| Paper |
Title |
Page |
| WEPP003 |
Optics Flexibility in the LHC at Top Energy
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2524 |
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- M. Aiba, H. Burkhardt, S. D. Fartoukh, M. Giovannozzi, S. M. White
CERN, Geneva
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We report on studies of optics flexibility which allow for tune changes of the order of half a unit at top energy in the LHC. We describe how this could be done using one or several of the insertions IR2, IR4, IR8 or the main quadrupoles and discuss and compare the implications. This flexibility could be used to compensate for the loss in tune for high beta optics and may make it feasible to use the standard injection and ramp for these configurations. Potential further applications are also highlighted.
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| WEPP004 |
Overall Optics Solutions for Very High Beta in Atlas
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2527 |
| |
- S. M. White, H. Burkhardt, P. M. Puzo
CERN, Geneva
- S. Cavalier, M. Heller
LAL, Orsay
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An insertion optics with a beta-star of at least 2600 m has been requested by the ATLAS experiment at the LHC. This is very far from the standard LHC physics optics and implies a significant reduction in the phase advance from this insertion corresponding to about half a unit in tune. We describe several alternatives how this could be integrated in overall LHC optics solutions with the possibility to inject, ramp and un-squeeze to the required very high beta.
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| WEPP005 |
Measurements and Effects of the Magnetic Hysteresis on the LHC Crossing Angle and Separation Bumps
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2530 |
| |
- N. J. Sammut, H. Burkhardt, C. Giloux, W. Venturini Delsolaro, S. M. White
CERN, Geneva
- N. J. Sammut
University of Malta, Faculty of Engineering, Msida
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The superconducting orbit corrector magnets (MCBC and MCBY) in the Large Hadron Collider (LHC) at CERN will be used to generate parallel separation and crossing angles at the interaction points during the different phases that will bring the LHC beams into collision. However, the field errors generated by the inherent hysteresis in the operation region of the orbit correctors may lead to unwanted orbit perturbations that could have a critical effect on luminosity. This paper presents the results obtained from dedicated cryogenic measurements on the orbit correctors from the simulated results on the impact of the hysteresis on the LHC orbit.
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