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field is formed by 28 dipole magnets at nominal magnetic
field of 0.32 T. The undulator can work in standard mode
as well as in a quasi-periodical mode while the modulation
coils on the vertical field dipoles have been switched on.
Auxiliary correction coils on the end dipoles make it
possible to “zero” the first and second magnetic field
integrals to avoid perturbation of electron trajectories in the
Storage Ring. The model “undulator” configurations were
investigated by means of 3D magnetic computations, and
dependences of the magnetic field integrals from the main
macroscopic parameters have been obtained. The
magnetic measurements of the single dipoles were carried
by the Hall probes. The undulator was magnetically
measured by the Hall probes system and the Stretched
Wire System, described in the paper. The results of
magnetic measurements and computations are compared
and analyzed.
TUA07PO06
Mini-pole Superconducting Undulator for X-ray
Synchrotron Light Source
C-S. Hwang, J-C. Jan, P-H. Lin, C-H. Chang, M-H. Huang,
F-Y. Lin, T-C. Fan, H-H. Chen, National Synchrotron
Radiation Research Center.
A mini-pole vertical winding racetrack coil undulator was
studied for potential use as the hard X-ray source in a 3
GeV storage ring. A field strength of 1.5 T can be obtained
for the superconducting undulator with a periodic length of
1.5 cm and a magnet gap fixed at 5 mm. The spectra of
such a magnet cover the energies between 3 and 25 keV.
The coil is NbTi superconducting wire whose diameter,
including that of the insulator, is 0.44 mm. A spectrum
shimming method has been developed to correct the
magnetic field. A prototype superconducting undulator with
40 poles has been designed and will be constructed and
cooled in a bath of liquid helium. The prototype will be
tested and field measurements made in a vertical dewar.
This article will discuss the design of the magnet circuit and
the magnet structure, the field shimming method, the
measurement of the magnetic field, and critical issues
related to the construction process.
TUA07PO07
Optimisation calculations for the KATRIN Magnet
system
R. Gehring, FZ Karlsruhe; A. Osipowicz, FH Fulda; C.
Weinheimer, University Münster.
The Karlsruhe Tritium Neutrino experiment aims to
measure the the neutrino mass to extreme high precision
by measuring the energy spectrum of the electrons of the
tritium decay. A highly specialised magnet system is
needed to transport the electrons from tritium beta decay
along a more than 70 meter long path with differential and
cryogenic pumping sections, pre- and main spectrometer to
the detector plane. Each magnet group does not only
provide a guiding field for the electrons but also serves
additional purposes. The intermediate sections between
magnet groups as well as the magnet design itself needs to
be analyzed very carefully in order to work properly in the
whole KATRIN experiment. This paper describes
optimisation calculations performed to achieve this goal.
TUA07PO08
Preliminary Test Results of the In Achromatic
Superconducting Wiggler at NSRRC
C.H. Chang, C.S. Hwang, H.H. Chen, F.Y. Lin, M.H.
Huang, T.C. Fan, J.C. Jan, NSRRC.
Three superconducting wigglers are fabricated to provide
hard x-ray radiation for more x-ray users’ needs at NSRRC.
The design effective wiggler field is 3.1 T for a 61-mm
period at pole gap width of 19 mm. 16 racetrack-shaped
coils, made of high performing NbTi, are enclosed and
prestressed in an aluminum housing. The design of magnet
and cryostat system is described in this work. The
magnetic pole has important magnetic function. 5-pole
prototype magnets with various pole materials from low
carbon steel, vanadium permendure steel and holmium are
tested and verified the magnetic field performance. We
present the performances of the prototype of compact
superconducting wiggler.
TUA07PO09
Manufacture and test of the 5T superconducting
undulator for the LHC synchrotron radiation profile
monitor
R. Maccaferri, D. Tommasini, W. Venturini Delsolaro, S.
Bettoni, CERN.
NbTi superconducting undulators will be used in the LHC
as a key part of the Synchrotron Radiation Profile Monitor
System. Two undulators are needed, one per each
circulating beam, providing 5 T in a 60 mm bore over two
periods of 280 mm each. A full scale prototype has been
designed and successfully tested in the end of 2004. In this
paper, the electromagnetic and the mechanical design of
the undulator are summarized. The fabrication of the
prototype is described and the cold test results, both power
test and field measurements, are reported.
TUA07PO10
Design of the PETRA III Damping Wiggler
P.D. Vobly, A. Utkin, N. Khavin, E. Levichev, N. Zubkov,
BINP; M. Tisher, DESY.
The proposed upgrade of the PETRA storage ring will
provide the horizontal emittance of ~1 nm if a number of
damping wigglers with a total length about 80 m are
installed in two long straight sections. The paper describes
design concept of the damping wiggler, optimization of its
parameters and results of the prototype magnetic
measurements.
TUA07PO11
Extending Electromagnetic Wiggler/Undulator Magnet
made with Sheet Copper Coils to Shorter Periods
G.H. Biallas, S. Benson, T. Hiatt, G. Neil, M. Snyder
TJNAF.
Withdrawn.
TUA07PO12
The bending magnets for the proton transfer line of
CNGS
K.M. Schirm, CERN; Y. Pupkov, V. Anashin, A. Ogurtsov,
E. Ruvinsky, K. Zhilyaev, V. Maraev, O. Kiselev, BINP; Y.
Konstantinov, V. Peregud, EFREMOV.
The project “CERN neutrinos to Gran Sasso (CNGS)”, a
collaboration between CERN and the INFN (Gran Sasso
Laboratory) in Italy, will study neutrino oscillations in a long
base-line experiment. High energy protons will be extracted
from the CERN SPS accelerator, transported through a
727 m long transfer line and focussed onto a graphite
target to produce a beam of pions and kaons and
subsequently neutrinos. The transfer line requires a total of
78 dipole magnets. They were produced in the framework
of an in-kind contribution of Germany via (3)DESY to the
CNGS project. The classical dipoles, built from laminated
steel cores and copper coils, have a core length of 6.3 m, a
37 mm gap height and a nominal field range of 1.38 T –
1.91 T at a maximum current of 4950 A. The magnet was
designed in collaboration between (2)CERN and (1)BINP.
69 MT-19 2005, Genova