New Methods for Measurement of Nonlinear Errors in LHC Experimental IRs and Their Application in the HL-LHC

Ewen Maclean, Felix Carlier, Jaime Maria Coello De Portugal, Ana Garcia-Tabares, Massimo Giovannozzi, Lukas Malina, Tobias Persson, Piotr Skowroński, Rogelio Tomás, Arduini, Gianluigi (Ed.), Pranke, Juliana (Ed.), Seidel, Mike (Ed.) (+2 others)
Studies of nonlinear errors in LHC experimental insertions (IRs) during Run 1 were based upon feed-down to tune and coupling from the crossing angle orbit bumps. Useful for validating the magnetic model, this method alone is of limited use to understand discrepancies between magnetic and beam-based measurement. Feed-down from high-order multipoles is also difficult to observe. During Run 2 several alternative methods were tested in the LHC. This paper summarizes the results of these tests, and
more » ... f these tests, and comments on their potential application to the High-Luminosity LHC upgrade.
doi:10.18429/jacow-ipac2017-wepik093 fatcat:wsrzrt446zej5l2cbvkcxbbdta