CERN Accelerating science

CERN Published Articles

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2019-08-22
06:55
Stability modeling of the LHC Nb-Ti Rutherford cables subjected to beam losses / Bottura, L (CERN) ; Breschi, M (Bologna U.) ; Felcini, E (CERN) ; Lechner, A (CERN)
The Large Hadron Collider (LHC) at CERN is being prepared for its full energy exploitation during run III, i.e., an increase of the beam energy beyond the present 6.5 TeV, targeting the maximum discovery potential attainable. This requires an increase of the operating field of the superconducting dipole and quadrupole magnets, which in turn will result in more demanding working conditions due to a reduction of the operating margin while the energy deposited by particle loss will increase. [...]
2019 - 10 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 041002 Fulltext from Publisher: PDF;

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2019-08-22
06:55
Noninvasive LHC transverse beam size measurement using inelastic beam-gas interactions / Alexopoulos, A (CERN) ; Barschel, C (CERN) ; Bravin, E (CERN) ; Bregliozzi, G (CERN) ; Chritin, N (CERN) ; Dehning, B (CERN) ; Ferro-Luzzi, M (CERN) ; Giovannozzi, M (CERN) ; Jacobsson, R (CERN) ; Jensen, L (CERN) et al. /BGV
The beam-gas vertex (BGV) detector is an innovative instrument measuring noninvasively the transverse beam size in the Large Hadron Collider (LHC) using reconstructed tracks from beam-gas interactions. The BGV detector was installed in 2016 as part of the R&D; for the High-Luminosity LHC project. [...]
2019 - 15 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 042801 Fulltext from Publisher: PDF;

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2019-08-22
06:55
Development of the SLRI beam test facility for characterization of monolithic active pixel sensors / Kittimanapun, K (Unlisted, TH) ; Chanlek, N (unlisted, TH) ; Klysubun, P (unlisted, TH) ; Kobdaj, C (Suranaree U. of Tech.) ; Lakrathok, A (Suranaree U. of Tech.) ; Laojamnongwong, N (Suranaree U. of Tech.) ; Mager, M (CERN) ; Musa, L (CERN)
Synchrotron Light Research Institute (SLRI) has successfully constructed a new experimental station, a Beam Test Facility (BTF), to the current SLRI accelerator complex. SLRI-BTF is capable of producing electron test beams with the number of electrons ranging from a few to millions of electrons per spill and with tunable energy from 40 MeV up to 1.2 GeV. [...]
2019 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 930 (2019) 105-111

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2019-08-22
05:13
Alternative approach to populate and study the $^{229}$Th nuclear clock isomer / Verlinde, M. (Leuven U.) ; Kraemer, S. (Leuven U.) ; Moens, J. (Leuven U.) ; Chrysalidis, K. (CERN) ; Correia, J.G. (Lisbon, IST) ; Cottenier, S. (U. Gent (main) ; Unlisted, BE) ; De Witte, H. (Leuven U.) ; Fedorov, D.V. (Kurchatov Inst., Moscow) ; Fedosseev, V.N. (CERN) ; Ferrer, R. (Leuven U.) et al.
A new approach to observe the radiative decay of the $^{229}$Th nuclear isomer, and to determine its energy and radiative lifetime, is presented. Situated at a uniquely low excitation energy, this nuclear state might be a key ingredient for the development of a nuclear clock, a nuclear laser and the search for time variations of the fundamental constants. [...]
arXiv:1904.10245.- 2019-08-12 - 10 p. - Published in : Phys. Rev. C 100 (2019) 024315 Fulltext: PDF;

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2019-08-21
06:46
Thermal shock experiment of beryllium exposed to intense high energy proton beam pulses / Ammigan, K (Fermilab) ; Bidhar, S (Fermilab) ; Hurh, P (Fermilab) ; Zwaska, R (Fermilab) ; Butcher, M (CERN) ; Calviani, M (CERN) ; Guinchard, M (CERN) ; Losito, R (CERN) ; Kuksenko, V (Oxford U.) ; Roberts, S (Oxford U.) et al.
Beryllium is a material extensively used in various particle accelerator beam lines and target facilities, as beam windows and, to a lesser extent, as secondary particle production targets. With increasing beam intensities of future multimegawatt accelerator facilities, these components will have to withstand even greater thermal and mechanical loads during operation. [...]
FERMILAB-PUB-18-670-AD.- 2019 - 14 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 044501 Fulltext: PDF; Fulltext from Publisher: PDF; External link: FERMILABPUB

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2019-08-21
06:46
Field Quality of HD3—A Nb$_3$Sn Dipole Magnet Based on Block Design / Wang, Xiaorong (LBL, Berkeley) ; Cheng, Daniel W (LBL, Berkeley) ; Dietderich, Daniel R (LBL, Berkeley) ; DiMarco, Joseph (Fermilab) ; Felice, Hélène (Saclay) ; Ferracin, Paolo (CERN) ; Marchevsky, Maxim (LBL, Berkeley) ; Prestemon, Soren O (LBL, Berkeley) ; Sabbi, Gianluca (LBL, Berkeley)
HD3 is the latest magnet of a series of block-type Nb3Sn dipole model magnets developed by the Superconducting Magnet Program at Lawrence Berkeley National Laboratory. The magnet is 1 m long with a clear aperture of 43 mm. [...]
FERMILAB-PUB-19-402-TD.- 2019 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4002507

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2019-08-21
06:46
Optimization of the CLIC positron source using a start-to-end simulation approach involving multiple simulation codes / Han, Y L (Orsay, LAL) ; Bayar, C (Ankara U.) ; Latina, A (CERN) ; Doebert, S (CERN) ; Schulte, D (CERN) ; Ma, L L (Shandong U.)
A start-to-end optimization simulation toolkit for the CLIC positron source has been developed using multiple simulation codes to model adequately different areas of the positron source. The positron source includes the targets using channeling and pair-production processes, the adiabatic matching device and the pre-injector and injector linacs. [...]
2019 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 928 (2019) 83-88

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2019-08-20
06:49
Thermally Activated ReBCO Switches for Charging High-Current Magnets / Bykovskiy, Nikolay (CERN) ; Dudarev, Alexey (CERN) ; Kate, Herman ten (CERN)
Aiming at design improvements for the International Axion Observatory, alternative options for powering of the 20-kA magnet are under consideration. Use of high-temperature super- conductors in a transformer–rectifier system cooled by a single stage cryocooler at 40 K–50 K level is a promising option, which al- lows to avoid massive movable bus bars, current leads, and related services. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 5502005 Fulltext from publisher: PDF;

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2019-08-20
06:49
Manufacture and Test of the ITER TF Type HTS Current Lead Prototypes / Ding, Kaizhong (Hefei, Inst. Plasma Phys.) ; Zhou, Tingzhi (Hefei, Inst. Plasma Phys.) ; Ballarino, Amalia (CERN) ; Gung, Chenyu (Southampton U.) ; Lu, Kun (Hefei, Inst. Plasma Phys.) ; Song, Yuntao (Hefei, Inst. Plasma Phys.) ; Niu, Erwu (Beihang U.) ; Bauer, Pierre (BIAM, St Paul lez Durance) ; Devred, Arnaud (BIAM, St Paul lez Durance) ; Lee, Seungje (BIAM, St Paul lez Durance) et al.
High temperature superconducting current leads (HTS-CL) are designed to supply the current to the large superconducting ITER magnets for the operation with reduced heat load to the cryogenic system. The Toroidal field (TF) current leads are the largest with a current capacity of 68 kA each. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4802605

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2019-08-20
06:49
How to Computationally Determine the Maximum Stable Operation Current of an HTS Magnet / Ruuskanen, Janne (Tampere U. of Tech.) ; Stenvall, Antti (Tampere U. of Tech.) ; Lahtinen, Valtteri (Tampere U. of Tech.) ; van Nugteren, Jeroen (CERN) ; Kirby, Glyn (CERN) ; Murtomäki, Jaakko (Tampere U. of Tech.)
The short-sample critical current is only an indicative property for the maximum current a magnet can be continuously operated with. This was especially visible in the experiments of one of the world's first Roebel-cable-based high temperature superconductors dipole magnet prototype built and tested at CERN in 2017 where the thermal runaway developed very slowly in many cases. [...]
2019 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4701204 fulltext from publisher: PDF;

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