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1.
Impact and possible mitigation measures in case of failure of lattice sextupole and octupole circuits in Run 3 / Fartoukh, Stephane (CERN)
Depending on the machine configuration which is used in operation, the failure of some lattice sextupole and octupole circuits might have a substantial impact on the machine performance (βべーた∗ and beam brightness limitations). [...]
CERN-ACC-NOTE-2020-0057.
- 2020. - 25 p.
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2.
About flat telescopic optics for the future operation of the LHC / Fartoukh, Stephane (CERN) ; Karastathis, Nikos (CERN) ; Ponce, Laurette (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Tomas Garcia, Rogelio (CERN)
This report discusses and motivates the possible deployment of flat collision optics for the future operation of the LHC [...]
CERN-ACC-2018-0018.
- 2018. - 63 p.
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3.
MD2190: Q" Stabilization during injection / Schenk, Michael (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Fartoukh, Stephane (CERN) ; Li, Kevin Shing Bruce (CERN) ; Malina, Lukas (University of Oslo (NO)) ; Metral, Elias (CERN) ; Tomas Garcia, Rogelio (CERN)
This MD is a follow-up study of MD1831, where single bunches were stabilized against impedance-driven instabilities at 6.5 TeV in the LHC with Q''. [...]
CERN-ACC-NOTE-2018-0003.
- 2018. - 11 p.
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4.
Demonstration of coupling correction below the per-mil limit in the LHC / Maclean, Ewen Hamish (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Fartoukh, Stephane (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Tomas Garcia, Rogelio (CERN) ; Wierichs, David Alexander
Linear coupling between betatron motion in the transverse planes is one of the key optics parameters for any accelerator. [...]
CERN-ACC-NOTE-2016-0053.
- 2016. - 7 p.
5.
MD 3584: Long-Range Beam-Beam 2018 / Karastathis, Nikos ; Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN)
A recurrent issue of the LHC operation, observed both during Run1 and Run2 is the asymmetric behaviour of the two beams in terms of particle losses. [...]
CERN-ACC-NOTE-2020-0011.
- 2020. - 29 p.
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6.
The Right Optics Concept for the Right Dimension of the High Luminosity LHC Project / Fartoukh, Stephane (CERN)
While the LHC optics is approaching its limit in terms of beta*, not only bounded, somehow in relative, by the aperture of the existing inner triplets, but also, in absolute, by the match-ability, the flexibility and, at some point (not yet reached) the chromatic aberrations of the corresponding collision optics, the High Luminosity LHC project requests to triple or even quadruple this effort in order to meet the challenging performance target of 250 1/fb per year. This exigency, or even only half of it, cannot be satisfied without a complete change of point of view in the way low-beta* optics are thought and realized. [...]
CERN-ACC-2016-0085.- Geneva : CERN, 2017 - 17 p. - Published in : ICFA Beam Dyn. Newsl.: 71 (2017) , pp. 116-135 Fulltext: PDF;
7.
Optimal LHC optics phasing conditions for long-range beam-beam compensation and flat optics / Fartoukh, Stephane (CERN)
This note describes a new possible phasing configuration for the (HL-)LHC optics, in order to further reduce the minimum allowed distance of beam-beam wire compensators with respect to the beam. [...]
CERN-ACC-NOTE-2022-0012.
- 2022. - 17 p.
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8.
MD 2563: Optics measurement and corrections with half integer tune / Wegscheider, Andreas (Hamburg University (DE)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Fartoukh, Stephane (CERN) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) ; Persson, Tobias Hakan Bjorn (CERN) et al.
This note reports on the optics measurement and correction actions that were performed during the study of the LHC at a working point close to the half integer resonance..
CERN-ACC-NOTE-2018-0055.
- 2018. - 11 p.
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9.
Combined ramp and telescopic squeeze / Fartoukh, Stephane (CERN) ; Azzopardi, Gabriella (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Fuster Martinez, Nuria ; Iadarola, Giovanni (CERN) ; Karastathis, Nikos ; Kostoglou, Sofia (CERN) ; Maclean, Ewen Hamish (CERN) et al.
This paper highlights the outcome of the 2018 round ATS MD program, which aimed at demonstrating the feasibility of a combined ramp and telescopic squeeze as a potential key ingredient to operate the machine in Run 3, with much brighter and more energetic beams with respect to Run 2. [...]
CERN-ACC-2020-0028.
- 2020. - 40 p.
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10.
MD3263: Beam-Beam Long-Range Compensation using DC Wires in the LHC / Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Fartoukh, Stephane (CERN) ; Fuster Martinez, Nuria (CERN) ; Karastathis, Nikos (CERN) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Redaelli, Stefano (CERN) ; Rossi, Adriana (CERN) ; Skoufaris, Kyriacos (University of Crete (GR)) ; Solfaroli Camillocci, Matteo (CERN) et al.
This note summarizes the experimental results obtained during the 2018 LHC Machine Development program during the measurements campaign of the Beam-Beam Long-Range compensation using DC wires (MD3263). [...]
CERN-ACC-NOTE-2019-0053.
- 2019. - 25 p.
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