CERN Accelerating science

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1.
Review of Accelerator Limitations and Routes to Ultimate Beams / Zimmermann, Frank (CERN) ; Aßmann, Ralph (DESY) ; Bai, Mei (Darmstadt, GSI) ; Franchetti, Giuliano (Darmstadt, GSI)
Various physical and technology-dependent limits are encountered for key performance parameters of accelerators such as high-gradient acceleration, high-field bending, beam size, beam brightness, beam intensity and luminosity. This paper will review these limits and the associated challenges. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 1397-1400 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1397-1400
2.
Machine Learning Techniques for Optics Measurements and Corrections / Fol, Elena (CERN) ; Franchetti, Giuliano (Darmstadt, GSI) ; Tomás García, Rogelio (CERN)
Recently, various efforts have presented Machine Learning (ML) as a powerful tool for solving accelerator problems. In the LHC a decision tree-based algorithm has been applied to detect erroneous beam position monitors demonstrating successful results in operation. [...]
CERN-ACC-2021-011.- 2021 - 6 p. - Published in : JACoW IPAC 2020 (2020) 61-66 Fulltext: PDF;
In : 11th International Particle Accelerator Conference, Caen, France, 10 - 15 May 2020, pp.61-66
3.
Could "Flakes" of Neutral Paramagnetic or Dipolar Molecules Explain Beam Losses in the LHC? / Franchetti, Giuliano (Darmstadt, GSI ; Frankfurt U., FIAS) ; Zimmermann, Frank (CERN)
"Flakes" of neutral water or oxygen molecules carrying an electric or magnetic dipole moment can be attracted and trapped by the electromagnetic field of the circulating LHC proton beam. The possible presence of such flakes in the vacuum system could explain beam losses and beam instabilities encountered during the 2017 and 2018 LHC runs, and the observed effect of an external magnetic field..
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4254-4257 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4254-4257
4.
New Techniques to Compute the Linear Tune / Russo, Giulia (CERN ; Frankfurt U.) ; Franchetti, Giuliano (Darmstadt, GSI) ; Giovannozzi, Massimo (CERN)
Tune determination in numerical simulations is an essential aspect of nonlinear beam dynamics studies. In particular, because it allows probing whether an initial condition is close to resonance, and it enables assessment of the stability of the orbit, i.e. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC '21 (2021) 4142-4145 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4142-4145
5.
Trapping of Neutral Molecules by the Electromagnetic Beam Field / Franchetti, Giuliano (Darmstadt, GSI) ; Zimmermann, Frank (CERN)
Neutral uncharged molecules are affected by the electromagnetic field of a charged particle beam if they carry either an electric or a magnetic dipole moment. The residual gas in an accelerator beam pipe consists of such molecules. [...]
2022 - 6 p. - Published in : JACoW IPAC 2022 (2022) 1649-1654 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1649-1654
6.
Studies on the Vertical Half-Integer Resonance in the CERN PS Booster / Prebibaj, Tirsi (CERN) ; Antoniou, Fanouria (CERN) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Franchetti, Giuliano (Darmstadt, GSI)
Following the upgrades of the LHC Injectors Upgrade Project (LIU), the Proton Synchrotron Booster (PSB) at CERN successfully delivers beams with double brightness. An important contributing factor for this was the dynamic correction of the beta-beating induced by the injection chicane, which allowed stable operation closer to the half-integer resonance. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 222-225 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.222-225
7.
Recent Development in the Mitigation of Long Term High Intensity Beam Loss / Franchetti, Giuliano (Darmstadt, GSI) ; Aumon, Sandra (Darmstadt, GSI) ; Kesting, Frederik (Darmstadt, GSI) ; Liebermann, Holger ; Omet, Carsten (Darmstadt, GSI) ; Ondreka, David (Darmstadt, GSI) ; Singh, Rahul (Darmstadt, GSI) ; Gilardoni, Simone (CERN) ; Huschauer, Alexander (CERN) ; Schmidt, Frank (CERN) et al.
In this talk it is presented the state of the art studies to mitigate the long term beam loss in the FAIR accelerator. The effect of high intensity is discussed in relation with high intensities. [...]
2015 - 4 p. - Published in : (2015) , pp. THO1LR03 Published version from JACoW: PDF; External link: JACOW
In : 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams, East-Lansing, USA, 10 - 14 Nov 2014, pp.THO1LR03
8.
Analytical and Numerical Studies on Kicked Beams in the Context of Half-Integer Studies / Franchetti, Giuliano (Darmstadt, GSI ; Goethe U., Frankfurt (main) ; Helmholtz Res. Acad. Hesse for FAIR) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Prebibaj, Tirsi (CERN)
In the context of the half-integer studies an investigation of the dynamics of the kicked beam has revealed surprising properties. The coupling of space charge with chromatic- ity in addition to usual damping/non-damping dynamics, exhibits new properties typical of a linear coupling. [...]
2024 - 6 p. - Published in : JACoW HB 2023 (2024) 188-193 Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.188-193
9.
The Extreme Beams Initiative in EuCARD-2 / Franchetti, Giuliano (Darmstadt, GSI) ; Aulenbacher, Kurt (Mainz U., Inst. Kernphys.) ; Struckmeier, Jurgen (Darmstadt, GSI) ; Zimmermann, Frank (CERN)
EuCARD-2 is an Integration Activity on accelerator R&D; co-funded within the European Union’s 7th Framework Programme. The Extreme Beams (XBEAM) network of EuCARD-2 extends, and goes beyond the scope of, the previous Networking Activities of CARE-HHH and EuCARD(-1) EuroLumi [...]
CERN-ACC-2015-316; CERN-ACC-2015-317.- 2015 - 3 p. - Published in : (2015) , pp. MOPJE073 Published version from JACoW: PDF; External link: JACOW
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.MOPJE073
10.
Application of Machine Learning to Beam Diagnostics / Fol, Elena (CERN ; Frankfurt U.) ; Coello de Portugal, Jaime Maria (PSI, Villigen) ; Franchetti, Giuliano (Darmstadt, GSI ; Frankfurt U.) ; Tomás, Rogelio (CERN)
Machine Learning (ML) techniques are widely used in science and industry to discover relevant information and make predictions from data. The application ranges from face recognition to High Energy Physics experiments. [...]
2019 - 7 p. - Published in : 10.18429/JACoW-FEL2019-WEB03
In : 39th International Free Electron Laser Conference, Hamburg, Germany, 26 - 30 Aug 2019, pp.311-317

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