Title :
Effects of vertical aperture on beam lifetime at the Advanced Photon Source (APS) storage ring
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
When a positron´s energy deviation δE/E exceeds the RF acceptance, or when it receives an angular kick for the betatron motion that exceeds some limiting admittance, the positron will be lost. The main contributions to the total beam lifetime come from single Coulomb and Touschek scattering. In this report we investigate the dependence of the residual gas pressure and the vertical aperture of the Advanced Photon Source storage ring on the total beam lifetime. We present results of calculating the total beam lifetime as a function of vertical aperture for varying average ring pressure, beam current, and coupling coefficient
Keywords :
electron accelerators; particle beam diagnostics; storage rings; APS; Advanced Photon Source; Coulomb scattering; RF acceptance; Touschek scattering; average ring pressure; beam current; betatron motion; coupling coefficient; positron energy; residual gas pressure; total beam lifetime; vertical aperture; Admittance; Apertures; Frequency; Impedance; Laboratories; Light scattering; Optical coupling; Particle scattering; Positrons; Storage rings;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505901
