Walker and Shigemi Sasaki have developed alternative planar helical undulators, which improve on the basic design of Elleaume. This proposal is a discussion of planar helical undulator strategies from which implementation choices can be made. We will consider only pure RCP and LCP sources, since we are trying only to span the range from 500--1000 eV. If we needed amore » broader range, we might consider creating elliptically polarized light, and hence, harmonics which RCP and LCP sources do not have.« less

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10135814
Report Number(s):
SLAC-TN-93-2; SLAC/SSRL-0002
ON: DE93009082
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jan 1993
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; WIGGLER MAGNETS; COMPARATIVE EVALUATIONS; DESIGN; BEAM BENDING MAGNETS; MAGNETIC FIELDS; MONOCHROMATORS; X RADIATION; 430303; EXPERIMENTAL FACILITIES AND EQUIPMENT

Citation Formats

Carr, R. Comparison of planar helical undulator designs for spear beamline five. United States: N. p., 1993. Web. doi:10.2172/10135814.
Carr, R. Comparison of planar helical undulator designs for spear beamline five. United States. https://doi.org/10.2172/10135814
Carr, R. 1993. "Comparison of planar helical undulator designs for spear beamline five". United States. https://doi.org/10.2172/10135814. https://www.osti.gov/servlets/purl/10135814.
@article{osti_10135814,
title = {Comparison of planar helical undulator designs for spear beamline five},
author = {Carr, R},
abstractNote = {There is an increasing demand for circularly polarized soft x-rays in the study of magnetic materials, biological molecules, and other systems that exhibit circular dichroism. At present, most experiments have been done with bending magnet radiation that is circularly polarized above and below the horizontal midplane of the storage ring. A number of insertion devices generate elliptically polarized x-rays, such as bifilar solenoids, elliptical and asymmetric wigglers, crossed undulators, and planar helical undulators. Elliptically polarized light is generated when electrons enter a helical magnetic field; the helicity of the field determines the helicity of the x-ray emission. Among the various technologies, the pure permanent magnet planar helical undulator is probably the best choice for installation on BLV in summer, 1993. This approach was pioneered by Pascal Elleaume at ESRF; he has installed a device of this type called `Helios`. Richard Walker and Shigemi Sasaki have developed alternative planar helical undulators, which improve on the basic design of Elleaume. This proposal is a discussion of planar helical undulator strategies from which implementation choices can be made. We will consider only pure RCP and LCP sources, since we are trying only to span the range from 500--1000 eV. If we needed a broader range, we might consider creating elliptically polarized light, and hence, harmonics which RCP and LCP sources do not have.},
doi = {10.2172/10135814},
url = {https://www.osti.gov/biblio/10135814}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}