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ATS Notes

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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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2019-07-16
17:43
Emittance growth in collision with optimised ADT settings (MD3291) / Buffat, Xavier (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Valuch, Daniel (CERN) ; Soderen, Martin (CERN) ; Komppula, Jani Paavo Olavi
A short end of fill experiment, aiming at evaluating the variation of the emittance growth rate on operational beams in collision when reducing the bandwidth of the transverse damper, is described in this note [...]
CERN-ACC-NOTE-2019-0028. - 2019. - 6 p.
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2019-07-16
17:34
Intensity dependance of the train instability threshold and high pile-up test with 12b trains (MD3294) / Buffat, Xavier (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Bartosik, Hannes (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Iadarola, Giovanni (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
As signs of electron cloud driven instabilities at top energy were observed in MDs in 2017 even with short trains(12b), an additional experiment was performed in 2018 to assess the intensity scaling of this instability mechanism using high intensity 12b trains available from the existing injector chain, i.e [...]
CERN-ACC-NOTE-2019-0027. - 2019. - 8 p.
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2019-07-16
16:26
Noise studies with new ADT pickups (MD4143) / Buffat, Xavier (CERN) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Komppula, Jani Paavo Olavi ; Kotzian, Gerd (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) et al.
An experiment aiming at characterizing the performance of a new engineering prototype for the ADT pickup readout electronics with a low noise floor from the point of view of beam stability and emittance growth in collision is described in this note [...]
CERN-ACC-NOTE-2019-0026. - 2019. - 12 p.
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2019-07-05
18:18
Experience with antiproton stacking at injection energy in CERN’s AD / Angoletta, Maria Elena (CERN) ; Belochitskii, Pavel ; Bojtar, Lajos (CERN) ; Eriksson, Tommy (CERN) ; Findlay, Alan James (CERN) ; Pedersen, Flemming
CERN’s Antiproton Decelerator (AD) started operating for physics in July 2000 and has been successfully providing experiments with antiprotons since then [...]
CERN-ACC-NOTE-2019-0025. - 2019. - 24 p.
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LHC MD Notes (131)