Abstracts Brochure - CERN

THPLS — Poster Session 29-Jun-06 16:00 - 18:00
Electrical Shimming of Superconductive Undulators
The spectral quality of the synchrotron radiation
produced with an undulator depends
mainly on the quality of the magnetic field,
which is quantified by the phase error. In
April 2005 a superconductive undulator, the
so-called SCU14, was installed at the synchrotron
radiation facility ANKA. Measure-
D. Wollmann, T. Baumbach, A. Bernhard (University of Karlsruhe)
S. Casalbuoni, MH. Hagelstein, B.K. Kostka, R. Rossmanith (FZK)
G. Gerlach (University of Dresden, Institute for Solid-State Electronics)
E. Steffens, M. Weisser (University of Erlangen-Nürnberg,
Physikalisches Institut II)
ments of the magnetic field show significant deviations from an ideal undulator field. In this paper the calculated
phase error for the SCU14 is presented, and a model of the installed 100 period undulator with mechanical deviations
and their influence on the phase error is shown. A concept for phase error correction via electrical shimming for a
long superconductive undulator is presented.
Construction and Testing of a Focusing Undulator for ALPHA-X
ALPHA-X is a four-year project shared between
several research groups in the UK to B.J.A. Shepherd, J.A. Clarke (CCLRC/DL/ASTeC)
build a laser-plasma accelerator and produce
coherent short-wavelength radiation in an FEL. A pair of undulators for the project have been designed and built
by ASTeC at Daresbury Laboratory. The undulators are 1.5m long, 100 period permanent magnet devices with a
minimum gap of 3.5mm, a peak field of 0.7T and a two-plane focusing design. The devices were modelled using
RADIA, and data from the magnet block manufacturer was used to sort the blocks. To optimise the trajectory in
the real devices, magnetic testing (using Hall probe and flipping coil techniques) and block swapping has been
performed in Daresbury’s dedicated insertion device test facility. The measurements agree well with the models, and
the undulators will perform well within specification.
Planning for a 2nd Insertion Device in CAMD
To allow the possible installation of a 2nd Insertion
Device in the CAMD Light Source the
lattice optic needs to be changed. The present
configuration has a small vertical beta func-
V.P. Suller (CCLRC/DL/ASTeC) M.G. Fedurin, P. Jines, D.J.
Launey, T.A. Miller, Y. Wang (LSU/CAMD)
tion in the long straight containing the 7T wiggler. The new optic will give small vertical beta at two long straights
which are diametrically opposite. Test results with the new optic are presented together with the measured beam
parameters. These are used to predict the photon beam performance for several types of Insertion Device which could
be installed.
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THPLS125
THPLS126
THPLS127