CERN Accelerating science

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1.
Slow extracted spill ripple control in the CERN SPS using adaptive Bayesian optimisation / Kain, Verena (CERN) ; Effinger, Ewald (CERN) ; Follin, Fabio (CERN) ; Velotti, Francesco (CERN) ; Fraser, Matthew (CERN) ; Schenk, Michael (CERN) ; Madysa, Nico (Darmstadt, GSI) ; Arrutia Sota, Pablo Andreas (CERN)
The CERN Super Proton Synchrotron (SPS) offers slow-extracted, high-intensity proton beams at 400 GeV/c for 3 fixed targets in the CERN North Experimental Area (NA) with a spill length of about 5 seconds. Since first commissioning in the late seventies, the NA has seen a steady increase in users, many of which requiring improved spill quality control. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) TUPS55 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUPS55
2.
An improved procedure for energy matching between PS and SPS at CERN / Papotti, Giulia (CERN) ; Cettour Cave, Stephane (CERN) ; Follin, Fabio (CERN) ; Spierer, Arthur (CERN)
Energy matching between two hadron synchrotrons is the adjustment of the magnetic bending fields and beam momentum to obtain a correct transfer between the two. Conventionally, energy matching is achieved by turning off the RF system and measuring the revolution frequency of the de-bunching beam in the receiving accelerator. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) TUPA156 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPA156
3.
Beam-induced heat loads on the LHC arc beam screens with different beam and machine configurations: experiments and comparison against simulations / Iadarola, Giovanni (CERN) ; Skripka, Galina (Joint Institute for Nuclear Research (RU)) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Andujar, Oscar (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Argyropoulos, Theodoros (CERN) ; Bradu, Benjamin (CERN) ; Bartosik, Hannes (CERN) et al.
Electron cloud (e-cloud) effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. [...]
CERN-ACC-NOTE-2019-0057.
- 2019. - 50 p.
Full text
4.
An upgraded luminosity leveling procedure for the ALICE Experiment / de Cataldo, Giacinto (INFN, Bari ; CERN) ; Valentino, Gianluca (CERN ; U. Malta) ; Franco, Antonio (INFN, Bari ; CERN) ; Alemany, Reyes (CERN) ; Follin, Fabio (CERN) ; Hostettler, Michi (CERN ; U. Bern (main)) ; Wenninger, Jorg (CERN)
The Large Hadron Collider (LHC) Interface project (LHC_IF) ensures that the A Large Ion Collider Experiment (ALICE) can operate congruently and safely with the LHC in different machine configurations and beam modes. Measurements in proton–proton (pp) collisions are vital for ALICE and serve as a reference to calibrate the Pb ion–Pb ion (Pb–Pb) measurements. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 763-770
5.
Performance of the CERN Low Energy Ion Ring (LEIR) with Xenon beams / Alemany-Fernández, Reyes (CERN) ; Albright, Simon (CERN) ; Andujar, Oscar (CERN) ; Angoletta, Maria Elena (CERN) ; Axensalva, Jerome (CERN) ; Bartosik, Hannes (CERN) ; Baud, Guillaume (CERN) ; Biancacci, Nicolo (CERN) ; Bozzolan, Michele (CERN) ; Cettour Cave, Stephane (CERN) et al.
In 2017 the CERN Low Energy Ion Ring demonstrated once more the feasibility of injecting, accumulating, cooling and accelerating a new nuclei, $^{129}$Xe${39+}$. The operation of this new ion species started at the beginning of March with the start up of the xenon ion source and the Linac3. [...]
CERN-ACC-2018-144.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF020 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF020
6.
Online luminosity control and steering at the LHC / Hostettler, Michael (CERN) ; Alemany-Fernández, Reyes (CERN) ; Calia, Andrea (CERN) ; Follin, Fabio (CERN) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Gorzawski, Arkadiusz (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Hruska, Marek (CERN) ; Jacquet, Delphine (CERN) et al.
This contribution reviews the novel LHC luminosity control software stack. All luminosity-related manipulations and scans in the LHC interaction points are managed by the LHC luminosity server, which enforces concurrency correctness and transactionality. [...]
2018 - 5 p. - Published in : 10.18429/JACoW-ICALEPCS2017-TUSH201 Fulltext: PDF;
In : International Conference on Accelerator and Large Experimental Physics Control Systems, Barcelona, Spain, 8 - 13 Oct 2017, pp.TUSH201
7.
Implementation and experience with luminosity levelling with offset beam / Follin, F. (CERN) ; Jacquet, D. (CERN)
The practice of luminosity levelling with an offset beam has been used as a routine operation in the LHC since 2011. This paper will describe how it has been implemented and what has been the operational experience with the system..
arXiv:1410.3667.- 2014 - 5 p.
- Published in : (2014) , pp. 183-187 Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders, pp.183-187
8.
Online Luminosity Optimization at the LHC / Follin, F (CERN) ; Alemany-Fernandez, R (CERN) ; Jacobsson, R (CERN)
The online luminosity control of the LHC experiments consists of an automatic slow real-time feedback system controlled by a specific experiment software that communicates directly with an LHC application..
2014 External link: Published version from JaCoW
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.thppc123
9.
The LHCb Online Luminosity Monitoring and Control / Jacobsson, R (CERN) ; Alemany-Fernandez, R (CERN) ; Follin, F (CERN)
The LHCb experiment searches for New Physics by precision measurements in heavy flavour physics. The optimization of the data taking conditions relies on accurate monitoring of the instantaneous luminosity, and many physics measurements rely on accurate knowledge of the integrated luminosity. [...]
LHCb-PROC-2013-063; CERN-LHCb-PROC-2013-063.- Geneva : CERN, 2014 - 4 p. Fulltext: PDF; External link: Published version from JACoW
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.thcocb05
10.
LHCb Luminosity Monitoring and Control / Jacobsson, R (CERN) ; Alemany-Fernandez, R (CERN) ; Follin, F (CERN)
LHCb-TALK-2013-341.- Geneva : CERN, 2013 - 17 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013

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