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Abstracts Brochure - CERN

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WEPLS101<br />

WEPLS102<br />

WEPLS103<br />

28-Jun-06 16:00 - 18:00 WEPLS — Poster Session<br />

Computation of Parasitic Fields in the LHC<br />

A. Devred, B. Auchmann, Y. Boncompagni, V. Ferapontov, J.-P.<br />

Koutchouk, S. Russenschuck, T. Sahner, C. Vollinger (<strong>CERN</strong>)<br />

362<br />

The Large Hadron Collider (LHC), now<br />

under construction at <strong>CERN</strong>, will rely on<br />

about 1600 main superconducting dipole and<br />

quadrupole magnets and over 7400 super-<br />

conducting corrector magnets distributed around the eight sectors of the machine. Each type of magnets is powered<br />

by dedicated superconducting busbars running along each sector and passing through the iron yokes of the main<br />

dipole and quadruple magnets. In the numerous magnet interconnects, the busbars are not magnetically shielded<br />

from the beam pipes and produce parasitic fields that can affect beam optics. We review the 3D models which have<br />

been built with the ROXIE software package to evaluate these parasitic fields and we discuss the computation results<br />

and their potential impacts on machine performance.<br />

The Construction of the Superconducting Matching Quadrupoles for the LHC Insertions<br />

R. Ostojic, N. Catalan-Lasheras, G. Kirby, J.C. Perez, H. Prin, W.<br />

Venturini Delsolaro (<strong>CERN</strong>)<br />

After several years of intensive effort, the<br />

construction of the superconducting matching<br />

quadrupoles for the LHC insertions is<br />

nearing completion. We retrace the main<br />

events of the project from the initial development of quadrupole magnets of several types to the series production<br />

of over 100 complex cryo-magnets, and report on the techniques developed for steering of the production. The<br />

main performance parameters for the full series, such as quench training, field quality and magnet geometry are<br />

presented. The experience gained in the production of these special superconducting magnets is of considerable<br />

value for further development of the LHC insertions.<br />

The Field Description Model for the LHC Quadrupole Superconducting Magnets<br />

N.J. Sammut, L. Bottura, S. Sanfilippo (<strong>CERN</strong>) J. Micallef (University<br />

of Malta, Faculty of Engineering)<br />

The LHC control system requires an accurate<br />

forecast of the magnetic field and the<br />

multipole field errors to reduce the burden<br />

on the beam-based feed-back. The Field De-<br />

scription for the LHC (FIDEL) is the core of this forecast system and is based on the identification and physical<br />

decomposition of the effects that contribute to the total field in the magnet apertures. The effects are quantified using<br />

the data obtained from series magnetic measurements at <strong>CERN</strong> and they are consequently modelled empirically<br />

or theoretically depending on the complexity of the physical phenomena. This paper presents a description of the<br />

methodology used to model the field of the LHC magnets particularly focusing on the results obtained for the LHC<br />

Quadrupoles (MQ, MQM and MQY).

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