CERN Accelerating science

LHC

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2017-02-15
09:50
Coupled-bunch instabilities due to fundamental cavity impedance / Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Baudrenghien, Philippe (CERN) ; Chapochnikova, Elena (CERN) ; Esteban Muller, Juan (CERN) ; Molendijk, John (CERN) ; Timko, Helga (CERN)
The purpose of this MD was to estimate the stability threshold due to longitudinal coupled-bunch instabilities (CBIs) driven by the RF cavities' fundamental impedance. [...]
CERN-ACC-NOTE-2017-0009.
- 2017.
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2017-02-15
09:42
Hadron collective effects studies for the LHC and FCC-hh project / Amorim, David
High intensity particle beams circulating in accelerators can be perturbed by the electromagnetic field created by the beam itself and the interaction with the surrounding environment [...]
CERN-THESIS-2016-258 - 39 p.

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2017-01-27
16:24
Le livre de coloriage de l’expérience ATLAS /ATLAS Collaboration
Version Française - The ATLAS Experiment Colouring Book is a free-to-download educational book, ideal for kids aged 5-9. It aims to introduce children to the field of High-Energy Physics, as well as the work being carried out by the ATLAS Collaboration..
ATLAS-OUTREACH-2017-001.- Geneva : CERN, 2017 - 16. Fulltext: Format Livret - PDF; ATLAS-OUTREACH-2017-001 - PDF;

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2017-01-19
18:14
ATS MD’s in 2016 / Fartoukh, Stephane (CERN) ; Albert, Markus (CERN) ; Le Borgne, Yannick (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Garcia-Tabares Valdivieso, Ana (Ministere des affaires etrangeres et europeennes (FR)) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) et al.
This report presents a summary of the Achromatic Telescopic Squeezing (ATS) scheme related activities which took place in 2016, where a new generation of ATS pre-squeezed and telescopic optics was successfully probed, namely: (i) down to a beta* of 10 cm with pilot bunches, and (ii) with more emphasis at intermediate beta* values of 40 cm or 33 cm where collisions were established with nominal bunches, the triplet aperture was measured and collimation measurements with pre-squeezed or moderately telescopic ATS optics were conducted..
CERN-ACC-2017-0003.
- 2016. - 25 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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2017-01-17
09:11
Preliminary Design Study of the Hollow Electron Lens for LHC / Perini, Diego (CERN) ; Zanoni, Carlo (CERN)
A Hollow Electron Lens (HEL) has been proposed in order to improve performance of halo control and collimation in the Large Hadron Collider in view of its High Luminosity upgrade (HL-LHC). [...]
CERN-ACC-NOTE-2017-0004.
- 2017. - 24 p.
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2017-01-16
16:04
MD 1266: Injection of "high performance reach" 80b 25 ns beam / Bartmann, Wolfgang (CERN) ; Fraser, Matthew Alexander (CERN) ; Iadarola, Giovanni (CERN) ; Kain, Verena (CERN) ; Velotti, Francesco Maria (CERN) ; Muller, Jeremy Alfred
This note summarises the measurements and observations performed during the LHC Machine Development concerning the injection of batches of 80 bunches for future “high performance reach” of the LHC [...]
CERN-ACC-NOTE-2017-0003.
- 2017. - 9 p.
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2017-01-16
15:58
MD 1242: Injection and emittance preservation / Bartosik, Hannes (CERN) ; Bravin, Enrico (CERN) ; Iadarola, Giovanni (CERN) ; Kain, Verena (CERN) ; Trad, Georges (CERN) ; Velotti, Francesco Maria (CERN)
This note summarises the measurements and observations performed during the LHC Machine Development concerning the injection and emittance preservation studies with BCMS beam [...]
CERN-ACC-NOTE-2017-0002.
- 2017. - 9 p.
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2017-01-12
15:44
Heavy-Ion Collimation at the Large Hadron Collider : Simulations and Measurements / Hermes, Pascal Dominik
The CERN Large Hadron Collider (LHC) stores and collides proton and $^{208}$Pb$^{82+}$ beams of unprecedented energy and intensity [...]
CERN-THESIS-2016-230 - 269 p.

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2016-12-21
06:20
Measured and simulated heavy-ion beam loss patterns at the CERN Large Hadron Collider / Hermes, P D (CERN ; Munster U.) ; Bruce, R (CERN) ; Jowett, J M (CERN) ; Redaelli, S (CERN) ; Salvachua Ferrando, B (CERN) ; Valentino, G (CERN) ; Wollmann, D (CERN)
The Large Hadron Collider (LHC) at CERN pushes forward to new regimes in terms of beam energy and intensity. In view of the combination of very energetic and intense beams together with sensitive machine components, in particular the superconducting magnets, the LHC is equipped with a collimation system to provide protection and intercept uncontrolled beam losses. [...]
2016 - 11 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 819 (2016) 73-83 Elsevier Open Access article: PDF;

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