NDLI: Measurement of chromatic effects in LEP

Content Provider	IEEE Xplore Digital Library
Author	Brandt, D. Castro, P. Cornelis, K. Hofmann, A. Morpurgo, G. Sabbi, G.L. Verdier, A.
Copyright Year	1995
Description	Author affiliation: CERN, Geneva, Switzerland (Brandt, D.; Castro, P.; Cornelis, K.; Hofmann, A.; Morpurgo, G.; Sabbi, G.L.; Verdier, A.)
Abstract	The chromaticity produced by the insertions and the lattice of LEP is corrected in the FODO lattice of the arcs which has horizontal and vertical phase advances of 90/spl deg/ and 60/spl deg/ for the LEP optics presently used. This is done with two horizontal and three vertical sextupole families. To check this correction scheme the non-linear chromaticities have been measured by observing the betatron tunes as a function of RF-frequency, i.e. of momentum deviation. The differences between the results and the expected effects of the sextupoles are interpreted in terms of octupole and decapole components in the dipole magnets. To check the distribution around the ring of the chromaticities and their corrections the betatron phase advances have been measured as a function of momentum deviation. This was done by observing an excited betatron oscillation for 1024 turns in all beam position monitors for different RF-frequencies. The results clearly show the negative chromaticity produced in the straight sections and its correction in the arcs. The parasitic sextupole components are found to be spread uniformly in the arcs within the measurement errors. Under this condition one finds that they have a negligible effect on the dynamic aperture.
Starting Page	2841
Ending Page	2843
File Size	334007
Page Count	3
File Format	PDF
ISBN	0780329341
DOI	10.1109/PAC.1995.505711
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-05-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Lattices Nonlinear optics Magnets Phase measurement Measurement errors Apertures Nonlinear optical devices Damping Frequency measurement
Content Type	Text
Resource Type	Article

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