Radiation and Thermal Analysis of Superconducting Quadrupoles in the Interaction Region of Linear Collider*

CERN has encouraged the US-LARP collaboration to participate in Phase I of the LHC luminosity upgrade by analyzing the benefits gained by using Nb3Sn technology to replace the functionality of select NbTi magnets that CERN is committed to construct. Early studies have shown that the much higher gradients (shorter magnetic lengths) and temperature margins (quench stability) of Nb3Sn magnets compared to their NbTi counterparts is favorable -allowing the insertion of additional absorbers between Q1 and Q2, for example. This paper discusses the relative merits of the NbTi and Nb3Sn options. Work supported by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. Presented paper at the 11 European Particle Accelerator Conference, Genoa, Italy, June 23-27, 2008. Work supported in part by US Department of Energy contract DE-AC02-76SF00515. SLAC-PUB-14636