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CERN Document Server 44 records found  1 - 10nextend  jump to record: Search took 0.68 seconds. 
1.
Status of the LHC emittance diagnostics / Trad, G (CERN) ; Alexopoulos, A (CERN) ; Baud, G (CERN) ; Bravin, E (CERN) ; Roncarolo, F (CERN) ; Vlachos, S (CERN) ; Wurkner, B (CERN)
Measuring the beam transverse emittance is fundamental in every accelerator, in particular for the LHC, where its precise determination and preservation is essential to maximize the luminosity and thus the performance of the colliding beams. In this contribution, a review of the status of the synchrotron radiation monitors, the beam gas vertex detector and the wirescanners will be presented alongside the assessment of the obtained performance [...]
2019 - 5 p. - Published in : (2019) , pp. 147-151 Fulltext: PDF;
In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.147-151
2.
Diamond Detector Technology: Status and Perspectives / RD42 Collaboration
The radiation tolerance of chemical vapor deposition (CVD) diamond against different particle species and energies has been studied in beam tests and is presented. We also present beam test results on signal size as a function of incident particle rate in charged particle detectors based on un-irradiated and irradiated poly-crystalline CVD diamond over a range of particle fluxes from 2 kHz/cm$^2$ to 20 MHz/cm$^2$. [...]
2018 - 5 p. - Published in : RAD Association Journal 3 (2018) 123-127 Fulltext: PDF;
In : 6th International Conference on Radiation and Applications in Various Fields of Research (RAD 2018), Orhid, North Macedonia, 18 - 22 June 2018, pp.123-127
3.
LHC Emittance Measurements in Run 2 / Trad, G (CERN) ; Alexopoulos, A (CERN) ; Bravin, E (CERN) ; Butti, D (CERN) ; Kieffer, R (CERN) ; Roncarolo, F (CERN) ; Vlachos, S (CERN) ; Wurkner, B (CERN)
Measuring the beam transverse emittance is fundamental in every accelerator, in particular for the LHC, where its precise determination and its preservation is essential to maximize the luminosity and thus the performance of the colliding beams. In this contribution, a review of the status of the wirescanners, the synchrotron radiation monitors, the beam gas vertex detector and the quadrupolar moment measurement from the beam position monitors will be presented alongside the assessment of the obtained performance. [...]
Geneva, Switzerland : , 2019 - 7 p. - Published in : , pp. 117-123 Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.117-123
4.
A Study of the Radiation Tolerance of CVD Diamond to 70 MeV Protons, Fast Neutrons and 200 MeV Pions / RD42 Collaboration
We measured the radiation tolerance of commercially available diamonds grown by the Chemical Vapor Deposition process by measuring the charge created by a 120 GeV hadron beam in a 50 μm pitch strip detector fabricated on each diamond sample before and after irradiation. We irradiated one group of samples with 70 MeV protons, a second group of samples with fast reactor neutrons (defined as energy greater than 0.1 MeV), and a third group of samples with 200 MeV pions, in steps, to (8.8±0.9) × 1015 protons/cm2, (1.43±0.14) × 1016 neutrons/cm2, and (6.5±1.4) × 1014 pions/cm2, respectively. [...]
2020 - 19 p. - Published in : Sensors 20 (2020) 6648 Fulltext: PDF;
5.
Recent progress in CVD diamond detector R&D / RD42 Collaboration
We present an overview of the latest developments from RD42 in diamond detector R&D.; They include the radiation hardness coefficients for 800MeV and 24 GeV protons, the hit detectionefficiency for two 3D detector prototypes with two different readout chips and a novel method for investigating charge transport in single crystal diamonds..
SISSA, 2020 - 11 p. - Published in : PoS Vertex2019 (2020) 029 Fulltext from Publisher: PDF;
In : Vertex 2019: 28th International Workshop on Vertex Detectors, Lopud Island, Croatia, 13 - 18 Oct 2019, pp.029
6.
Results on radiation tolerance of diamond detectors / Venturi, N (CERN) ; Alexopoulos, A (CERN) ; Artuso, M (Syracuse U.) ; Bachmair, F (ETH, Zurich (main)) ; Bäni, L (ETH, Zurich (main)) ; Bartosik, M (CERN) ; Beacham, J (Ohio State U.) ; Beck, H (Gottingen U.) ; Bellini, V (Catania U. ; INFN, Catania) ; Belyaev, V (Moscow Phys. Eng. Inst.) et al.
In sight of the luminosity increase of the High Luminosity-LHC (HL-LHC), most experiments at the CERN Large Hadron Collider (LHC) are planning upgrades for their innermost layers in the next 5–10 years. These upgrades will require more radiation tolerant technologies than exist today. [...]
2019 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 924 (2019) 241-244
In : 11th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors (HSTD11) in conjunction with 2nd Workshop on SOI Pixel Detectors (SOIPIX2017) at OIST, Okinawa, Japan, Okinawa, Japan, 10 - 15 Dec 2017, pp.241-244
7.
New test beam results of 3D and pad detectors constructed with poly-crystalline CVD diamond / Reichmann, M (ETH, Zurich (main)) ; Alexopoulos, A (CERN) ; Artuso, M (Syracuse U.) ; Bachmair, F (ETH, Zurich (main)) ; Bäni, L (ETH, Zurich (main)) ; Bartosik, M (CERN) ; Beacham, J (Ohio State U.) ; Beck, H (Gottingen U.) ; Bellini, V (Catania U. ; INFN, Catania) ; Belyaev, V (Moscow Phys. Eng. Inst.) et al.
Chemical Vapour Deposition (CVD) diamond is being considered as a material for particle detectors in a harsh radiation environment. This article presents beam test results of 3D pixel detectors fabricated with poly-crystalline CVD diamonds. [...]
Elsevier, 2020 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 958 (2020) 162675
In : 15th Vienna Conference on Instrumentation, Vienna, Austria, 18 - 22 Feb 2019, pp.162675
8.
Beam Test Results of 3D Pixel Detectors Constructed With poly-crystalline CVD diamonds / Reichmann, M (ETH, Zurich (main)) ; Alexopoulos, A (CERN) ; Artuso, M (Syracuse U. (main)) ; Bachmair, F (ETH, Zurich (main)) ; Bäni, L (ETH, Zurich (main)) ; Bartosik, M (CERN) ; Beck, H (Gottingen U.) ; Bellini, V (INFN, Catania) ; Belyaev, V (Moscow Phys. Eng. Inst.) ; Bentele, B (Colorado U.) et al. /Rd42
As a possible candidate for extremely radiation tolerant tracking devices we present a novel detector design - namely 3D detectors - based on poly-crystalline CVD diamond sensors with a pixel readout. The fabrication of recent 3D detectors as well their results in recent beam tests are presented. [...]
SISSA, 2019 - 6 p. - Published in : PoS LeptonPhoton2019 (2019) 080 Published fulltext: PDF;
In : XXIX International Symposium on Lepton Photon Interactions at High Energies, Toronto, Canada, 5 - 10 Aug 2019, pp.080
9.
Latest Results on the Radiation Tolerance of Diamond Detectors / Bäni, L (ETH, Zurich (main)) ; Alexopoulos, A (CERN) ; Artuso, M (Syracuse U. (main)) ; Bachmair, F (ETH, Zurich (main)) ; Bartosik, M (CERN) ; Beck, H (Gottingen U.) ; Bellini, V (INFN, Catania) ; Belyaev, V (Moscow Phys. Eng. Inst.) ; Bentele, B (Colorado U.) ; Bes, A (LPSC, Grenoble) et al. /Rd42
We have measured the radiation tolerance of chemical vapor deposition (CVD) diamond against protons and neutrons. The relative radiation damage constant of 24 GeV protons, 800 MeV protons, 70 MeV protons, and fast reactor neutrons is presented. [...]
SISSA, 2019 - 5 p. - Published in : PoS LeptonPhoton2019 (2019) 079 External link: Fulltext
In : XXIX International Symposium on Lepton Photon Interactions at High Energies, Toronto, Canada, 5 - 10 Aug 2019, pp.079
10.
Dialogue and materiality/embodiment in science|arts creative pedagogy: Their role and manifestation / K Chappell (U. Exeter) ; L Hetherington (U. Exeter) ; RuckKeene, H (U. Exeter) ; H Wren (U. Exeter) ; A Alexopoulos (CERN) ; O Ben-Horin (HVL, Norway) ; K Nikolopoulos (Birmingham U.) ; J Robberstad (HVL, Norway) ; S Sotiriou (Unlisted, GR) ; F X Bogner (Bayreuth U.)
This paper responds to recent calls to explore the nuances of the interaction between the sciences, the arts and their inherent creativity to better understand their potential within teaching and learning. Building on previous arguments that the science-arts-creativity relationship is dialogic and relational, this research focuses on the question: How are dialogue and material/embodied activity manifested within creative pedagogy? We begin with a fusion of Bakhtinian-inspired and New-Materialist understandings of dialogue drawing out the importance of embodiment in order to revitalize how we articulate dialogue within creative educational practice. [...]
2019 - 27 p. - Published in : Thinking Skills and Creativity 31 (2019) 296-322 Fulltext: PDF;

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2 Alexopoulos, A.
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16 Alexopoulos, Angelos
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