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CERN Accelerating science

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Accelerator Physics

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2021-04-13
06:01
Effective Target Speed-Reduction Techniques for Industrial Interferometers / Butcher, Mark (CERN) ; Grec, Lucian-Mircea (CERN) ; di Castro, Mario (CERN) ; Masi, Alessandro (CERN)
In recent years the cost, size and complexity of use of interferometers have reduced to an extent where they are now more employable in industrial applications, where their high precision and contactless measurement benefits are needed. [...]
Oct.. - 6 p.

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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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2021-04-07
15:36
Sextupole scheme optimization for HL–LHC / Plassard, Fabien ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN)
One essential upgrade of the High Luminosity LHC (HL–LHC) to reach the desired luminosity, is the large reduction of the β-function value at the interaction points (IP) hosting the high-luminosity experiments ATLAS and CMS. [...]
CERN-ACC-NOTE-2021-0012. - 2021.

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2021-04-06
04:00
Proof of Concept of High-Temperature Superconducting Screens for Magnetic Field-Error Cancellation in Accelerator Magnets / Bortot, L. (CERN ; Darmstadt, Tech. U.) ; Mentink, M. (CERN) ; Petrone, C. (CERN) ; Van Nugteren, J. (CERN) ; Deferne, G. (CERN) ; Koettig, T. (CERN) ; Kirby, G. (CERN) ; Pentella, M. (CERN ; Turin Polytechnic) ; Perez, J.C. (CERN) ; Pincot, F.O. (CERN) et al.
Accelerators magnets must have minimal magnetic field imperfections for reducing particle-beam instabilities. [...]
arXiv:2103.14354. - 11 p.
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2021-03-31
06:26
Multifunctional radar system for remote control of environment and the Earth’s surface / Fadeenko, V B (St. Petersburg State U. ; GRANIT, St. Petersburg) ; Fadeenko, I V (St. Petersburg State U. ; GRANIT, St. Petersburg) ; Vasiliev, D A (GRANIT, St. Petersburg) ; Davydov, V V (St. Petersburg State U.) ; Yu Rud, V (Ioffe Phys. Tech. Inst.)
The radar method for remote detection at large distances of radiation pollution in the atmosphere and on the Earth’s surface is considered. The design of radar for determine of radioactive formations in the atmosphere and near the Earth surface is developed. [...]
2021 - 7 p. - Published in : J. Phys. : Conf. Ser. 1745 (2021) 012023 Fulltext: PDF;

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2021-03-31
06:26
Fiber optic quench detection for large-scale HTS magnets demonstrated on VIPER cable during high-fidelity testing at the SULTAN facility / Salazar, Erica E (MIT, Cambridge, CTP) ; Badcock, Rodney A (Victoria U., Wellington) ; Bajko, Marta (CERN) ; Castaldo, Bernardo (CERN) ; Davies, Mike (Victoria U., Wellington) ; Estrada, Jose (MIT, Cambridge, CTP) ; Fry, Vincent (MIT, Cambridge, CTP) ; Gonzales, Jofferson T (Victoria U., Wellington) ; Michael, Philip C (MIT, Cambridge, CTP) ; Segal, Michael (Unlisted, US, MA) et al.
Fiber-optic thermometry has the potential to provide rapid and reliable quench detection for emerging large-scale, high-field superconducting magnets fabricated with high-temperature-superconductor (HTS) cables. Developing non-voltage-based quench detection schemes, such as fiber Bragg grating (FBG) technology, are particularly important for applications such as magnetic fusion devices where a high degree of induced electromagnetic noise impose significant challenges on traditional voltage-based quench detection methods. [...]
2021 - 18 p. - Published in : Supercond. Sci. Technol. 34 (2021) 035027

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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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2021-03-25
06:20
Accurate Modeling of Monotron Oscillations in Small- and Large-Signal Regimes / Cai, Jinchi (Lancaster U. (main)) ; Syratchev, Igor (CERN) ; Burt, Graeme (Lancaster U. (main))
In Klystron amplifiers, monotron oscillations may cause unacceptable beam instabilities. [...]
2020. - 7 p.

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2021-03-25
06:20
Design Study of a High-Power Ka-Band High-Order-Mode Multibeam Klystron / Cai, J C (Lancaster U. (main)) ; Syratchev, I (CERN) ; Burt, G (Lancaster U. (main))
Compactness and cost-effectiveness are two major concerns in the development of a Ka-band linearizer, which is a crucial accelerator component of the European CompactLight project. [...]
2020. - 7 p.

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