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Articles by Coello De Portugal
CERN Document Server
Title Impact of flux jumps in future colliders Author(s) Coello de Portugal, J (CERN) ; Tomás, R (CERN) ; Fiscarelli, L (CERN) ; Gamba, D (CERN) ; Martino, M (CERN) Imprint 9 p. In: Phys. Rev. Accel.
Second Order Dispersion Measurements in LHC
Title Second-order dispersion measurement in LHC Related title Second Order Dispersion Measurements in LHC Author(s) Keintzel, Jacqueline (TU Vienna ; CERN) ; Coello De Portugal - Martinez, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Garcia-Tabares, Ana (CERN) ; Hofer, Michael (CERN ; TU Vienna) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Tomás, Rogelio (CERN) ; Wegscheider, Andreas (CERN) Imprint 4 p.
CERN Document Server
Title Unsupervised machine learning for detection of faulty beam position monitors Author(s) Fol, Elena (CERN ; Goethe U., Frankfurt (main)) ; Coello de Portugal, Jaime Maria (CERN) ; Tomás, Rogelio (CERN) Imprint 4 p.
Optics corrections using machine learning in the LHC
Title Optics corrections using machine learning in the LHC Author(s) Fol, Elena (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Franchetti, Giuliano (Darmstadt, GSI ; Goethe U., Frankfurt (main)) ; Tomás, Rogelio (CERN) Imprint 4 p.
CERN Document Server
Title New approach to LHC optics commissioning for the nonlinear era Author(s) Maclean, E H (CERN ; Malta U.) ; Tomás, R (CERN) ; Carlier, F S (CERN) ; Camillocci, M S (CERN) ; Dilly, J W (CERN) ; Coello de Portugal, J (CERN) ; Fol, E (CERN) ; Fuchsberger, K (CERN) ; Garcia-Tabares Valdivieso, A (CERN) ; Giovannozzi, M (CERN) ; Hofer, M (CERN) ; Malina, L (CERN) ; Persson, T H B (CERN) ; Skowronski, P K (CERN) ; Wegscheider, A (CERN) Imprint 21 p. In: Phys. Rev. Accel.
Performance Optimisation of Turn-by-Turn Beam Position Monitor Data Harmonic Analysis
Title Performance Optimisation of Turn-by-Turn Beam Position Monitor Data Harmonic Analysis Author(s) Malina, Lukas (CERN ; U. Oslo (main)) ; Coello de Portugal, Jaime Maria (CERN) ; Dilly, Joschua (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN) ; Toplis, Matthew (CERN) Imprint 4 p.
CERN Document Server
Title Optics Measurements in Storage Rings Based on Simultaneous 3-Dimensional Beam Excitation Author(s) Malina, Lukas (CERN ; U. Oslo (main)) ; Coello de Portugal, Jaime Maria (CERN) Imprint 4 p. In: 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF046 DOI 10.18429/JACoW-IPAC2018-THPAF046 Subject category Accelerators and Storage Rings Abstract Optics measurements in storage rings usually employ excitation in both transverse directions.
Machine Learning Methods for Optics Measurements and Corrections at LHC
Title Machine Learning Methods for Optics Measurements and Corrections at LHC Author(s) Fol, Elena (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Tomás, Rogelio (CERN) Imprint 4 p.
Update of beam dynamics requirements for HL-LHC electrical circuits
Report number CERN-ACC-2019-0030 Title Update of beam dynamics requirements for HL-LHC electrical circuits Download Embed Viewed by 3 users Author(s) Gamba, Davide (CERN) ; Arduini, Gianluigi (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Martino, Michele (CERN) ; Tomas Garcia, Rogelio (CERN) Imprint 06 Feb 2019. - mult. p.
Update of beam dynamics requirements for HL-LHC electrical circuits
Report number CERN-ACC-NOTE-2019-0002 Title Update of beam dynamics requirements for HL-LHC electrical circuits Download Embed Viewed by 9 users Author(s) Gamba, Davide (CERN) ; Arduini, Gianluigi (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Martino, Michele (CERN) ; Tomas Garcia, Rogelio (CERN) Corporate author(s) CERN. Geneva.
Transverse Coupling Measurements With High Intensity Beams Using Driven Oscillations
Title Transverse Coupling Measurements With High Intensity Beams Using Driven Oscillations Author(s) Persson, Tobias (CERN) ; Baud, Guillaume (CERN) ; Buffat, Xavier (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Fol, Elena (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gąsior, Marek (CERN) ; Giovannozzi, Massimo (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Hostettler, Michael (CERN) ; Hruska, Marek (CERN) ; Jacquet, Delphine (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas...
MD 2563: Optics measurement and corrections with half integer tune
Internal Note Report number CERN-ACC-NOTE-2018-0055 Title MD 2563: Optics measurement and corrections with half integer tune Author(s) Wegscheider, Andreas (Hamburg University (DE)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Fartoukh, Stephane (CERN) ; Fol, Elena (Johann-Wolfgang-Goethe Univ.
MD2148: Flat optics
This note reports on the first attempt to measure and correct optics errors at β∗=60/30 cm and β∗=60/15 cm flat optics. In the absence of the Beam 2 vertical AC dipole, the ADT was used in AC-dipole mode to verify local corrections in IR1. A peak β-beating of 24% remained after global corrections in the horizontal plane of arc 45 of Beam 1. β∗ measurements with K-modulation showed a peak β∗-beating of 16% or larger, as IP1 measurement could not be completed.
LHC MD2877: Beam-beam long range impact on coupling measurements
The LHC is now operating with a tune separation of ?0.004 in collision. This puts tight constraints on the allowed transverse coupling since a |C?| larger than a fraction of the fractional tune split may lead to beam instabilities. In the last years a new tool based on the ADT used in a similar way as an AC-dipole to excite the beam was developed. The ADT AC-dipole gives coherent oscillations without increasing the beam emittance.
Beam dynamics requirements for HL–LHC electrical circuits
A certain number of LHC magnets and relative electrical circuits will be replaced for the HL-LHC upgrade. The performance of the new circuits will need to be compatible with the current installation, and to provide the necessary improvements to meet the tight requirements of the new operational scenario.
JACoW : Cross-Calibration of the LHC Transverse Beam-Profile Monitors
Calibration of a transverse beam profile monitor is of fundamental importance to guarantee the best possible accuracy and reliability of the instrument over time. In LHC the calibration standard for transverse-profile measurements are the wire scanners. Other profile monitors such as beam synchrotron light telescopes and interferometers are calibrated with respect to them.
APS : Improving the precision of linear optics measurements based on turn-by-turn beam position monitor data after a pulsed excitation in lepton storage rings
Beam optics control is of critical importance for machine performance and protection. Nowadays, turn-by-turn (TbT) beam position monitor (BPM) data are increasingly exploited as they allow for fast and simultaneous measurement of various optics quantities. Nevertheless, so far the best documented uncertainty of measured ?-functions is of about 10‰ rms.
Linear coupling dependence on intensity and a next step towards a feedback (MD1850)
Transverse coupling has proven to be an important variable to control beam dynamics and performance in the LHC. In this report, we present the first measurement of transverse coupling vs beam intensity. The analysis shows no dependency within the experimental uncertainties. This study was made possible with the new implementation of an AC-dipole-like excitation using the ADT. It provides the functionality to excite a single bunch in a train.
LHC MD 1988: Automatic coupling correction test
This paper reports on the tests of new software development for automatic coupling correction and automatic model generation for data acquisition extending functionality of the Multiturn application.
CERN Document Server
Internal Note Report number CERN-ACC-NOTE-2016-0008 Title MD Test of a Ballistic Optics Author(s) Garcia-Tabares Valdivieso, Ana (Ministere des affaires etrangeres et europeennes (FR)) ; Malina, Lukas (University of Oslo (NO)) ; Salvachua Ferrando, Belen Maria (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Tomas Garcia, Rogelio (CERN) ; Wenninger, Jorg (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Ministere des affaires etrangeres et...
CERN Document Server
Internal Note Report number CERN-ACC-NOTE-2015-0033 Title Towards automatic coupling corrections with DOROS BPMs (MD750) Author(s) Persson, Tobias Hakan Bjorn (CERN) ; Gasior, Marek (CERN) ; Langner, Andy Sven (Hamburg University (DE)) ; Lefevre, Thibaut (CERN) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas (University of Oslo (NO)) ; Olexa, Jakub (Slovak Technical University (SK)) ; Skowronski, Piotr Krzysztof (CERN) ; Robotka, Tomas (CERN) ; Garcia-Tabares Valdivieso, Ana (Ministere des...
CERN Document Server
The dynamic aperture of an accelerator is determined by its non-linear components and errors. Control of the dynamic aperture is important for a good understanding and operation of the accelerator. The AC dipole, installed in the LHC for the diagnostic of linear and non-linear optics, could serve as a tool for the determination of the dynamic aperture. However, since the AC dipole itself modifies the non-linear dynamics, the dynamic aperture with and without AC dipole are expected to differ.
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