title: Simple formulas for the beam lifetime analysis in an electron storage ring.
abstract: Derived are simple and accurate formulas estimating the Touschek and beam-gas scattering lifetimes. These formulas are practical rather than theoretical. They use only the measured total beam lifetime tau and its time derivative dtau/dt to estimate the two lifetimes. The only condition required is suppression or saturation of the radiative polarization. As a demonstration, the formulas are applied to the Pohang Light Source (PLS) beam lifetime.
authors.affiliation: Pohang Accelerator Laboratory San 31, Hyoja-dong, Pohang, Kyungbuk, 790-784 Korea.
authors.forename: Tae-Yeon
authors.initials: TY
authors.lastname: Lee