Optimization of DA/spl Phi/NE beam-beam performance

摘要

The /spl Phi/-factory DA/spl Phi/NE is an electron-positron collider with a design luminosity of 5.2*10/sup 32/ cm/sup -2/ s/sup -1/ at the energy of the /spl Phi/-resonance (1020 MeV c.m.). In order to achieve the design luminosity high current multibunch electron and positron beams are stored in two separate rings and collide in two common interaction regions. Since the beams arrive at the interaction points from the different rings, a careful longitudinal timing and precise transverse scan of the colliding bunches are necessary to optimize the collider luminosity. In this paper we describe luminosity measurement techniques adopted in DA/spl Phi/NE, discuss measures aimed at maximizing the luminosity in the beam-beam collisions and report the achieved results. The experimental data are compared with the results of numerical simulations.