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LHC Performance Notes

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2019-02-19
11:08
Estimated LHC RF system performance reach at injection during Run III and beyond / Timko, Helga (CERN) ; Chapochnikova, Elena (CERN) ; Turaj, Katarzyna (CERN)
This note describes the performance limitations of the present LHC RF system on the injection plateau, in view of increased intensities in Run III and in the HL-LHC era. [...]
CERN-ACC-NOTE-2019-0005. - 2018.
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2018-12-20
11:24
HL-LHC impedance and related effects / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Salvant, Benoit (CERN) ; Arpaia, Pasquale (Universita e sezione INFN di Napoli (IT)) ; Barnes, Mike (CERN) ; Bonanno, Edoardo (Universita degli studi di Palermo (IT)) ; Calaga, Rama (CERN) ; Carideo, Emanuela (Universita del Sannio (IT)) ; Day, Hugo Alistair et al.
This note aims at gathering the work done by CERN and collaborators on the HL-LHC beam coupling impedance in the recent years and identifying the next steps [...]
CERN-ACC-NOTE-2018-0087. - 2018. - 93 p.
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2018-08-30
14:52
Electron cloud studies for the LHC TDI and HL-LHC TDIS / Skripka, Galina (CERN) ; Iadarola, Giovanni (CERN)
The LHC injection beam stopper (TDI) is designed to protect the machine in case of injection kicker malfunctioning. [...]
CERN-ACC-NOTE-2018-0060. - 2018.
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2018-05-31
13:49
Crab Cavity effects on transverse distribution evolution and tail cleaning in the HL-LHC / Baudrenghien, Philippe (CERN) ; Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Steeper, S (California Polytechnic State Univ. (US)) ; Tucker, D (California Polytechnic State Univ. (US)) ; Wieker, Devin (California Polytechnic State Univ. (US))
This work presents the transverse action and tune distribution evolution as a function of the Crab Cavity RF noise Power Spectral Density (PSD). [...]
CERN-ACC-NOTE-2018-0042. - 2018. - 10 p.
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2017-03-31
15:35
Effect of the total RF voltage on heavy ions at injection energy in the LHC / Schaumann, Michaela (CERN) ; Alemany Fernandez, Reyes (CERN) ; Jebramcik, Marc Andre (Johann-Wolfgang-Goethe Univ. (DE)) ; Jowett, John (CERN) ; Mertens, Tom (CERN)
Emittance growth and particle losses from intra-beam scattering (IBS) are an important source of beam losses, especially at injection energy, for the heavy ions in LHC. [...]
CERN-ACC-NOTE-2017-0020. - 2017. - 11 p.
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2017-01-17
11:18
Summary of the half-day internal review of LHC performance limitations (linked to transverse collective effects) during run II (CERN, 29/11/2016) / Metral, Elias (CERN) ; Arduini, Gianluigi (CERN) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (CERN) ; Iadarola, Giovanni (CERN) ; Li, Kevin Shing Bruce (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Romano, Annalisa (Technische Universitaet Darmstadt (DE)) ; Schenk, Michael (Ecole Polytechnique Federale de Lausanne (CH)) et al.
In this note the half-day internal review of LHC performance limitations (linked to transverse collective effects) during run II (2015-2016), which took place at CERN on 29/11/2016 (https://indico.cern.ch/event/589625/), is summarised and the next steps are discussed..
CERN-ACC-NOTE-2017-0005. - 2017. - 12 p.
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2016-02-04
14:38
Amplitude dependent closest tune approach / Tomas Garcia, Rogelio (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Franchi, Andrea ; Maclean, Ewen Hamish (CERN)
Recent observations in the LHC point to the existence of an amplitude dependent closest tune approach. However this dynamical behavior and its underlying mechanism remain unknown. [...]
CERN-ACC-NOTE-2016-0025.- Geneva : CERN, 2016 - 11 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 071003 APS Open Access article: PDF; Fulltext: PDF;

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2015-10-28
15:10
Travel Software using GPU Hardware / Szalwinski, Chris M (Bradly Hoover, School of Information and Communications Technology, Seneca College, Toronto) ; Belli, Eleonora (CERN) ; Dimov, Veliko Atanasov (CERN)
Travel is the main multi-particle tracking code being used at CERN for the beam dynamics calculations through hadron and ion linear accelerators [...]
CERN-ACC-NOTE-2015-0034. - 2015. - 14 p.
CERN-ACC-NOTE-2015-0034

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2015-09-24
16:41
Characterization of Embedded BPM Collimators / VALENTINO, Gianluca (CERN)
During LS1, 16 tertiary collimators (TCTs) and 2 secondary collimators (TCSGs) in IR6 were replaced by new embedded BPM collimators. [...]
CERN-ACC-NOTE-2015-0028. - 2015. - 0 p.
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2013-11-25
09:04
Operation and Configuration of the LHC in Run 1 / Alemany-Fernandez, R ; Bravin, E ; Drosdal, L ; Gorzawski, A ; Kain, V ; Lamont, M ; Macpherson, A ; Papotti, G ; Pojer, M ; Ponce, L et al.
Between 2010 and 2013 the LHC was operated with protons at beam energies of 3.5 and 4 TeV. [...]
CERN-ACC-NOTE-2013-0041. - 2013.
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