Abstracts Brochure - CERN

WEPLS066
WEPLS067
WEPLS068
28-Jun-06 16:00 - 18:00 WEPLS — Poster Session
1.006. However, for the dipoles where the specified maximum relative dipole field variation is ± 1x10-3, the decay
of the good field region is more gradual and would safely permit a material with relative permeability >1.006 to be
used for the vacuum vessel within these dipoles.
Harmonic Measurement and Adjustment of Diamond Quadrupoles
C.P. Bailey, N. Marks (Diamond) F. Goldie, B. Leigh (Tesla Engineering
Limited)
352
The 254 quadrupole magnets for Diamond,
manufactured by Tesla Engineering Ltd,
were measured for harmonic content to a
level around 1 part in 104. In order to meet
the demanding requirements on field quality, procedures were then developed to adjust the relative positions of the
magnet quadrants such that the desired harmonic levels were achieved. This process was integrated into the analysis
software so that the needed changes were specified. The measurements were performed on a seven-coil rotating coil
rig, which also enabled the alignment of the magnet in five spatial degrees of freedom to the specified accuracy. In
this report we describe the measurement and correction procedures and present a summary of the results that were
obtained.
Magnets for the 3 GeV Booster Synchrotron for the Diamond Light Source
S.P. Mhaskar, C.P. Bailey, G.M.A. Duller, V.C. Kempson, N. Marks
(Diamond) F. Bødker, N. Hauge, L.H. Helmersen (Danfysik A/S)
The Diamond Booster is a full energy injector
for the Diamond Storage Ring. It is designed
to accelerate electrons from 100 MeV to 3 GeV
at a 5 Hz repetition rate. The lattice is a miss-
ing dipole FODO lattice consisting of 22 unit cells with 36 dipoles, 44 quadrupoles, 28 sextupoles and 44 correctors,
distributed around a circumference of 158.4 m. The dipole field will be ramped from 0.026 T at injection to 0.809 T at
3 GeV; the quadrupoles will have a maximum operating gradient of 15T/m. The initial design of pole tip profiles was
carried at Diamond, with the magnets then manufactured by DANFYSIK A/S as part of preassembled girder units
(44 in total), complete with vacuum vessels. High quality was required to meet the accelerator physics requirements
of alignment, positioning accuracies and field tolerances over the required good field apertures. Materials, ramp rates
and field range have been selected to obtain almost linear response during magnet ramping. This paper describes the
main features of the magnetic designs and measurement results; the magnets have now been delivered and installed
at Diamond.
The IASA Magnetic Field Mapping (MFM) Project
E.P. Pournaras, A. Karabarbounis, C.N. Papanicolas, E. Stiliaris
(IASA)
The design and development of an automatic
magnetic field mapping device as supporting
equipment for the 10 MeV CW-Linac and its
transport system at the Institute of Acceler-
ating Systems and Applications (IASA) is presented. The MFM project aims to totally automate the operation of
mapping room temperature magnetic field sources, reconstruct the 3D-field shape and reveal nonlinearities in the
fridge field regions. The positioning system covers an area of 50x50 cm2 with an accuracy of less than 20 ?m in both
axes; magnetic field measurements, mainly based on a Hall probe, can reach in precision the 1x 10 -4 value. Several
software tools for the visualization of the measured fields and for a direct comparison with theoretical estimates are
also presented.