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Articles by Barranco Garcia
El helicóptero desde Juan de la Cierva hasta la Patrulla Aspa
IdiomacatalàDeutschEnglishespañoleuskarafrançaisgalegoitalianoportuguêsromână
El helicóptero en el Ejército del Aire: la evolución del SAR a la recuperación de personal
IdiomacatalàDeutschEnglishespañoleuskarafrançaisgalegoitalianoportuguêsromână
Montilla. La fundición en Montilla: Una industria singular
IdiomacatalàDeutschEnglishespañoleuskarafrançaisgalegoitalianoportuguêsromână
Simulation and optimization of beam losses during continuous transfer extraction at the CERN Proton Synchrotron
Title Simulation and optimization of beam losses during continuous transfer extraction at the CERN Proton Synchrotron Author(s) Barranco García, J. (CERN) ; Gilardoni, S. (CERN) Imprint 10 p.
Assessment of Linear and Non-Linear Optics Errors due to Beam-Beam with Multipoles for the High Luminosity LHC
Title Assessment of Linear and Non-Linear Optics Errors due to Beam-Beam with Multipoles for the High Luminosity LHC Author(s) Medina Medrano, Luis (Guanajuato U. ; CERN) ; Barranco García, Javier (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Tomás, Rogelio (CERN) Imprint 4 p.
The High Energy LHC Beam-Beam Effects studies
Title The High Energy LHC Beam-Beam Effects studies Author(s) Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Amorim, David (CERN) ; Antipov, Sergey (CERN) ; Barranco García, Javier (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Rivkin, Leonid (Ecole Polytechnique, Lausanne) ; Salvant, Benoit (CERN) ; Tambasco, Claudia (Ecole Polytechnique, Lausanne) ; Zimmermann, Frank (CERN) Imprint 4 p.
High-Energy LHC Design
Author(s) Zimmermann, Frank (CERN) ; Abelleira, Jose Luis (JAI, UK) ; Amorim, David (CERN) ; Antipov, Sergey (CERN) ; Apyan, Armen (Yerevan Phys.
Landau Damping Studies for the FCC: Octupole Magnets, Electron Lens and Beam-Beam Effects
Published Articles Title Landau Damping Studies for the FCC: Octupole Magnets, Electron Lens and Beam-Beam Effects Author(s) Tambasco, Claudia (Ecole Polytechnique, Lausanne) ; Arsenyev, Sergey (CERN) ; Barranco García, Javier (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Rivkin, Leonid (Ecole Polytechnique, Lausanne) ; Schulte, Daniel (CERN) Imprint 4 p.
Status of the studies on collective effects involving beam-beam interactions at the HL-LHC
This note summarised the status of the studies on the coherent beam-beam effects in the HL-LHC project. It is shown that the obit, tune, chromaticity and dynamic β effects due to head-on and long-range beam-beam interactions are tolerable without dedicated mitigations in the baseline scenario.
MD 2722: Investigation of Landau damping by means of BTF measurements
Stability diagrams quantify the LHC stability thresholds due to the beam coupling impedance. Beam Transfer Function (BTF) measurements are a direct measurements of the stability diagram and therefore of the Landau damping of proton beams. Some coherent instabilities at the LHC are still not fully understood, especially when in the presence of beam-beam long range interactions at the end of the betatron squeeze.
MD 2197: Experimental studies of Landau damping by means of Beam Transfer Function measurements in the presence of beam-beam interactions and diffusive mechanisms
Beam Transfer Function (BTF) measurements are direct measurement of the stability diagrams that de?ne the stability threshold of coherent beam instabilities driven by the impedance. At the LHC, some coherent instabilities at ?at top energy are still not fully understood and the BTF measurements provide a method to experimentally probe the Landau damping of the proton beams.
Impact of the ADT on the beam quality with high brightness beams in collision (MD2155)
Internal Note Report number CERN-ACC-NOTE-2018-0005 Title Impact of the ADT on the beam quality with high brightness beams in collision (MD2155) Author(s) Buffat, Xavier (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Kostoglou, Sofia (National Technical Univ.
Update of the HL-LHC operational scenarios for proton operation
Author(s) Metral, Elias (CERN) ; Antipov, Sergey (CERN) ; Antoniou, Fanouria (CERN) ; Appleby, Robert Barrie (University of Manchester (GB)) ; Arduini, Gianluigi (CERN) ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Baudrenghien, Philippe (CERN) ; Biancacci, Nicolo (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Calaga, Rama (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Chapochnikova, Elena (CERN) ; Crouch,...
JACoW : New Features of the 2017 SixTrack Release
The SixTrack particle tracking code is routinely used to simulate particle trajectories in high energy circular machines like the LHC and FCC, and is deployed for massive simulation campaigns on CERN clusters and on the BOINC platform within the LHC@Home volunteering computing project. The 2017 release brings many upgrades that improve flexibility, performance, and accuracy.
JACoW : Observations of Beam Losses at the LHC During Reduction of Crossing Angle
Published Articles Title Observations of Beam Losses at the LHC During Reduction of Crossing Angle Author(s) Salvachua, Belen (CERN) ; Barranco García, Javier (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Crouch, Matthew (U. Manchester (main)) ; Gorzawski, Arkadiusz (Ecole Polytechnique, Lausanne ; CERN) ; Pieloni, Tatiana (CERN) ; Redaelli, Stefano (CERN) ; Tambasco, Claudia (CERN) ; Wenninger, Jorg (CERN) Imprint 4 p.
Limitations due to strong head-on beam-beam interactions (MD 1434)
Internal Note Report number CERN-ACC-NOTE-2017-0044 Title Limitations due to strong head-on beam-beam interactions (MD 1434) Author(s) Buffat, Xavier (CERN) ; Furuseth, Sondre Vik ; Iadarola, Giovanni (CERN) ; Papadopoulou, Parthena Stefania (University of Crete (GR)) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) ; Pojer, Mirko (CERN) ; Crockford, Guy (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Trad, Georges (CERN) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de...
Dynamic Aperture Studies for HL-LHC with beam-beam effects
Various possible operational scenarios are foreseen for the High Luminosity Large Hadron Collider (HL-LHC). In this note we summarize the study and characterization of the beam-beam effects for various possible operational scenarios for the High Luminosity Large Hadron Collider (HL-LHC).
Compensation of long-range beam-beam effects with octupole magnets: dynamic aperture simulations for the HL-LHC case and possible usage in LHC and FCC.
The Large Hadron Collider has shown with various experimental verifications that one of the main limitations to the collider performance and to a possible upgrade can come from the long-range beam-beam effects which will define the operational parameters (intensities and emittances) and machine set-up (crossing angles and the minimum beta function at the interaction points).
Long term dynamics of the high luminosity Large Hadron Collider with crab cavities
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to achieve an integrated luminosity of 200–300??fb-1 per year, including the contribution from the upgrade of the injector chain. For the HL-LHC the larger crossing angle together with a smaller beta function at the collision point would result in more than 70% luminosity loss due to the incomplete geometric overlap of colliding bunches.
MD 1856 - Landau Damping: Beam Transfer Functions and diffusion mechanisms
In the 2012, 2015 and 2016 several instabilities were developing during the betatron squeeze where beam-beam interactions become stronger modifying the tune spread provided by the octupoles magnets. Studies of the stability area computed by evaluating the dispersion integral for different tune spread couldn’t explain the 2012 observed instabilities during the squeeze.
Probing the behaviour of high brightness bunches in collision at 6.5 TeV and the interplay with an external source of noise (MD1433)
The results of an experiment aiming at colliding high brightness bunches at 6.5 TeV in the LHC and probing the interplay between external noise and head on beam-beam interaction are presented. The colliding bunches are shown to have a burn off dominated lifetime, but they experience a significant emittance growth, possibly resulting from the transverse feedback noise with non standard settings.
MD 1407 - Landau Damping: Beam Transfer Functions and diffusion mechanisms
In the 2012, 2015 and 2016 run several instabilities were developing at flat-top, during and at the end of the betatron squeeze where beam-beam interactions are present. The tune spread in the beams is therefore modified by the beam-beam long-range interactions and by other sources of spread. Studies of the stability area computed by evaluating the dispersion integral for different tune spreads couldn’t explain the observed instabilities during the squeeze and stable beams.
CERN Document Server
The international Future Circular Collider (FCC) study is designing hadron, lepton and lepton-hadron colliders based on a new 100 km tunnel in the Geneva region. The main focus and ultimate goal of the study are high luminosity proton-proton collisions at a centre-of-mass energy of 100 TeV, using 16 T Nb3Sn dipole magnets.
CERN Document Server
HL-LHC will rely on very large beam-beam head-on shift and spread. Also LHC to push for higher luminosity will go in the same direction. A clear understanding of colling high brightness beams is fundamental to guarantee the operation of such beams and to anticipate problematics linked to such configuration. We want to explore the beam dynamics of colliding beams with high brightness: intensities as high as possible close to 2e11 ppb or higher and small emittances.
CERN Document Server
Internal Note Report number CERN-ACC-NOTE-2016-0020 Title MD 400: LHC emittance growth in presence of an external source of noise during collision Author(s) Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Qiang, Ji (3Lawrence Berkeley National Laboratory) ; Trad, Georges (CERN) ; Valuch, Daniel (CERN) ; Betz, Michael (CERN) ; Wendt, Manfred (CERN) ;...
CERN Document Server
Identifying the minimum crossing angle achievable in the LHC is a key parameter to identify the collider luminosity reach. In this note, we summarise the observations collected during a dedicated experiment performed in 2015, where the strength of the long range beam-beam interaction is varied by reducing the crossing angle at IP1 and IP5. The crossing angle and the impact of the long range beam-beam interaction is analysed with respect to the beam and luminosity lifetimes.
CERN Document Server
For the first time in the LHC, Beam Transfer Function (BTF) measurements have been performed. Different machine configurations have been tested to determine the safety of the BTF measurement system that results to be completely transparent on single beam. To evaluate the spread given by different Landau octupole currents, an octupole current scan was performed. The data analysis is still ongoing.
CERN Document Server
Internal Note Report number CERN-ACC-NOTE-2015-0009 Title HL-LHC Operational ScenariosAbbreviationHigh Luminosity LHC Author(s) Arduini, Gianluigi (CERN) ; Banfi, Danilo (Ecole Polytechnique Federale de Lausanne) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Biancacci, Nicolo (CERN) ; Brüning, Oliver (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Höfle, Wolfgang (CERN) ; Li, Kevin (CERN) ; Metral, Elias (CERN) ; Esteban Muller, Juan (Ecole...
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