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2019-09-19
16:25
A VdM Sequence File Web Application / Hickman, Thomas Kendall ; Marqversen, Frederik Kofoed ; Calia, Andrea (CERN) ; Hostettler, Michi (CERN)
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
CERN-ACC-NOTE-2019-0038. - 2019.

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2019-09-19
11:31
Studies of PACMAN effects in the HL-LHC / Ribes Metidieri, Ariadna (University of Barcelona (ES)) ; Buffat, Xavier (CERN)
This note summarises the status of the studies on PACMAN beam-beam effects in the HL-LHC project. [...]
CERN-ACC-NOTE-2019-0037. - 2019. - 34 p.
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2019-08-30
15:42
LHC injection losses for tighter collimator settings in view of the HE-LHC / Crouch, Matthew Paul (CERN) ; Bartmann, Wolfgang (CERN)
In view of the smaller physical apertures of Nb3Sn magnets for the HE-LHC study, a machine study was performed in the LHC to tighten correspondingly the ring and injection protection collimators and measure the change in loss behaviour [...]
CERN-ACC-NOTE-2019-0036. - 2019. - 8 p.

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2019-08-27
11:48
WEPLATE WP8 6DOF ALIGNMENT PLATFORM / Lino Diogo Dos Santos, Miguel (CERN) ; Evrard, Sebastien (CERN) ; Fuchs, Jean-Frederic (CERN) ; Labarthe-Vacquier, Julien (CERN) ; Sanchez Galan, Francisco (CERN) ; Vieille, Alban (CERN)
In the context of the LHC (Large Hadron Collider) upgrade at CERN (European Organization for Nuclear Research) known as HL-LHC (High Luminosity LHC) which will increase the LHC luminosity (rate of collisions) by a factor of five beyond the original design value and the integrated luminosity (total collisions created) by a factor ten, WP8 (Work Package 8) proposed a new alignment platform concept for the alignment of TANB (Target Absorber Neutrals) being installed in LS2 (Long Shutdown 2) at Point 8. [...]
CERN-ACC-NOTE-2019-0035. - 2019. - 23 p.
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2019-08-08
11:08
MD 4145: Study of Landau damping with an Antidamper / Antipov, Sergey (CERN) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carideo, Emanuela (Universita del Sannio (IT)) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) ; Trad, Georges (CERN) et al.
Landau damping is an essential mechanism for ensuring the transverse beam stability in LHC and its upgrades [...]
CERN-ACC-NOTE-2019-0034. - 2019. - 17 p.
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2019-08-05
09:55
Modelling the interaction of a relativistic beam particle with an electron cloud / Iadarola, Giovanni (CERN)
We study the transverse and longitudinal forces acting on a relativistic beam particle due to the interaction with an electron cloud present in the beam pipe. [...]
CERN-ACC-NOTE-2019-0033. - 2019. - 16 p.
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2019-08-02
16:40
Mode coupling instability of colliding beams in the HL-LHC / Barraud, Laurent (Johann-Wolfgang-Goethe Univ. (DE)) ; Buffat, Xavier (CERN)
The coupling between the coherent beam-beam modes and the head-tail modes can result in strong instabilities under the effect of electromagnetic wake fields [...]
CERN-ACC-NOTE-2019-0032. - 2019. - 19 p.
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2019-07-24
15:03
Design studies of a compact superconducting RF crab cavity for future colliders using Nb/Cu technology / Papke, Kai (Lancaster University (GB)) ; Amorim Carvalho, Alexandre (CERN) ; Zanoni, Carlo ; Grudiev, Alexej (CERN)
The design of a compact crab cavity using Nb/Cu technology is presented. [...]
CERN-ACC-NOTE-2019-0031. - 2019. - 14 p.

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2019-07-19
13:59
LHC MD 3165: RF power limitations at flat bottom / Medina Medrano, Luis Eduardo (CERN) ; Argyropoulos, Theodoros (CERN) ; Baudrenghien, Philippe (CERN) ; Brunner, Olivier (CERN) ; Calaga, Rama (CERN) ; Karpov, Ivan (CERN) ; Peauger, Franck (CERN) ; Shaposhnikova, Elena (CERN) ; Timko, Helga (CERN) ; Turaj, Katarzyna (CERN)
This note describes the power measurements at flat bottom with the half-detuning beam-loading scheme in the LHC performed with the aim to provide the basis for the extrapolation of the present RF power margins for Run 3 and the High-Luminosity LHC (HL-LHC). [...]
CERN-ACC-NOTE-2019-0030. - 2019.
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2019-07-18
18:17
Implementation and benchmarking of the Furman-Pivi model for Secondary Electron Emission in the PyECLOUD simulation code / Wulff, Eric (Lund University (SE)) ; Iadarola, Giovanni (CERN)
The Furman-Pivi model for the secondary electron emission process has been implemented in the PyECLOUD simulation code and can now be used in alternative to the ECLOUD model, developed for the LHC beam screen surface at the time of the LHC design. [...]
CERN-ACC-NOTE-2019-0029. - 2019. - 30 p.
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LHC MD Notes (132)