| Paper |
Title |
Page |
| WEPCH045 |
Sorting Strategies for the Arc Quadrupoles of the LHC
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2017 |
| |
- Y. Papaphilippou, A.M. Lombardi
CERN, Geneva
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The variation in the field gradient of the LHC arc quadrupoles can not be corrected independently by the dedicated trim quadrupole circuits. This may result to a beta function beating larger than the one accepted by the machine budget. In this respect, sorting strategies for the installation of these magnets were implemented in order to eliminate this effect, as locally as possible. Special care was taken for quadrupoles whose warm measurements showed large gradient errors due to an excessive magnetic permeability. The figures of merit used in the sorting and the results obtained for all 8 sectors of the LHC are detailed. The global optics function beating foreseen, as computed by both analytical estimates and simulations with MAD-X are finally presented.
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| WEPCH047 |
Procedures and Accuracy Estimates for Beta-beat Correction in the LHC
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2023 |
| |
- R. Tomas, O.S. Brüning, S.D. Fartoukh, M. Giovannozzi, Y. Papaphilippou, F. Zimmermann
CERN, Geneva
- R. Calaga, S. Peggs
BNL, Upton, Long Island, New York
- F. Franchi
GSI, Darmstadt
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The LHC aperture imposes a tight tolerance of 20% on the maximum acceptable beta-beat in the machine. An accurate knowledge of the transfer functions for the individually powered insertion quadrupoles and techniques to compensate beta-beat are key prerequisites for successful operation with high intensity beams. We perform realistic simulations to predict quadrupole errors in LHC and explore possible ways of correction to minimize beta-beat below the 20% level.
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| WEPCH092 |
Dynamical Aperture Studies for the CERN LHC: Comparison between Statistical Assignment of Magnetic Field Errors and Actual Measured Field Errors
|
2128 |
| |
- M. Giovannozzi, S.D. Fartoukh, S.S. Gilardoni, J.-B. Jeanneret, A.M. Lombardi, Y. Papaphilippou, T. Risselada, R. de Maria
CERN, Geneva
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It is customary to evaluate the performance of a circular particle accelerator by computing the dynamical aperture, i.e., the domain in phase space where bounded single-particle motion occurs. In the case of the LHC the dynamical aperture computation is performed by assuming a statistical distribution of the magnetic field errors of various magnets' classes: the numerical computations are repeated for a given set of realisations of the LHC ring. With the progress in the magnet production and allocation of the available positions in the ring, the statistical approach has to be replaced by the computation of one single configuration, namely the actual realisation of the machine. Comparisons between the two approaches are presented and discussed in details.
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| WEPCH141 |
Accelerator Physics Code Web Repository
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2254 |
| |
- F. Zimmermann, R. Basset, E. Benedetto, U. Dorda, M. Giovannozzi, Y. Papaphilippou, T. Pieloni, F. Ruggiero, G. Rumolo, F. Schmidt, E. Todesco
CERN, Geneva
- D.T. Abell
Tech-X, Boulder, Colorado
- R. Bartolini
Diamond, Oxfordshire
- O. Boine-Frankenheim, G. Franchetti, I. Hofmann
GSI, Darmstadt
- Y. Cai, M.T.F. Pivi
SLAC, Menlo Park, California
- Y.H. Chin, K. Ohmi, K. Oide
KEK, Ibaraki
- S.M. Cousineau, V.V. Danilov, J.A. Holmes, A.P. Shishlo
ORNL, Oak Ridge, Tennessee
- L. Farvacque
ESRF, Grenoble
- A. Friedman
LLNL, Livermore, California
- M.A. Furman, D.P. Grote, J. Qiang, G.L. Sabbi, P.A. Seidl, J.-L. Vay
LBNL, Berkeley, California
- D. Kaltchev
TRIUMF, Vancouver
- T.C. Katsouleas
USC, Los Angeles, California
- E.-S. Kim
PAL, Pohang, Kyungbuk
- S. Machida
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. Payet
CEA, Gif-sur-Yvette
- T. Sen
Fermilab, Batavia, Illinois
- J. Wei
BNL, Upton, Long Island, New York
- B. Zotter
Honorary CERN Staff Member, Grand-Saconnex
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In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this web repository, illustrate its usage, and discuss our future plans.
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