Preliminary background calculation for DAΦNE, INFN-LNF-93 Note IR-2

This note summarizes my work while I was at the Istituto Nazionale di Fisica Nucleare (INFN) at Frascati, Italy. It presents a preliminary investigation of detector backgrounds from the DAΦNE machine that used some of the software tools developed at SLAC to study similar detector background issues for the SLAC PEP-II B factory design [1].Two sources of background were looked at: Synchrotron Radiation (SR) and degraded beam particles from beam-gas bremsstrahlung and Coulomb scattering. The critical energy of the SR generated by the beams is so low that there is no detector background from these photons. The radiation produces some heating of the beam pipe (1–2 W) near the Interaction Point (IP). Background from degraded beam particles primarily comes from the drift region between 2.5 and 5 m from the IP with a smaller contribution from the region that is 6.5 to 10 m upbeam of the IP. SYNCHROTRON RADIATION My initial effort at Frascati was to familiarize myself with the details of the Interaction Region (IR) design and to estimate backgrounds from SR generated by the incoming beams. The SR part of the study assumes a zero emittance beam (εx = εy = 0). The finite size of the beam