CERN Accelerating science

CERN Published Articles

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2017-08-22
06:23
Track reconstruction at LHC as a collaborative data challenge use case with RAMP / Amrouche, Sabrina (Geneva U.) ; Braun, Nils (KIT, Karlsruhe) ; Calafiura, Paolo (LBL, Berkeley) ; Farrell, Steven (LBL, Berkeley) ; Gemmler, Jochen (KIT, Karlsruhe) ; Germain, Cécile (Orsay, LAL ; LRI, Paris 11) ; Gligorov, Vladimir Vava (Paris U., VI-VII) ; Golling, Tobias (Geneva U.) ; Gray, Heather (LBL, Berkeley) ; Guyon, Isabelle (LRI, Paris 11) et al.
Charged particle track reconstruction is a major component of data-processing in high-energy physics experiments such as those at the Large Hadron Collider (LHC), and is foreseen to become more and more challenging with higher collision rates. A simplified two-dimensional version of the track reconstruction problem is set up on a collaborative platform, RAMP, in order for the developers to prototype and test new ideas. [...]
2017 - 12 p. - Published in : EPJ Web Conf. 150 (2017) 00015

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2017-08-22
06:23
Performance study of a large 1  ×  1 m 2 MRPC with 1  ×  1 cm 2 readout pads / Carnesecchi, F (Enrico Fermi Ctr., Rome ; INFN, Bologna ; U. Bologna, DIFA) ; Liu, Z (World Lab., Geneva ; Gangneung-Wonju Natl. U.) ; Kim, D W (World Lab., Geneva ; Gangneung-Wonju Natl. U.) ; Rodriguez, O M (World Lab., Geneva ; Pinar del Rio U.) ; Park, W (World Lab., Geneva ; Gangneung-Wonju Natl. U.) ; Vallecorsa, S (Gangneung-Wonju Natl. U.) ; Williams, M C S (CERN ; INFN, Bologna ; U. Bologna, DIFA) ; Zichichi, A (CERN ; Enrico Fermi Ctr., Rome ; INFN, Bologna ; U. Bologna, DIFA) ; Zuyeuski, R (World Lab., Geneva ; Enrico Fermi Ctr., Rome)
A Semi-Digital Hadronic Calorimeter (SDHCAL) concept has been proposed for future leptonic collider experiments. The multigap resistive plate chamber (MRPC) is a candidate for the detector planes of this calorimeter. [...]
2017 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 871 (2017) 113-117

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2017-08-22
06:23
A process modification for CMOS monolithic active pixel sensors for enhanced depletion, timing performance and radiation tolerance / Snoeys, W (CERN) ; Aglieri Rinella, G (CERN) ; Hillemanns, H (CERN) ; Kugathasan, T (CERN) ; Mager, M (CERN) ; Musa, L (CERN) ; Riedler, P (CERN) ; Reidt, F (CERN) ; Van Hoorne, J (CERN) ; Fenigstein, A (Technion) et al.
For the upgrade of its Inner Tracking System, the ALICE experiment plans to install a new tracker fully constructed with monolithic active pixel sensors implemented in a standard 180 nm CMOS imaging sensor process, with a deep pwell allowing full CMOS within the pixel. Reverse substrate bias increases the tolerance to non-ionizing energy loss (NIEL) well beyond 10131MeVneq∕cm2 , but does not allow full depletion of the sensitive layer and hence full charge collection by drift, mandatory for more extreme radiation tolerance. [...]
2017 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 871 (2017) 90-96

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2017-08-22
06:23
Final implementation, commissioning, and performance of embedded collimator beam position monitors in the Large Hadron Collider / Valentino, Gianluca (CERN ; Malta U.) ; Baud, Guillaume (CERN) ; Bruce, Roderik (CERN) ; Gasior, Marek (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Olexa, Jakub (CERN) ; Redaelli, Stefano (CERN) ; Salvachua, Belen (CERN) ; Valloni, Alessandra (CERN) et al.
During Long Shutdown 1, 18 Large Hadron Collider (LHC) collimators were replaced with a new design, in which beam position monitor (BPM) pick-up buttons are embedded in the collimator jaws. The BPMs provide a direct measurement of the beam orbit at the collimators, and therefore can be used to align the collimators more quickly than using the standard technique which relies on feedback from beam losses. [...]
2017 - 13 p. - Published in : Phys. Rev. Accel. Beams 20 (2017) 081002 Fulltext: PDF;

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2017-08-22
06:23
rf measurements and tuning of the 750 MHz radio frequency quadrupole / Koubek, Benjamin (CERN) ; Grudiev, Alexej (CERN) ; Timmins, Marc (CERN)
In the framework of the program on medical applications a compact 750 MHz RFQ has been designed and built to be used as an injector for a hadron therapy linac. This RFQ was designed to accelerate protons to an energy of 5 MeV within only 2 m length. [...]
2017 - 12 p. - Published in : Phys. Rev. Accel. Beams 20 (2017) 080102 Fulltext: PDF;

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2017-08-22
06:23
Experimental investigation of plasma impedance in Linac4 $H^−$ source / Nishida, K (Keio U.) ; Mattei, S (CERN) ; Briefi, S (Augsburg U.) ; Butterworth, A (CERN) ; Grudiev, A (CERN) ; Haase, M (CERN) ; Jones, A (CERN) ; Paoluzzi, M M (CERN) ; Voulgarakis, G (CERN) ; Hatayama, A (Keio U.) et al.
CERN ’s new particle accelerator Linac4 is part of the upgrade of the LHC accelerator chain. Linac4 is required to deliver 160 MeV H− beam to improve the beam brightness and luminosity in the Large Hadron Collider (LHC). [...]
2017 - 9 p. - Published in : AIP Conf. Proc. 1869 (2017) 030038

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2017-08-22
06:23
Applications of the Tsallis Statistics in High Energy Collisions / Bhattacharyya, Trambak (UCT-CERN Res. Ctr.) ; Cleymans, Jean (UCT-CERN Res. Ctr.) ; Garg, Prakhar (SUNY, Stony Brook) ; Kumar, Prateek (Indian Inst. Tech., Madras) ; Mogliacci, Sylvain (UCT-CERN Res. Ctr.) ; Sahoo, Raghunath (Indian Inst. Tech., Madras) ; Tripathy, Sushanta (Indian Inst. Tech., Madras)
We analytically investigate the thermodynamic variables of a hot and dense system in the framework of the Tsallis non-extensive classical statistics in the massless and in the massive cases. In addition to that, we study the effect of Tsallis Power Law distribution on the multi-particle production in the high-energy collisions. [...]
2017 - 8 p. - Published in : J. Phys. : Conf. Ser. 878 (2017) 012016
In : Workshop on Discovery Physics at the LHC, Kruger National Park, Mpumalanga, South Africa, 5 - 9 Dec 2016, pp.012016

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2017-08-22
06:23
CERN: A global project / Voss, Rüdiger (CERN)
In the most important shift of paradigm of its membership rules in 60 years, CERN in 2010 introduced a policy of “Geographical Enlargement” which for the first time opened the door for membership of non-European States in the Organization. This short article reviews briefly the history of CERN’s membership rules, discusses the rationale behind the new policy, its relationship with the emerging global roadmap of particle physics, and gives a short overview of the status of the enlargement process..
2017 - 5 p. - Published in : J. Phys. : Conf. Ser. 878 (2017) 012001
In : Workshop on Discovery Physics at the LHC, Kruger National Park, Mpumalanga, South Africa, 5 - 9 Dec 2016, pp.012001

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2017-08-22
06:23
Improving the precision of linear optics measurements based on turn-by-turn beam position monitor data after a pulsed excitation in lepton storage rings / Malina, L (Oslo U. ; CERN) ; Coello de Portugal, J (CERN) ; Persson, T (CERN) ; Skowroński, P  K (CERN) ; Tomás, R (CERN) ; Franchi, A (ESRF, Grenoble) ; Liuzzo, S (ESRF, Grenoble)
Beam optics control is of critical importance for machine performance and protection. Nowadays, turn-by-turn (TbT) beam position monitor (BPM) data are increasingly exploited as they allow for fast and simultaneous measurement of various optics quantities. [...]
2017 - 8 p. - Published in : Phys. Rev. Accel. Beams 20 (2017) 082802 Fulltext: PDF;

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2017-08-22
06:22
New solution for the high accuracy alignment of accelerator components / Caiazza, D (CERN) ; Catalan Lasheras, N (CERN) ; Mainaud Durand, H (CERN) ; Modena, M (CERN) ; Sanz, C (CERN) ; Tshilumba, D (CERN) ; Vlachakis, V (CERN) ; Wendt, M (CERN) ; Zorzetti, S (CERN)
Several state-of-the-art metrology measurement methods have been investigated and combined for a fiducialization of accelerator components in the micrometric regime. [...]
2017. - 14 p.
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