CERN Accelerating science

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2021-07-31
09:42
A methodology for the analysis of the three-dimensional mechanical behavior of a Nb$_3$Sn superconducting accelerator magnet during a quench / Ferradas Troitino, J (CERN ; Geneva U.) ; Bajas, H (CERN) ; Bianchi, L (CERN) ; Castaldo, B (CERN) ; Ferracin, P (LBNL, Berkeley) ; Guinchard, M (CERN) ; Izquierdo, S (CERN) ; Lorenzo, J V (Barcelona Supercomputing Ctr.) ; Mangiarotti, F (CERN) ; Perez, J C (CERN) et al.
The fast thermal and electromagnetic transients that occur in a superconducting magnet in case of a quench have the potential of generating large mechanical stresses both in the superconducting coils and in the magnet structure. While the investigation of such quench loads should generally be conducted to ensure a safe operation of the system, its importance is greatly enlarged in the case of high-field magnets based on strain sensitive superconductors. [...]
2021 - 17 p. - Published in : Supercond. Sci. Technol. 34 (2021) 084003 Fulltext: HTM;

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2021-07-31
09:42
Design and Diagnostics of High-Precision Accelerator Neutrino Beams / Charitonidis, Nikolaos (CERN) ; Longhin, Andrea (INFN, Padua ; Padua U.) ; Pari, Michelangelo (CERN ; INFN, Padua ; Padua U.) ; Parozzi, Elisabetta Giulia (CERN ; INFN, Milan Bicocca ; Milan Bicocca U.) ; Terranova, Francesco (INFN, Milan Bicocca ; Milan Bicocca U.)
Neutrino oscillation physics has entered a new precision era, which poses major challenges to the level of control and diagnostics of the neutrino beams. In this paper, we review the design of high-precision beams, their current limitations, and the latest techniques envisaged to overcome such limits. [...]
2021 - 41 p. - Published in : Appl. Sciences 11 (2021) 1644 Fulltext: PDF;

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2021-07-31
09:42
Fiber Bragg Grating Sensors as Innovative Monitoring Tool for Beam Induced RF Heating on LHC Beam Pipe / Fienga, Francesco (Naples U. ; INFN, Italy ; CERN) ; Marrazzo, Vincenzo Romano (Naples U.) ; Spedding, Sara Bennett (Naples U.) ; Szillasi, Zoltan (Debrecen, Inst. Nucl. Res. ; CERN) ; Beni, Noemi (Debrecen, Inst. Nucl. Res. ; CERN) ; Irace, Andrea (Naples U.) ; Zeuner, Wolfram (CERN) ; Ball, Austin (CERN) ; Vaccaro, Vittorio Giorgio (Naples U.) ; Salvant, Benoit (CERN) et al.
The i-pipe system is a peculiar structural health monitoring system, based on Fiber Bragg Grating technology, installed on the central beam pipe of the compact Muon solenoid (CMS) experiment at CERN. In this contribution, i-pipe temperature sensors, originally conceived as thermal compensator for the strain sensors, are employed to monitor central beam pipe thermal behavior in correlation with the parameters of the particle beam travelling inside, in order to directly measure possible Beam RF induced heating effect. [...]
2021 - 6 p. - Published in : J. Lightwave Technol. 39 (2021) 4145-4150

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2021-07-31
09:42
Numerical optimization of dc wire parameters for mitigation of the long range beam-beam interactions in High Luminosity Large Hadron Collider / Skoufaris, K (CERN ; Crete U. ; Unlisted, GR) ; Fartoukh, S (CERN) ; Papaphilippou, Y (CERN) ; Poyet, A (CERN) ; Rossi, A (CERN) ; Sterbini, G (CERN) ; Kaltchev, D (TRIUMF)
Several configurations of the High Luminosity Large Hadron Collider, whose performance at collision is mainly limited due to the strong beam-beam long-range interactions, are studied in the presence of dc wire compensators. This analysis is based on analytical and numerical calculations where the main observables are the dynamic aperture (correlated to the beam lifetime) and the frequency map analysis. [...]
2021 - 16 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 074001 Fulltext: PDF;

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2021-07-31
04:03
rf measurements and tuning of the 1-m-long 750 MHz radio-frequency quadrupole for artwork analysis / Pommerenke, Hermann W. (CERN ; U. Rostock) ; van Rienen, Ursula (U. Rostock) ; Grudiev, Alexej (CERN)
The 750 MHz PIXE-RFQ (radio-frequency quadrupole), developed and built at CERN, provides 2 MeV protons over a length of one meter for proton-induced X-ray emission analysis (PIXE) of cultural heritage artwork. In this paper, we report low-power rf measurements and tuning of the PIXE-RFQ, which have been completed mid-2020. [...]
arXiv:2011.09920.- 2021-09-21 - 11 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1011 (2021) 165564 Fulltext: PDF;

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2021-07-31
04:02
Beam Measurements and Machine Learning at the CERN Large Hadron Collider / Arpaia, P. (Naples U.) ; Azzopardi, G. (CERN) ; Blanc, F. (LPHE, Lausanne) ; Buffat, X. (CERN) ; Coyle, L. (CERN ; LPHE, Lausanne) ; Fol, E. (CERN ; Frankfurt U.) ; Giordano, F. (Naples U. ; CERN) ; Giovannozzi, M. (CERN) ; Pieloni, T. (LPHE, Lausanne) ; Prevete, R. (Naples U.) et al.
This paper presents a review of the recent Machine Learning activities carried out on beam measurements performed at the CERN Large Hadron Collider. [...]
arXiv:2107.12641.
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2021-07-30
16:59
MD2193 – Impedance Measurements of the TCSPM Prototype Collimator / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Arsenyev, Sergey ; Azzopardi, Gabriella (CERN) ; Biancacci, Nicolo (CERN) ; Bruce, Roderik (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fitterer, Miriam ; Giordano, Francesco (Universita e sezione INFN di Napoli (IT)) ; Lamas Garcia, Inigo et al.
In view of the HL–LHC project, it is planned to exchange 9 out 11 of the LHC secondary collimators in IR7, made of graphite, with low–impedance ones. [...]
CERN-ACC-NOTE-2021-0021.
- 2021. - 17 p.

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2021-07-30
16:54
MD2191 – β∗–Reach: 2017 IR7 Collimation Hierarchy Limit and Impedance / Mereghetti, Alessio ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Azzopardi, Gabriella (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Metral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Valentino, Gianluca (University of Malta (MT)) ; Valuch, Daniel (CERN)
This report summarises the results of MD2191 about the hierarchy limit of the LHC collimation system in IR7 at 6.5 TeV and its impedance. [...]
CERN-ACC-NOTE-2021-0020.
- 2021. - 19 p.

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2021-07-30
11:40
Simulation Beyond the nuSTORM Production Straight / Ibna Nazim, Omar
We extend the nuSTORM production straight simulation beyond the production straight to simulate the entire muon storage ring. [...]
CERN-STUDENTS-Note-2021-008.
- 2021.
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2021-07-28
09:00
Comparison between measured radiation levels and FLUKA simulations at CHARM and in the LHC tunnel of P1-5 within the R2E project in Run 2 / Prelipcean, Daniel
This thesis aims to benchmark the measured values of the radiation monitors employed at the European Organisation for Nuclear Research (CERN), focusing on the Large Hadron Collider (LHC), for Radiation to Electronics (R2E) applications with their simulated values using the FLUKA Monte Carlo code [...]
CERN-THESIS-2021-101 - Munich, Germany : Technical University of Munich, 2021-07-26. - 131 p.


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