NDLI: Compensation of the "Pacman" tune spread by tailoring the beam current

Content Provider	IEEE Xplore Digital Library
Author	Furman, M.A.
Copyright Year	1995
Description	Author affiliation: Div. of Accel. & Fusion Res., Lawrence Berkeley Lab., CA, USA (Furman, M.A.)
Abstract	"Factory"-like e/sup +/-e/sup -/-colliders presently under design or construction achieve high luminosity by resorting to large numbers of closely-spaced bunches. The short bunch spacing implies that there are unavoidable parasitic collisions (PCs) in the neighborhood of the interaction point (IP). Since the bunch population of the beam is not uniform due to an intentional ion-clearing gap, the bunches at the head or tail of the train ("pacman bunches") experience different beam-beam tune shifts than those away from the edges ("typical bunches"). We present here a method to minimize the vertical tune spread at the expense of increasing the horizontal tune spread (we assume that there is only one IP). Since the beam-beam dynamics for flat beams typically tolerates a significantly higher horizontal tune spread than a vertical tune spread, this method implies a net advantage. We present our discussion in the context of the PEP-II collider.
Starting Page	2916
Ending Page	2918
File Size	312560
Page Count	3
File Format	PDF
ISBN	0780329341
DOI	10.1109/PAC.1995.505736
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	Structural beams Personal communication networks Magnetic heads Positrons Tail Electron beams Colliding beam accelerators Laboratories Magnetic separation Particle beams
Content Type	Text
Resource Type	Article

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