NDLI: Optics studies for the CERN Proton Synchrotron: linear and nonlinear modeling using beam based measurements

Content Provider	IEEE Xplore Digital Library
Author	Cappi, R. Giovannozzi, M. Martini, M. Metral, E. Metral, G. Steerenberg, R. Muller, A.-S.
Copyright Year	2003
Description	Author affiliation: CERN, Geneva, Switzerland (Cappi, R.; Giovannozzi, M.; Martini, M.; Metral, E.; Metral, G.; Steerenberg, R.)
Abstract	The CERN Proton Synchrotron machine is built using combined function magnets. The control of the linear tune as well as the chromaticity in both planes is achieved by means of special coils added to the main magnets, namely two pole-face-windings and one figure-of-eight loop. As a result, the overall magnetic field configuration is rather complex not to mention the saturation effects induced at top-energy. For these reasons a linear model of the PS main magnet does not provide sufficient precision to model particle dynamics. On the other hand, a sophisticated optical model is the key element for the foreseen intensity upgrade and, in particular, for the novel extraction mode based on adiabatic capture of beam particles inside stable islands in transverse phase space. A solution was found by performing accurate measurement of the nonlinear tune as a function of both amplitude and momentum offset so to extract both linear and nonlinear properties of the lattice. In this paper the measurement results are presented and the derived optical model is discussed in detail.
Sponsorship	U.S. Dept. of Energy Office of Naval Res. Nat. Sci. Found
Starting Page	2913
Ending Page	2915
File Size	222392
Page Count	3
File Format	PDF
ISBN	0780377389
ISSN	10633928
DOI	10.1109/PAC.2003.1289764
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	Nonlinear optics Protons Synchrotrons Particle beams Particle beam measurements Optical saturation Magnets Coils Magnetic field measurement Performance evaluation
Content Type	Text
Resource Type	Article

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