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variation in such high field zone. Experiment done on the
reference Dipole Magnet also shows that a significant field
variation could be achieved by changing the vertical
position of the coils at the higher field level whereas it has
little impact in the low excitation as predicted. In this paper
we present the role of coil position to compensate the
strength variations related to the magnetic property of the
core material at higher field.
MOA07PO09
Testing and Magnetic Measurements of the SOLEIL
Booster Quadrupole Magnets
S.M. Gurov, B. Sukhina, BINP; T. Bouillie, A. Dael, A.
Loulergue, SOLEIL.
The BINP has produced 52 quadrupole magnets for
SOLEIL Booster. The results of testing and magnetic
measurements are presented.
MOA07PO10
Eddy current reduction in fast ramped bending
magnets
M. Negrazus, D. George, PSI Paul-Scherrer-Institute.
At the Paul-Scherrer-Institue (PSI/Switzerland) a new
proton gantry for cancer treatment is planned. A fast 3
dimensional scanning technique of the tumour volume is
part of the medical highlights of this new gantry. The gantry
will be driven by the new COMET proton cyclotron, which
will deliver a cw proton beam. The energy of this beam will
be adjusted by a fast degrader device. All beam line
magnets should follow the energy changes of the degrader
as fast as possible to reduce the time of the cancer
treatment. Therefore the eddy current effects in the
laminated bending magnets of the beam line and the
gantry had to be reduced by an appropriate magnet design.
The poster shows measurements and numerical
simulations of the dynamic behaviour of the fast switched
bending magnets and design schemes for eddy current
reduction in the bending magnets.
MOA07PO11
Eddy Current Effect in NiFe laminations on Pulsed
Septum Magnet Response of Indus-22
R.S. Schinde, P. Pareek, R.R. Yadav, V. Gaud, R.K.
Mishra, S. Kotaiah, Head Ferrite Lab., MDL, CAT.
A thin & thick active type Pulsed Septum Magnets has
been developed for 700 MeV e beam injection into 2.5 GeV
Storage Ring(2.5 GeV).A magnet yoke is made of 0.1 mm
thick Ni-Fe laminations.Since the current flux lines close on
it,the eddy current circulates confined within a
lamination.This result in change in impedance due to
incomplete cancellation of magnetic field. NiFe laminations
(36%Ni+ bal Fe),Indian make have been oxidized so the
pulse will penetrate into laminations at all during the
pulse.A test bench has been built to measure pulse
response of lamination at microsecond half sine
wave.Magnetic simulation of septum magnets were
performed using Flux 2D transient Software.A Septum
magnets were excited by 50 microsecond half sine wave.A
pulsed magnetic field of 1T & 0.5T for Thick & Thin Septm
magnets were obtained.A Pulse field homogeneity in the
order of 100 PPM & Integrated stray field 0.7 G-m has
been obtained,which is less than allowed 2 G-m value.An
excellent field stability on top 100 PPM has been observed.
Measured response of the magnet are well satisfied with
the design requirements.Our Measurement indicate no
influence of the septum leakage field on the closed orbit of
beam. This paper presents Eddy current effect in
laminations on pulse magnetic field at working pulse
frequency,,modeling of septum magnet, shield designs,
fabrication techniques, distribution of stray field outside of
septum & pulse magnetic field homogenity in gap of
Septum magnets.
MOA07PO12
Fabrication and Testing of a Combined
Superconducting Magnet for the TESLA Test Facility
F. Toral, P. Abramian, J.L. Gutierrez, E. Rodriguez, S.
Sanz, C. Vazquez, CIEMAT; L. Garcia-Tabares, J. Calero,
CEDEX; H. Brueck, W. Maschmann, DESY.
An international collaboration at DESY is currently studying
the possibilities of a new type of particle accelerator: the
superconducting linear collider, developed under the
project name TESLA. The TESLA Test Facility is trying to
establish a well-developed collider design, which will also
be helpful for the design of a superconducting X-Ray Free
Electron Laser facility, a project approved by the German
Government and now in its initial stage. This paper is about
the fabrication and testing of the first prototype of a
combined superconducting magnet for focusing and
steering purposes, in the framework of the Spanish
contribution to TESLA project. It consists of a quadrupole
and two dipole concentric coils, one horizontal and another
one, vertical. The double pancake winding technique with a
ribbon of eight pre-glued wires has been used in order to
develop a cheap method for industrial scale, as the
accelerator would need about 800 magnets. The coils were
fully instrumented with voltage taps to study the quench
starting location. The magnet has been successfully tested
at DESY and the results are presented in this paper.
POSTER SESSION 13:30 – 15:30
MAGNET MEASUREMENTS
MOA08PO01
A Rotating Coil Apparatus with Sub-Micron Magnetic
Center Measurement Stability
C. Spencer, S.D. Anderson, D. Jensen, Z. Wolf, SLAC.
A rotating double coil apparatus has been designed and
built so that the relative magnetic center change of a
quadrupole is measured to an uncertainty smaller than
0.02 micron for a single measurement. Furthermore,
repeated measurements over about an hour vary by less
than 0.1 micron and by less than 1 micron for periods of 24
hrs or longer. Correlation analyses of long data runs show
that the magnet center measurement is sensitive to
mechanical effects, such as vibration and rotating part
wear, as well as to environmental effects, such as
temperature and relative humidity. Evolving apparatus
design has minimized mechanical noise and environmental
isolation has reduced the effects of the surrounding
environment so that sub-micron level measurement
uncertainties and micron level stability have been achieved
for multi-day measurement periods. Apparatus design
evolution will be described in detail and correlation data
taken on water-cooled electromagnet and adjustable
permanent quadrupoles, which are about 350 mm in
length, will be shown. These quads were prototypes for the
linac quads of the Next Linear Collider (NLC) that had to
meet the requirement that their magnetic centers change
less than 1 micron during a 20% change in field strength.
Thus it was necessary to develop an apparatus that could
track the magnetic center with a fraction of a micron
uncertainty.
37 MT-19 2005, Genova