| Paper |
Title |
Page |
| MOPJE034 |
Low Emittance Tuning for the CLIC Damping Rings |
356 |
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- J. Alabau-Gonzalvo, F. Antoniou, Y. Papaphilippou
CERN, Geneva, Switzerland
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A study on the sensitivity of the CLIC Damping Ring lattice to different sources of misalignment is presented. Dipole and quadrupole rolls, quadrupole and sextupole vertical offsets are considered, as well as the impact of a finite BPM resolution. The result of this study defines a low emittance tuning procedure and establishes alignment tolerances to preserve the vertical emittance below the design value (1 pm·rad). Non-linear dynamics studies including dynamic aperture and frequency maps are shown and synchrotron radiation effects are discussed.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE034
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| TUPJE042 |
Transverse Tunes Determination from Mixed BPM Data |
1709 |
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- P. Zisopoulos, F. Antoniou, Y. Papaphilippou
CERN, Geneva, Switzerland
- E. Hertle, A.-S. Müller
KIT, Eggenstein-Leopoldshafen, Germany
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Decoherence due to non-zero chromaticity and/or amplitude dependent tune-shift, but also damping mechanisms can affect the accurate tune determination by leaving a limited number of turns for frequency analysis of the turn by turn (TbT) position data. In order to by-pass these problems, Fourier analysis of mixed TBT data from all BPMs can be employed. The approach is applied in two different accelerators, a hadron collider as the LHC and a synchrotron light source as the ANKA storage ring. The impact in the accuracy of the method of missing BPM data is also discussed.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE042
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| TUPTY020 |
Building a Luminosity Model for the LHC and HL-LHC |
2042 |
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- F. Antoniou, G. Arduini, Y. Papaphilippou, G. Papotti
CERN, Geneva, Switzerland
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One key objective of the High Luminosity LHC Upgrade is to determine a set of beam parameters and the hardware configuration that will enable the LHC to reach a peak luminosity of 5×1034 cm-2 s-1 and ultimately 7.5x1034 cm-2 s-1 with levelling, allowing an integrated luminosity of 250-300 fb-1 per year. In order to determine the integrated performance it is important to develop a realistic model of the luminosity evolution during a physics fill. In this paper, the different mechanisms affecting luminosity lifetime in the LHC are discussed and a luminosity model is presented. The model is benchmarked with data from LHC Run I.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY020
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| TUPTY022 |
Alternative Optics Design of the CLIC Damping Rings with Variable Dipole Bends and High-field Wigglers |
2046 |
| |
- P.S. Papadopoulou, F. Antoniou, Y. Papaphilippou
CERN, Geneva, Switzerland
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The CLIC Damping Rings baseline design aims to reach an ultra-low horizontal normalised emittance of 500nm-rad at 2.86GeV, based on the combined effect of TME arc cells and high-field super-conducting damping wigglers, while keeping the ring as compact as possible. In this paper, an alternative design is described, based on TME cells with longitudinally variable bends and an optimized Nb3Sn high-field wiggler. The impact of these changes on ring optics parameters and the associated optimisation steps are detailed taking account the dominant effect of intrabeam scattering.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY022
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