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CERN Accelerating science

LHC

Letzte Einträge:
2021-04-22
12:04
Impact of betatron collimation losses in the High-Energy Large Hadron Collider / Varasteh, M (CERN) ; Bruce, R (CERN) ; Cerutti, F (CERN) ; Crouch, M (CERN) ; Zimmermann, F (CERN)
In response to recommendations in the 2013 update of the European Strategy for Particle Physics, a conceptual design effort for an energy upgrade of the Large Hadron Collider (LHC) at CERN, the so-called high-energy LHC (HE-LHC), was launched as part of the Future Circular Collider study. The HE-LHC machine, which is meant to use 16 T magnet technologies in the existing LHC tunnel, would provide proton collisions at a center-of-mass energy of 27 TeV (∼2×LHC) with a total stored energy of 1.34 GJ (∼4×LHC) per beam. [...]
2021 - 12 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 041601 Fulltext from Publisher: PDF;

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2021-04-22
12:04
Supervised learning-based reconstruction of magnet errors in circular accelerators / Fol, E (CERN ; Frankfurt U.) ; Tomás, R (Frankfurt U.) ; Franchetti, G (Frankfurt U. ; Darmstadt, GSI)
Magnetic field errors and misalignments cause optics perturbations, which can lead to machine safety issues and performance degradation. The correlation between magnetic errors and deviations of the measured optics functions from design can be used in order to build supervised learning models able to predict magnetic errors directly from a selection of measured optics observables. [...]
2021 - 19 p. - Published in : Eur. Phys. J. Plus 136 (2021) 365 Fulltext: PDF;

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2021-04-19
15:14
Particles of the Universe: an ATLAS Experiment Colouring Book in French | Les particules de l'Univers : un livre de coloriage de l'expérience ATLAS / Anthony, Katarina (Universita degli Studi di Udine (IT)) ; Velho, Mariana (Universidade Nova de Lisboa (PT))
Language: French - The ATLAS Colouring Book (Ages 4+): Explore the world of particles in this free-to-download colouring book! Meet the elementary particles that scientists have discovered – so far! – and learn about the role they play in our Universe..
ATLAS-OUTREACH-2021-030.
- 2021. - 18.
Language: Arabic

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2021-04-15
06:18
CERN Yellow Report Front Cover Radiation effects in the LHC experiments: Impact on detector performance and operation / Dawson, I (ed.)
This report documents the knowledge and experiences gained by the LHC experiments in running detector systems in radiation environments during 2010–2018, with a focus on the inner detector systems [...]
CERN-2021-001. - Geneva : CERN, 2021. - 154 p. (CERN Yellow Reports: Monographs ; 1/2021)


ebook
Fulltext - List of chapters
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2021-04-12
21:34
Criticality of fast failures in the High Luminosity Large Hadron Collider / Lindstrom, Bjorn Hans Filip
Each of the two Large Hadron Collider (LHC) beams contain 362 MJ of energy [...]
CERN-THESIS-2020-318 urn:nbn:se:uu:diva-426416 ; ISBN:978-91-513-1081-7 ; oai:DiVA.org:uu-426416 ; diva2:1504630. - Uppsala, Sweden : Acta Universitatis Upsaliensis, 2021-01-05. - 115 p.

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2021-03-26
12:11
Local beating corrections with orbit bumps in the LHC / Wolf, Dominik Werner
The purpose of this Master thesis is to explore further possibilities to increase the Luminosity of the Large Hadron Collider (LHC) by improving the optics correction [...]
CERN-THESIS-2021-024 - 104 p.

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2021-03-26
06:13
Achromatic telescopic squeezing scheme and by-products: From concept to validation / Fartoukh, S (CERN) ; Solfaroli, M (CERN) ; De Portugal, J Coello (CERN) ; Mereghetti, A (CERN) ; Poyet, A (CERN) ; Wenninger, J (CERN)
The achromatic telescopic squeezing (ATS) scheme has brought an essential conceptual foundation to the HL-LHC project, making possible a strong and clean (achromatic) reduction of β*, an important parameter with respect to which several HL-LHC sub-systems were dimensioned (e.g., the 150 mm aperture of the new inner triplet quadrupoles) or justified (crab-cavities for mitigating the geometric luminosity loss factor at low β* and subsequent large crossing-angle). The basic mechanics of the scheme is shortly reminded, highlighting as well some of its by-products (Landau damping, long-range beam-beam mitigation with octupoles), and a recent improvement which made possible an early, but still partial, implementation of ATS optics in the LHC for the 2017 and 2018 LHC physics runs. [...]
2021 - 13 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 021002 Fulltext from Publisher: PDF;

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2021-03-26
06:13
First observation of ion beam channeling in bent crystals at multi-TeV energies / Redaelli, S (CERN) ; Butcher, M (CERN) ; Barreto, C (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) ; Rossi, R (CERN ; INFN, Rome ; Rome U.) ; Scandale, W (CERN) ; Serrano Galvez, P (CERN) et al.
Planar channeling in bent crystals has been observed in LHC with multi-TeV proton beam in 2015. Two crystals, mounted on novel high-accuracy goniometers (one in the horizontal and one in the vertical plane), are integrated in the LHC collimation system, for studying the feasibility of the crystal-based collimation scheme. [...]
2021 - 7 p. - Published in : Eur. Phys. J. C 81 (2021) 142 Fulltext: PDF;

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2021-03-26
06:13
Magnetic Field Measurements of First Pre-series Full-Length 4.2 m Quadrupole MQXFA03 Using PCB Rotating Coils for the Hi-Lumi LHC Project / Song, Honghai (Stony Brook U.) ; Ambrosio, Giorgio (Fermilab) ; Amm, Kathleen (Brookhaven) ; Anerella, Michael (Brookhaven) ; Apollinari, Giorgio (Fermilab) ; Cheng, Daniel (LBNL) ; Chlachidze, Guram (Fermilab) ; DiMarco, Joseph (Fermilab) ; Feher, Sandor (Fermilab) ; Ferracin, Paolo (LBNL) et al.
The U.S. Hi-Lumi LHC Accelerator Upgrade Project (AUP) and CERN have joined efforts to develop high field quad-rupoles for the Hi-Lumi LHC upgrade. [...]
FERMILAB-PUB-21-038-TD.- 2021 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 4000207 Fulltext: PDF; External link: Fermilab Accepted Manuscript
In : Applied Superconductivity Conference, Online, 24 Oct - 7 Nov 2020, pp.4000207

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2021-03-19
06:02
Control of large helium cryogenic systems: a case study on CERN LHC / Pezzetti, Marco (CERN)
The CERN cryogenic facilities demand a versatile, distributed, homogeneous and highly reliable control system. For this purpose, CERN conceived and developed several frameworks (JCOP, UNICOS, FESA, CMW), based on current industrial technologies and COTS equipment, such as PC, PLC and SCADA systems complying with the requested constraints. [...]
2021 - 20 p. - Published in : EPJ Tech. Instrum. 8 (2021) 6 Fulltext: PDF;

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