| Paper |
Title |
Page |
| MPPE009 |
2003-2004 Nonlinear Optics Measurements and Modeling for the CERN SPS
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1171 |
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- A. Faus-Golfe
IFIC, Valencia
- G. Arduini, F. Zimmermann
CERN, Geneva
- R. Tomas
CELLS, Bellaterra (Cerdanyola del Vallès)
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In 2003 and 2004 nonlinear chromaticity, amplitude detuning, chromatic phase advance, resonance driving terms and off-energy orbits were measured in the CERN SPS at 14 GeV/c and 26 GeV/c, respectively. From the nonlinear chromaticity, the SPS optics model has been updated, by adjusting the strength of nonlinear field errors in dipoles and quadrupoles. Furthermore, we have added to the model the effect of the displacement of all main bends and the voluntary misalignments of all the other elements of the machine. We compare the field errors with those founded in 2002, 2001 and 2000. The tune shifts with transverse amplitude, driving terms, etc., predicted by this nonlinear optics model are compared with direct measurements.
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| TPAP003 |
Exploring a Nonlinear Collimation System for the LHC
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877 |
| |
- J. Resta, A. Faus-Golfe
IFIC, Valencia
- R.W. Assmann, S. Redaelli, G. Robert-Demolaize, D. Schulte, F. Zimmermann
CERN, Geneva
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We explore the adaptation of a nonlinear collimation system, as previously considered for linear colliders, to LHC betatron cleaning. A possible nonlinear system for LHC consists of a horizontal and vertical primary collimator located in between a pair of skew sextupoles. We discuss the modified LHC optics, the need for and optimum placement of secondary absorbers, and the simulated cleaning efficiency.
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