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2021-08-31
06:02
Collider physics at the intensity and energy frontier – the HL-LHC and beyond / Meloni, F (DESY) /ATLAS Collaboration ; CMS Collaboration
The LHC results have set the stage for the discussion of future high-energy physics facilities. The Higgs boson discovery, with the need of precise measurements of its properties, and the current absence of experimental evidence for new physics open a discussion on the best ways to move forward. [...]
2020 - 8 p. - Published in : J. Phys. : Conf. Ser. 1586 (2020) 012038 Fulltext: PDF;
In : 6th Symposium on Prospects in the Physics of Discrete Symmetries, Vienna, Austria, 26 - 30 Nov 2018, pp.012038

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2021-08-20
18:05
Evaluation of the closest tune approach and its MAD-X implementation / Hoydalsvik, Eirik Jaccheri (Norwegian University of Science and Technology (NTNU) (NO)) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
The closest tune approach (ΔQmin) is a measure of the transverse coupling in an accelerator. [...]
CERN-ACC-NOTE-2021-0022. - 2021. - 15 p.
Full text

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2021-08-19
06:36
On the mechanics of MQXFB—the low-beta quadrupole for the HL-LHC / Takala, E (CERN) ; Bianchi, L (CERN) ; Lackner, F (CERN) ; Ferracin, P (LBL, Berkeley) ; Izquierdo Bermudez, S (CERN) ; Pulikowski, D (CERN)
The High Luminosity Large Hadron Collider (LHC) Project target is to reach an integrated luminosity of the LHC of 3000 fb$^{−1}$, corresponding to a factor 10 increase in collisions with respect to the current accelerator. One of the main components is the superconducting quadrupole called MQXF. [...]
2021 - 20 p. - Published in : Supercond. Sci. Technol. 34 (2021) 095002 Fulltext: PDF;

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2021-08-11
11:20
Design of High-Precision lifting system for the HL-LHC Heavy Components in the interaction region / Micolon, Frederic ; Sosin, Mateusz (CERN)
Given the high radiation level and the tight alignment tolerances, the HL-LHC interaction region components are designed to be realigned remotely using motorized supporting jacks, as human interventions in these zones must be limited to the strict minimum. A position adjustment system will allow a vertical and horizontal displacement of each jack support by at least +/- 2.5 mm with a resolution of less than 10 μm [...]
CERN-ACC-2021-0006.- Geneva : CERN, 2021 - 4 p.
In : 11th International Conference on Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation, Online, Us, Online, 26 - 29 Jul 2021, pp.MEDSI20

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2021-08-04
06:15
The Detector Control System of the Muon Forward Tracker for the ALICE Experiment at LHC / Yamakawa, Kosei (Hiroshima U.) /ALICE Collaboration
ALICE is the LHC experiment specifically devoted to the study of heavy-ion collisions. The Muon Forward Tracker (MFT) is one of the new detectors developed in the framework of the upgrade programs towards the LHC Run 3 starting from 2021. [...]
2019 - 5 p. - Published in : 10.18429/JACoW-ICALEPCS2019-MOPHA163 Fulltext: PDF;
In : 17th Biennial International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS), New York, United States, 5 - 11 Oct 2019, pp.MOPHA163

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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: 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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2021-07-30
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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