Overall Optics Solutions for Very High Beta in Atlas

Abstract

accelconf.web.cern.ch/accelconf/e08/papers/wepp004.pdfInternational audienceAn insertion optics with a beta-star of at least 2600 m has been requested by the ATLAS experiment at the LHC. This is very far from the standard LHC physics optics and implies a significant reduction in the phase advance from this insertion corresponding to about half a unit in tune. We describe several alternatives how this could be integrated in overall LHC optics solutions with the possibility to inject, ramp and un-squeeze to the required very high beta