CERN Accelerating science

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Can an extra HOM-like impedance explain the high octupole threshold at Q′ ∼ 0 in the LHC? / Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Metral, Elias (CERN)
The 2015 LHC octupole threshold measurement campaign revealed a higher Landau octupole current between the measured octupole threshold and impedance model predictions for chromaticities below few units. [...]
- 2020. - 13 p.

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Numerical simulations studies on single-bunch instabilities driven by electron clouds at the LHC / Sabato, Luca (CERN) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN)
Instabilities driven by electron clouds in the LHC are studied by means of numerical simulations performed with the PyECLOUD-PYHEADTAIL suite. [...]
- 2020. - 29 p.
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MD 3603: Dynamic Aperture with uncorrected dipole b3 / Hofer, Michael (Vienna University of Technology (AT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (Goethe University Frankfurt (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Solfaroli Camillocci, Matteo (CERN) et al.
The hadron collider options currently investigated as part of the FCC study rely on the use of dipoles with a field strength of 16 T or above in order to achieve the targeted collision energy. [...]
- 2020. - 22 p.
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MD3287: Luminosity scans with waist shifts / Coello De Portugal - Martinez Vazquez, Jaime Maria ; Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN)
This note reports on the first measurements of the beam waist displacements in the LHC using luminosity scans. [...]
- 2020. - 11 p.

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LHC injection losses for tighter collimator settings in view of HE-LHC / Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Crouch, Matthew Paul ; Goddard, Brennan (CERN) ; Molson, James (CERN) ; Redaelli, Stefano (CERN)
In view of the smaller physical apertures of Nb3Sn magnets for the HE-LHC study, a machine study was performed in the LHC to tighten correspondingly the ring and injection protection collimators and measure the change in loss behaviour. [...]
- 2020. - 10 p.

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Simulations of particle loss due to hollow e-lens and non-linearities for the HL-LHC / Cai, Rongrong (Imperial College (GB)) ; Mirarchi, Daniele (University of Manchester (GB)) ; Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH))
Simulations on the effects of an electron lens (e-lens) on the halo population depletion have been carried out for the High Luminosity LHC (HL-LHC). [...]
- 2020. - 19 p.
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Orbit Correction Studies on the HL–LHC Layout and Optics V1.5 / Andersson, Joel Daniel (Lund University (SE)) ; De Maria, Riccardo (CERN) ; Gamba, Davide (CERN)
In this report three separate studies on the topic of orbit correction are presented for the HL–LHC V1.5 layout and 15 cm β∗ optics for protons. [...]
- 2020. - 51 p.
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Space Charge simulations for the ISOLDE beam in the PS Booster with and without longitudinal painting / Albright, Simon (CERN) ; Antoniou, Fanouria (CERN) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Bracco, Chiara (CERN) ; Papaphilippou, Yannis (CERN) ; Prebibaj, Tirsi (Goethe University Frankfurt (DE)) ; Renner, Elisabeth (Vienna University of Technology (AT))
This document summarizes the space charge simulations performed for the ISOLDE beam in the PS Booster. [...]
- 2020. - 17 p.

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Design and Tuning of Secondary Beamlines in the CERN North and East Areas / Gatignon, Lau (CERN)
This document gives guidance for the design and tuning of secondary beam lines at CERN. [...]
- 2020.

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Numerical tools for Crab Cavity simulations / Alekou, Androula (University of Manchester (GB)) ; Appleby, Robert Barrie (University of Manchester (GB)) ; Bartosik, Hannes (CERN) ; Papaphilippou, Yannis (CERN)
This note gives the steps to be followed in order to include the crab cavities module in MAD-X for tracking simulations in SixTrack. [...]
- 2020. - 16 p.
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LHC MD Notes (158)