CERN Accelerating science

Published Articles

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2018-04-21
06:12
Realization and First Test Results of the EuCARD 5.4-T REBCO Dipole Magnet / Durante, Maria ; Borgnolutti, Franck ; Bouziat, Denis ; Fazilleau, Philippe ; Gheller, Jean-Marc ; Molinie, Frederic ; De Antoni, Philippe
Abstract: A high-temperature critical superconductor (HTS) dipole magnet relying on 12-mm REBCO tapes was built at CEA Saclay in 2016. Magnet studies had been started in the framework of the EuCARD High Field Magnet program and continued within a collaboration agreement between CEA-Saclay and CERN. [...]
2018 - Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4203805
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4203805

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2018-04-21
06:12
Measurement of the ratio of branching fractions $\mathcal{B}(B^0 \to D^{*-}\tau^{+}\nu_\tau)/\mathcal{B}(B^0 \to D^{*-}\mu^{+}\nu_\mu)$ with $\tau$ three-prong decays / Wormser, Guy (Orsay, LAL) /LHCb
The prospects of a measurement of the branching fraction ratio $\mathcal{R}(D^*) \equiv \mathcal{B}(B^0 \to D^{*−} \tau^+ \nu_{\tau})/ \mathcal{B}(B^0 \to D^{*−} \mu^+ \nu_{\mu})$ is performed by using a data sample, corresponding to $3 \text{fb}^{−1}$ integrated luminosity, collected by LHCb at center-of-mass energies of 7 and 8 TeV during the LHC Run 1. The $\tau$ lepton is reconstructed in the hadronic decay with three charged pions. [...]
ARISF, 2017 - 8 p. - Published in : (2017) , pp. 203-210 Fulltext: PDF;
In : 52nd Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 18 - 25 Mar 2017, pp.203-210

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2018-04-21
06:12
A 600 kW power supply for particle accelerators insensitive to electrical network perturbations / Josifovic, I (CERN) ; Bastos, M C (CERN) ; Le Godec, G (CERN) ; Burnet, J P (CERN) ; Romera, I (CERN) ; Zerlauth, M (CERN) ; Werner, M (DESY)
The papers presents implementation of a 600 kW DC power converter resistant to electrical network perturbations on an 18 kV electrical network feeding the input of the power converter. The manuscript describes experimental assessment of converter output performance during both nominal electrical network conditions and transient grid voltage dips..
2017 - 10 p. - Published in : 10.23919/EPE17ECCEEurope.2017.8099278
In : 19th European Conference on Power Electronics and Applications, Warsaw, Poland, 11 - 14 Sep 2017, pp.8099278

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2018-04-21
06:12
Thermal stressing mitigation possibility intended for a DC-current magnet supply based on high power IGBT modules / Asimakopoulos, P (Chalmers U. Tech. ; CERN) ; Papastergiou, K D (CERN) ; Thiringer, T (Chalmers U. Tech.) ; Bongiorno, M (Chalmers U. Tech.)
This work investigates the possibility to reduce the thermal stressing of high power IGBT modules in a DC-current application. Using four load current profiles as examples, two mitigation strategies are presented and their benefit to the power stack in terms of lifetime prolongation is evaluated. [...]
2017 - 9 p. - Published in : 10.23919/EPE17ECCEEurope.2017.8099201
In : 19th European Conference on Power Electronics and Applications, Warsaw, Poland, 11 - 14 Sep 2017, pp.8099201

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2018-04-21
06:12
Development of a 100 kW, 12.5 kV, 22 kHz and 30 kV insulated medium frequency transformer for compact and reliable medium voltage power conversion / Isler, Stephane (ABB SECHERON SA, Satigny) ; Chaudhuri, Toufann (ABB SECHERON SA, Satigny) ; Aguglia, Davide (CERN) ; Bonnin, Xavier Abel (CERN)
This paper presents the critical design aspects addressed during the development of a 100 kW, 12.5 kV, 22 kHz, and 30 kV insulated medium frequency transformer used in a power converter. The transformers are used in a resonant multilevel converter topology producing HV DC voltage from a three phase 400 V AC industrial grid. [...]
2017 - 10 p. - Published in : 10.23919/EPE17ECCEEurope.2017.8099196
In : 19th European Conference on Power Electronics and Applications, Warsaw, Poland, 11 - 14 Sep 2017, pp.8099196

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2018-04-21
06:12
Hybrid capacitor discharge/switch-mode converter for pulsed applications: Topology and control design / Horrein, Ludovic (CERN) ; Cravero, Jean-Marc (CERN)
The paper objective is to propose an innovative power converter topology combining the advantages of capacitor discharge and switch-mode converters to generate half sinusoidal fast current pulses with high precision. The capacitor discharge operation mode of the converter allows the generation of current pulses with fast transient response and the switch-mode operation enables the control of the pulse shape with high precision. [...]
2017 - 10 p. - Published in : 10.23919/EPE17ECCEEurope.2017.8099101
In : 19th European Conference on Power Electronics and Applications, Warsaw, Poland, 11 - 14 Sep 2017, pp.8099101

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2018-04-21
06:12
Thermal behaviour of DC power inductor of 600 kW power supply for particle accelerators / Matejevic, D (CERN) ; Josifovic, I (CERN) ; Papastergiou, K (CERN) ; Le Godec, G (CERN) ; Burnet, J P (CERN)
The paper investigates a thermal behaviour of a DC inductor deployed in a 600 kW power converter for particle accelerators. The inductor is manufactured from electrical steel core and two magnetically coupled windings with integrated air ducts for enhanced air circulation. [...]
2017 - 10 p. - Published in : 10.23919/EPE17ECCEEurope.2017.8099279
In : 19th European Conference on Power Electronics and Applications, Warsaw, Poland, 11 - 14 Sep 2017, pp.8099279

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2018-04-21
06:12
The upgrade of the ALICE Inner Tracking System / Ravasenga, Ivan (Turin Polytechnic ; INFN, Turin) /ALICE
In 2021, for the third run of the CERN Large Hadron Collider (LHC), Pb-Pb collisions will be performed at a centre-of-mass energy per nucleon of 5.5 TeV, with an integrated luminosity of $6 \times 10^{27}$ cm$^{-2}$ s$^{-1}$ and at an unprecedented interaction rate up to 50 kHz. To fulfil the requirements of the ALICE physics program for Run 3, the ALICE experiment at LHC is planning a major upgrade during the Long Shutdown 2 of LHC in 2019-2020. [...]
SISSA, 2017 - 8 p. - Published in : PoS BORMIO2017 (2017) 058 Fulltext: PDF; External link: PoS server
In : 55th International Winter Meeting on Nuclear Physics, Bormio, Italy, 23 - 27 Jan 2017, pp.058

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2018-04-21
06:12
Open heavy-flavour measurements in Pb-Pb collisions with ALICE at the LHC / Mischke, André (Utrecht U. (main)) /ALICE
The ALICE experiment has measured charm and beauty production in Pb–Pb collisions at $\sqrt{S_{\rm{NN}}}= 2.76 \text{ TeV}$ and $5.02 \text{ TeV}$, via the reconstruction of hadronic D-meson decays and semi-leptonic Dand B-meson decays. In this contribution, an overview is given on current open heavy-flavour results from ALICE ranging from the nuclear modification factor to elliptic flow measurements and on the interpretation of the data by comparing with different model calculations of in-medium energy loss..
SISSA, 2017 - 10 p. - Published in : PoS BORMIO2017 (2017) 017 Fulltext: PDF; External link: PoS server
In : 55th International Winter Meeting on Nuclear Physics, Bormio, Italy, 23 - 27 Jan 2017, pp.017

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2018-04-21
06:12
Characterization of the pixel module for the ALICE ITS upgrade / Barile, Francesco (INFN, Bari) /ALICE
The ALICE Collaboration is preparing a major upgrade of the experimental apparatus, planned for installation in the second long LHC shutdown m the years 2019-2020. The key element of the ALICE upgrade is the construction of the new high resolution Inner Tracking System (ITS). [...]
2017 - 6 p. - Published in : 10.1109/IWASI.2017.7974226
In : 7th IEEE International Workshop on Advances in Sensors and Interfaces, Vieste, Italy, June 15-16, 2017, pp.101-106

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