CERN Accelerating science

CERN Published Articles

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GOSSIPO-4: Evaluation of a Novel PLL-Based TDC-Technique for the Readout of GridPix-Detectors / Brezina, C (UBONN) ; Fu, Y (UBONN) ; Zappon, F (NIKHEF) ; Vn Beuzekom, M (NIKHEF) ; Campbell, M (CERN) ; Desch, K (UBONN) ; Van der Graaf, H (NIKHEF) ; Gromov, V (NIKHEF) ; Kluit, R (NIKHEF) ; Llopart, X (CERN) et al.
The direct readout of Micro-Pattern Gaseous Detectors (MPGDs) with bare pixel chips introduces the need for a new generation of readout electronics featuring a high spatial granularity as well as a highly accurate time measurement in each pixel. GOSSIPO-4, fabricated in a 130 nm CMOS technology, is a demonstrator ASIC investigating the potential of a new TDC-concept that is based on a chip-wide 40 MHz clock which is complemented by an additional 640 MHz clock. [...]
AIDA-PUB-2015-010.- Geneva : CERN, 2015 - Published in : IEEE Transactions on Nuclear Science: 61, no. 2 Fulltext: PDF;

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The RD53 Collaboration's SystemVerilog-UVM Simulation Framework and its General Applicability to Design of Advanced Pixel Readout Chips / Marconi, S (CERN, UNIPG, INFN) ; Conti, E (UNIPG, INFN) ; Placidi, P (UNIPG, INFN) ; Christiansen, J (CERN) ; Hemperek, T (UBONN)
The foreseen Phase 2 pixel upgrades at the LHC have very challenging requirements for the design of hybrid pixel readout chips. A versatile pixel simulation platform is as an essential development tool for the design, verification and optimization of both the system architecture and the pixel chip building blocks (Intellectual Properties, IPs). [...]
AIDA-PUB-2014-019.- Geneva : CERN, 2014 - Published in : JINST: 9 (2014) , no. P10005 Fulltext: PDF;

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Experience on 3D Silicon Sensors for ATLAS IBL / Darbo, G (INFN)
3D silicon sensors, where plasma micro-machining is used to etch deep narrow apertures in the silicon substrate to form electrodes of PIN junctions, represent possible solutions for inner pixel layers of the tracking detectors in high energy physics experiments. This type of sensors has been developed for the Insertable B-Layer (IBL), an additional pixel layer that has been installed in ATLAS during the present shutdown of the LHC collider at CERN. [...]
AIDA-PUB-2015-001.- Geneva : CERN, 2015 - Published in : JINST Fulltext: PDF;

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Elastic anisotropy in multifilament Nb3Sn superconducting wires / Scheuerlein, C ; Fedelich, B ; Alknes, P ; Arnau, G ; Bjoerstad, R ; Bordini, B
The elastic anisotropy caused by the texture in the Nb3Sn filaments of PIT and RRP wires has been calculated by averaging the estimates of Voigt and Reuss, using published Nb3Sn single crystal elastic constants and the Nb3Sn grain orientation distribution determined in both wire types by Electron Backscatter Diffraction. At ambient temperature the calculated Nb3Sn E-moduli in axial direction in the PIT and the RRP wire are 130 GPa and 140 GPa, respectively. [...]
CERN-ACC-2015-0022.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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Targets for R&D on Nb3Sn conductor for High Energy Physics / Ballarino, A (CERN) ; Bottura, L (CERN)
High Energy Physics has been consistently pushing the performance of technical superconductors, for the benefit of high field magnet technology. So far the workhorse for particle accelerators has been Nb-Ti, but the practical performance limit has been attained with the LHC. [...]
CERN-ACC-2015-0021.- Geneva : CERN, 2015 - 6 p. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments / Yang, I (-) ; Pelegrin, J (-) ; Young, EA (-) ; Falorio, I (-) ; Ballarino, A (CERN) ; Bottura, L (CERN) ; Miao, H (-) ; Huang, Y (-)
AC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K – 70 K) and ac field amplitude (≤0.2 T) as well as frequency (20 Hz – 2 kHz), this work shows (a) the full coupling of the non-twisted wire, (b) the uncoupling of sub-wires by twisting at moderate pitch up to 12 mm, (c) a relatively short time constant of milliseconds for the coupling current due to a high transverse resistivity, and (d) an effective (de)coupling diameter of 0.4mm about 1.6x of sub-wire bundles. [...]
CERN-ACC-2015-0020.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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A Feasibility Experiment of a W-powder Target in the HiRadMat Facility of CERN / Charitonidis, Nikolaos (CERN) ; Efthymiopoulos, Ilias (CERN) ; Fabich, Adrian (CERN) ; Caretta, Ottone (Rutherford) ; Davenne, Tristan (Rutherford) ; Densham, Chris (Rutherford) ; Fitton, Michael (Rutherford) ; Loveridge, Peter (Rutherford) ; Rivkin, Leonid (Ecole Polytechnique, Lausanne)
Granular solid targets made of fluidized tungsten powder or static pebble bed of tungsten spheres, have been long proposed and are being studied as an alternative configurations towards high-power (>1MW of beam power) target systems, suitable for a future Super Beam or Neutrino Factory. Serving the lack of experimental data on this field, a feasibility experiment was performed in HiRadMat facility of CERN/SPS that tried in a pulse-by-pulse basis to address the effect of the impact of the SPS beam (440GeV/c) on a static tungsten powder target. [...]
2013 - 3 p. - Published in : (2013) , pp. THPFI053 Published version from JACoW: PDF; External link: JACoW server
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.THPFI053

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X-ray imaging detector based on a position sensitive THCOBRA with resistive line / Silva, A L M (Aveiro U.) ; Azevedo, C D R (Aveiro U.) ; Carramate, L F N D (Aveiro U.) ; Lopes, T (Aveiro U.) ; Castro, I F (Aveiro U.) ; de Oliveira, R (CERN) ; Veloso, J F C A (Aveiro U.)
2013 - Published in : J. Instrum. 8 (2013) P05016 IOP Open Access article: PDF;

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Energy Deposition Studies for the Hi-Lumi LHC Inner Triplet Magnets / Mokhov, N V (Fermilab) ; Rakhno, I L (Fermilab) ; Striganov, S I (Fermilab) ; Tropin, I S (Fermilab) ; Cerutti, F (CERN) ; Esposito, L (CERN) ; Lechner, A (CERN)
A detailed model of the High Luminosity LHC inner triplet region with new large-aperture Nb3Sn magnets, field maps, corrector packages, and segmented tungsten inner absorbers was built and implemented into the FLUKA and MARS15 codes. In the optimized configuration, the peak power density averaged over the magnet inner cable width is safely below the quench limit. [...]
arXiv:1501.07623; FERMILAB-CONF-14-174-APC.- 2015 - 4 p. External links: Preprint; JACoW server
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.TUPRO028

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Vibrating-wire measurement method for centering and alignment of solenoids / Arpaia, P (CERN ; Sannio U.) ; Petrone, C (CERN ; Sannio U.) ; Russenschuck, S (CERN) ; Walckiers, L (CERN)
A method is proposed to center and align solenoids by means of a vibrating wire. The magnetic axis of a solenoid is defined as the path where the integral over the transversal field components takes its minimum. [...]
2013 - Published in : J. Instrum. 8 (2013) P11006 IOP Open Access article: PDF;

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