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LHC Performance Notes

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2019-11-12
16:55
Measurement and Simulation of the Longitudinal Impedance of the LHCb VELO / Popovic, Branko Kosta (CERN) ; Vollinger, Christine (CERN)
Impedance analysis of any new or redesigned components of the LHC machine is vital in ensuring beam stability and for inclusion in the overall impedance budget. [...]
CERN-ACC-NOTE-2019-0048. - 2019. - 8 p.

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2019-10-08
12:00
Report on the Prompt Dose Distribution Along the LHC Based on BLM Data for proton-proton operation in Run 2 / Bilko, Kacper (CERN) ; Stein, Oliver
In this report dose levels and the distributions of the prompt total ionising dose along the LHC for the proton-proton operation are presented for Run 2, covering the accelerator operation periods in 2015, 2016, 2017 and 2018. [...]
CERN-ACC-NOTE-2019-0040. - 2019. - 126 p.
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2019-03-20
21:11
Operation and Configuration of the LHC in Run 2 / Wenninger, Jorg (CERN)
Between 2015 and 2018 the LHC was operated with protons at beam energies of 6.5 TeV with an integrated production of 160 fb-1 both ATLAS and CMS in proton operation. [...]
CERN-ACC-NOTE-2019-0007. - 2019.
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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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