Publications by Riccardo Bartolini

A fast optics correction for the diamond storage ring

IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (2014) 1763-1765

IPS Martin, M Abbott, M Furseman, G Rehm, R Bartolini

Copyright © 2014 CC-BY-3.0 and by the respective authors. Since March 2013, the Diamond storage ring has been operated with a target vertical emittance of 8 pm.rad. This condition is achieved by first applying a LOCO [1] optics correction with IDs set to their typical gaps, then offsetting the skew quadrupole magnets in order to increase the vertical emittance again to the desired value. Whilst a feedback application [2] is able to stabilise the vertical emittance during ID gap and phase changes in the short to medium term, regular applications of LOCO are still required to maintain good coupling control in the longer term. In this paper we describe measures taken to speed up the optics correction procedure, including a fast orbit response matrix measurement, a reduction of the number of magnets used to measure the data, and a distribution of the LOCO calculations to run in parallel.

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