Luminosity and Tune Shift in e + e - Storage Rings
نویسنده
چکیده
Luminosity and tune shift have been the subject of numerous papers and talks since the invention of electron-positron storage rings. In this paper we derive an equation for luminosity and one for the linear tune shift based upon two simple assumptions. The first assumption is that the storage ring be designed such that the linear tune shifts in the two transverse planes, x and y, are equal; i.e., that Au, = Au,. The second assumption is that the max imum acceptable disruption angle, 00, of the colliding beams is approximately equal to the “natural” beam spread, 0~, of the stored colliding beams at the interaction point. ,m
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2 00 1 Simulation of Beam - Beam Effects in e + e − Storage Rings ∗
The beam-beam effects of the PEP-II as an asymmetric collider are studied with strong-strong simulations using a newly developed particle-in-cell (PIC) code[1]. The simulated luminosity agrees with the measured one within 10% in a large range of the beam currents. The spectra of coherent dipole oscillation are simulated with and without the transparency symmetry. The simulated tune shift of the...
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