Abstracts Brochure - CERN

WEPLS101
WEPLS102
WEPLS103
28-Jun-06 16:00 - 18:00 WEPLS — Poster Session
Computation of Parasitic Fields in the LHC
A. Devred, B. Auchmann, Y. Boncompagni, V. Ferapontov, J.-P.
Koutchouk, S. Russenschuck, T. Sahner, C. Vollinger (CERN)
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The Large Hadron Collider (LHC), now
under construction at CERN, will rely on
about 1600 main superconducting dipole and
quadrupole magnets and over 7400 super-
conducting corrector magnets distributed around the eight sectors of the machine. Each type of magnets is powered
by dedicated superconducting busbars running along each sector and passing through the iron yokes of the main
dipole and quadruple magnets. In the numerous magnet interconnects, the busbars are not magnetically shielded
from the beam pipes and produce parasitic fields that can affect beam optics. We review the 3D models which have
been built with the ROXIE software package to evaluate these parasitic fields and we discuss the computation results
and their potential impacts on machine performance.
The Construction of the Superconducting Matching Quadrupoles for the LHC Insertions
R. Ostojic, N. Catalan-Lasheras, G. Kirby, J.C. Perez, H. Prin, W.
Venturini Delsolaro (CERN)
After several years of intensive effort, the
construction of the superconducting matching
quadrupoles for the LHC insertions is
nearing completion. We retrace the main
events of the project from the initial development of quadrupole magnets of several types to the series production
of over 100 complex cryo-magnets, and report on the techniques developed for steering of the production. The
main performance parameters for the full series, such as quench training, field quality and magnet geometry are
presented. The experience gained in the production of these special superconducting magnets is of considerable
value for further development of the LHC insertions.
The Field Description Model for the LHC Quadrupole Superconducting Magnets
N.J. Sammut, L. Bottura, S. Sanfilippo (CERN) J. Micallef (University
of Malta, Faculty of Engineering)
The LHC control system requires an accurate
forecast of the magnetic field and the
multipole field errors to reduce the burden
on the beam-based feed-back. The Field De-
scription for the LHC (FIDEL) is the core of this forecast system and is based on the identification and physical
decomposition of the effects that contribute to the total field in the magnet apertures. The effects are quantified using
the data obtained from series magnetic measurements at CERN and they are consequently modelled empirically
or theoretically depending on the complexity of the physical phenomena. This paper presents a description of the
methodology used to model the field of the LHC magnets particularly focusing on the results obtained for the LHC
Quadrupoles (MQ, MQM and MQY).