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2020-10-27
17:01
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∗ and beam brightness limitations). [...]
CERN-ACC-NOTE-2020-0057. - 2020. - 25 p.
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2020-10-27
16:18
MD2490 – Measurement of the TMCI threshold at flat-top in the LHC / Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fuchsberger, Kajetan ; Mereghetti, Alessio ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
This report summarizes the results of MD2490 on the measurement of the intensity threshold of the Transverse Mode Coupling Instability (TMCI) in the LHC at flat top. [...]
CERN-ACC-NOTE-2020-0056. - 2020.

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2020-10-20
11:31
Simulation and Measurement Report for the SPS BTV / Farricker, Aaron (University of Liverpool (GB)) ; Kramer, Patrick (CERN) ; Vollinger, Christine (CERN)
The SPS BTV is an integral part of the new beam dump area of the the SPS installed in LSS5 during LS2. [...]
CERN-ACC-NOTE-2020-0055. - 2020. - 7 p.
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2020-10-06
17:58
A Vlasov approach to study transverse instabilities driven by electron clouds / Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Sabato, Luca
We present a linearized method to study transverse instabilities due to electron clouds. [...]
CERN-ACC-NOTE-2020-0054. - 2020. - 22 p.
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2020-10-06
17:47
MD3310 – Complex tune shift measurement at flat-top in the LHC / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Giordano, Francesco (Universita e sezione INFN di Napoli (IT)) ; Hemelsoet, Georges-Henry (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Ribes Metidieri, Ariadna (University of Barcelona (ES)) et al.
This note summarises the MD3310 activity. [...]
CERN-ACC-NOTE-2020-0053. - 2020. - 6 p.
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2020-10-06
10:33
STUDY OF FEASIBILITY AND USEFULNESS OF MACHINE LEARNING METHODS TO HELP IDENTIFYING RESIDUAL GAS COMPOSITION / Jenninger, Berthold (CERN) ; Fernando, Mateo (IDAL)
This report summarizes the outcome of the collaboration between CERN and Intelligent Data Analysis Laboratory (IDAL) [...]
CERN-ACC-NOTE-2020-0052. - 2018. - 16 p.
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2020-09-25
11:23
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. [...]
CERN-ACC-NOTE-2020-0051. - 2020. - 13 p.
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2020-09-25
11:02
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. [...]
CERN-ACC-NOTE-2020-0050. - 2020. - 29 p.
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2020-09-25
10:47
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. [...]
CERN-ACC-NOTE-2020-0049. - 2020. - 22 p.
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2020-09-25
10:42
MD3287: Luminosity scans with waist shifts / Coello De Portugal - Martinez Vazquez, Jaime Maria ; Fol, Elena (Goethe University Frankfurt (DE)) ; 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. [...]
CERN-ACC-NOTE-2020-0048. - 2020. - 11 p.
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