| Paper |
Title |
Page |
| TUPD031 |
Crystals Application in the TOTEM Experiment to Increase the Acceptance of a Roman Pot
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1491 |
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- E. Laface, W. Scandale
CERN, Geneva
- S. Hasan
Univ. Insubria and INFN Milano, Como
- C. Santoni
Université Blaise Pascal, Clermont-Ferrand
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Bent crystal may enhance the physics reach of a near-beam physics detector in the CERN-LHC, by increasing the acceptance of scattered protons in low transverse momentum reactions. As an example we present simulations demonstrating the increase of the Roman Pot acceptance in the TOTME apparatus. Starting from the MadX v6.5 nominal optic, a crystal is placed at different longitudinal and transversal positions: for each scheme a gaussian beam of protons with different kinematic variables is created and tracked along the optical line with crystal. The number of protons with transversal coordinates greater than 10σ+0.5mm, that is inside the Roman Pot, is compared with the total number of protons. The possible gain in acceptance is around 15-20%.
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| THPC021 |
Investigations on a Q0 Doublet Optics for the LHC Luminosity Upgrade
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3023 |
| |
- E. Laface, W. Scandale, E. Y. Wildner
CERN, Geneva
- C. Santoni
Université Blaise Pascal, Clermont-Ferrand
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The Q0 scheme of the LHC insertion region is based on the introduction of a doublet of quadrupoles at 13 meters from IP. We present here the doublet optics and the magnets layout such as gradients, lengths, positions and apertures. In this scheme we show the gain in luminosity and chromaticity, with respect to a nominal layout with β*=0.25 (i.e. LHC phase 1 upgrade) and β*=0.15 m, due to a smaller beta-max. We show the alignment tolerance and the energy deposition issues, in Q0A-Q0B. We also consider shielding the magnets with liners. The capability of Q0 optics to limit the β function could be exploited after the LHC Phase 1 upgrade in order to reduce the β* below 0.25 m, leaving the upgraded triplet unchanged.
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