Abstracts Brochure - CERN

THPLS — Poster Session 29-Jun-06 16:00 - 18:00
Fast Polarization Switching at the SLS Microspectroscopy Beamline POLLUX
POLLUX is a new microspectroscopy facility
which will be operated at a bending magnet M. Böge, U. Flechsig, J. Raabe, T. Schilcher (PSI)
at the Swiss Light Source (SLS). It offers spectroscopy
with sub-micron spatial resolution for polymer science and magnetism. First user operation is scheduled for
summer 2006. One of the novel envisaged options of the beamline is the usage of circular polarized light. The circular
polarization will be generated by a localized angular steering of the electron beam within the bending magnet. This
is accomplished by means of the SLS Fast Orbit Feedback system which allows to stabilize the electron beam to the
micrometer level up to frequencies of 100 Hz. Due to the adapting coupling compensation involving dedicated adjacent
skew quadrupoles, this steering becomes practically transparent for the other beamlines. Polarization switching
rates of a few Hz are within reach. The system design and first measurements are presented.
Installation and Test Results of the Achromatic Superconducting Wiggler in the Taiwan
Light Source
In order to increase more high flux x-ray
photon beams for the Taiwan Light Source,
the achromatic superconducting wiggler has
been installed and tested in a 1.5 GeV storage
C.-H. Chang, H.-P. Chang, H.-H. Chen, T.-C. Fan, M.-H. Huang,
C.-S. Hwang, F.-Y. Lin (NSRRC)
ring. The 3.1 Tesla superconducting wiggler will be operated in a 4.5 K liquid helium cryogenic system. In this work,
the operation experience and test results of the achromatic superconducting wiggler are described.
Research and Development of a Linear Polarization Superconducting Undulator at the
NSLS
To attain high brightness and wide tuning
range of hard x-ray radiation from a medium S. Chouhan, D.A. Harder, G. Rakowsky, J. Skaritka, T. Tanabe (BNL)
energy storage ring requires short period,
higher field undulators. A short version of a 15 mm period superconducting undulator prototype is under development
at the NSLS. The structures are being built with a new NbTi wire with artificial pinning centers, which
has been shown to attain higher critical current than is achievable with conventional NbTi. In this paper the winding
concept and plans for prototype testing are described.
Magnetic Design and Measurements of a Cryo-capable In-vacuum Undulator for NSLS
A new, 1m long, 18 mm period, NdFeB hybrid,
in-vacuum undulator has just been in- G. Rakowsky, D.A. Harder, J. Skaritka, T. Tanabe (BNL)
stalled in the NSLS X-ray Ring, replacing the
15-year old X25 Wiggler. The device has been designed and mechanically cold tested to 150K for future operation
as a cryo-permanent magnet undulator*. The magnet arrays, assembled at NSLS, use new, high-remanence, hightemperature
NdFeB magnets developed for hybrid car motors. The end termination design maximizes the number of
poles radiating in-phase. We made extensive use of an improved, quantitative pulsed wire method for trajectory and
multipole measurements and shimming. Lessons learned in magnet sorting for hybrid undulators will be discussed.
*T. Hara et al. Cryogenic permanent undulator, Phys.rev. ST AB volume 7 050702 (2004).
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