NDLI: The LHC dynamic aperture

Content Provider	IEEE Xplore Digital Library
Author	Koutchouk, J.-P.
Copyright Year	1999
Description	Author affiliation: CERN, Geneva, Switzerland (Koutchouk, J.-P.)
Abstract	In 1996, the expected field errors in the dipoles and quadrupoles yielded a long-term dynamic aperture of some 8/spl sigma/ at injection. The target was set to 12/spl sigma/ to account for the limitations of our model (imperfections and dynamics). From scaling laws and tracking, a specification for the field imperfections yielding the target dynamic aperture was deduced. The gap between specification and expected errors is being bridged by (i) an improvement of the dipole field quality, (ii) a balance between geometric and persistent current errors, (iii) additional correction circuits (a/sub 3/,b/sub 4/). With the goal in view, the emphasis has now turned to the sensitivity of the dynamic aperture to the optical parameters. The distortion of the dynamics at the lower amplitudes effectively reached by the particles is minimized by optimizing the distribution of the betatron phase advance. At collision energy, the dynamic aperture is limited by the field imperfections of the low-/spl beta/ triplets, enhanced by the crossing angle. With correction of the most important aberrations, the dynamic aperture reaches the target set to 10.
Starting Page	372
Ending Page	376
File Size	564309
Page Count	5
File Format	PDF
ISBN	0780355733
DOI	10.1109/PAC.1999.795709
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-03-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Large Hadron Collider Apertures Error correction Optical distortion Target tracking Persistent currents Circuits Geometrical optics Optical sensors Phase distortion
Content Type	Text
Resource Type	Article

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