NDLI: Effects of Collar Permeability on the Field Quality of the Large Aperture Quadrupoles for the LHC

Content Provider	IEEE Xplore Digital Library
Author	Lasheras, N.C. Auchmann, B. Kirby, G. Mess, K.-H. Ostojic, R. Russenschuck, S.
Copyright Year	2002
Abstract	The LHC contains a number of large aperture quadrupoles (MQY) in the insertions. The acceptance of these magnets was based on warm magnetic measurements performed before delivery to CERN. During the series production of the MQY quadrupoles, the permeability of the collars drifted from the nominal value, and effects on the transfer function and multipole components became evident. To study the effects on the magnetic field, variable permeability of the stainless-steel collars as a function of local field and temperature was introduced into a numerical model. Comparing the results with measured data, we could isolate the contribution of permeability deviation on the magnetic field quality. The extrapolation of transfer function and field multipoles to operating temperature and current gives the necessary offsets, which are compared with measurements on a reduced set of magnets.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	104
Ending Page	107
Page Count	4
File Size	652593
File Format	PDF
ISSN	10518223
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Permeability Apertures Large Hadron Collider Magnetic field measurement Magnets Transfer functions Temperature Magnetic variables measurement Performance evaluation Production permeability LHC magnetic field measurements
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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