NDLI: Correcting the LHC /spl beta/* at collision

Content Provider	IEEE Xplore Digital Library
Author	Wittmer, W. Verdier, A. Zimmermann, F.
Copyright Year	2003
Description	Author affiliation: CERN, Geneva, Switzerland (Wittmer, W.; Verdier, A.; Zimmermann, F.)
Abstract	To correct the /spl beta/* at the main collision points (IP1 and IP5) simultaneously for the two counterrotating proton beams in the Large Hadron Collider (LHC), a set of specific quadrupoles in the noncommon part of the machine is used. Due to the antisymmetric optics, several quadrupoles on each side of the insertion have to be employed. The change of /spl beta/* is accomplished by incrementing the quadrupole gradients. This set of increments is referred to as /spl beta/* tuning knob. The increments were calculated by rematching /spl beta/* in a range of /spl plusmn/20 % about the nominal value. Linear curves were fitted to the variation of increments to construct a linear tuning knob. This was done for each plane using MAD 8 and repeated with MAD X. The linear behaviour and the orthogonality of the knobs were investigated for the LHC lattices V6.2 and V6.4. Different field errors were introduced in the lattice and the correction efficiency of the knobs was studied.
Sponsorship	U.S. Dept. of Energy Office of Naval Res. Nat. Sci. Found
Starting Page	2237
Ending Page	2239
File Size	227031
Page Count	3
File Format	PDF
ISBN	0780377389
ISSN	10633928
DOI	10.1109/PAC.2003.1289077
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Large Hadron Collider Lattices Error correction Magnets Optical tuning Testing Colliding beam devices
Content Type	Text
Resource Type	Article

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