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CERN Published Articles

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2016-06-24
08:48
Inductive adders for replacing thyratron based modulators at CERN / Barnes, M J (CERN) ; Ducimetiere, L (CERN) ; Holma, J (CERN) ; Kramer, T (CERN) ; Fowler, A (CERN)
Line-type modulators, for example pulse forming lines and pulse forming networks, which use thyratron switches, are currently used in many pulse power systems at CERN. Solid-state modulators implemented with inductive adder technology could replace thyratron based designs in many applications and potentially improve dynamic range, maintainability and reliability of the systems. [...]
2015 - 10 p. - Published in : 10.1109/EPE.2015.7309160
In : 17th European Conference on Power Electronics and Applications, Geneva, Switzerland, 8-10 Sep 2015, pp.7309160

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2016-06-24
08:48
Measurements on prototype inductive adders with extreme flat-top output pulses for CLIC damping ring extraction kickers / Holma, Janne (CERN) ; Barnes, Michael J (CERN)
The specifications of the extraction kicker systems for the damping rings of the Compact Linear Collider call for 160 ns duration flat-top pulses of ±12.5 kV, 250 A, with combined ripple and droop of ±0.02 %. Pulse waveforms of two 3.5 kV prototype inductive adders have demonstrated ±0.05 % relative flat-top stability..
2015 - 8 p. - Published in : 10.1109/EPE.2015.7309138
In : 17th European Conference on Power Electronics and Applications, Geneva, Switzerland, 8-10 Sep 2015, pp.7309138

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2016-06-24
08:48
Use of GPUs in the LHCb trigger / Neufeld, Niko (CERN) ; Campora, Daniel (CERN) ; Badalov, Alexey (Ramon Llull U., Barcelona) ; Vilasis-Cardona, Xavier (Ramon Llull U., Barcelona)
The current strategy to incorporate Graphical Processing Units (GPU) in the LHCb trigger system, with a view on the upgrade of the detector, is presented. Two main aspects are described: the strategy to fit GPUs in the current software framework and the performance of a particular algorithm..
2015 - 4 p. - Published in : 10.1109/ECCTD.2015.7300055
In : 22nd European conference on circuit theory and design, Trondheim, Norway, 24-26 Aug 2015, pp.7300055

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2016-06-24
08:48
Radiation-hard active CMOS pixel sensors for HL-LHC detector upgrades / Backhaus, Malte (CERN) /ATLAS CMOS pixel
The luminosity of the Large Hadron Collider (LHC) will be increased during the Long Shutdown of 2022 and 2023 (LS3) in order to increase the sensitivity of its experiments. A completely new inner detector for the ATLAS experiment needs to be developed to withstand the extremely harsh environment of the upgraded, so-called High-Luminosity LHC (HL-LHC). [...]
2015 - 13 p. - Published in : J. Instrum. 10 (2015) C02031 Fulltext: PDF;
In : 10th International Conference on Position Sensitive Detectors, Surrey, UK, 7 - 12 Sep 2014, pp.C02031

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2016-06-24
08:48
VeloPix: the pixel ASIC for the LHCb upgrade / Poikela, Tuomas (Turku U. ; CERN) ; De Gaspari, M (CERN) ; Plosila, J (Turku U.) ; Westerlund, T (Turku U.) ; Ballabriga, R (CERN) ; Buytaert, J (CERN) ; Campbell, M (CERN) ; Llopart, X (CERN) ; Wyllie, K (CERN) ; Gromov, V (NIKHEF, Amsterdam) et al.
The LHCb Vertex Detector (VELO) will be upgraded in 2018 along with the other subsystems of LHCb in order to enable full readout at 40 MHz, with the data fed directly to the software triggering algorithms. The upgraded VELO is a lightweight hybrid pixel detector operating in vacuum in close proximity to the LHC beams. [...]
2015 - Published in : J. Instrum. 10 (2015) C01057
In : 7th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging, Niagara Falls, Ontario, Canada, 1 - 5 Sep 2014, pp.C01057

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2016-06-23
15:29
Upgrade of the CMS Global Muon Trigger / Jeitler, Manfred (Vienna, OAW) ; Lingemann, Joschka (CERN) ; Rabady, Dinyar (CERN) ; Sakulin, Hannes (CERN) ; Stahl, Achim (Aachen, Tech. Hochsch.)
The increase in center-of-mass energy and luminosity for Run-II of the Large Hadron Collider poses new challenges for the trigger systems of the experiments. To keep triggering with a similar performance as in Run-I, the CMS muon trigger is currently being upgraded. [...]
2015 - Published in : IEEE Trans. Nucl. Sci. 62 (2015) 1104-1109 IEEE Open Access article: PDF;

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2016-06-23
10:16
Development of a He/CdI$_2$ gas-jet system coupled to a surface-ionization type ion-source in JAEA-ISOL: towards determination of the first ionization potential of Lr (Z = 103) / Sato, T K (JAEA, Ibaraki) ; Asai, M (JAEA, Ibaraki) ; Sato, N (JAEA, Ibaraki) ; Tsukada, K (JAEA, Ibaraki) ; Toyoshima, A (JAEA, Ibaraki) ; Ooe, K (Niigata U. (main)) ; Miyashita, S (Hiroshima U. (main)) ; Kaneya, Y (JAEA, Ibaraki ; Ibaraki U., Grad. Sch. Sci. Eng.) ; Osa, A (JAEA, Ibaraki) ; Schädel, M (JAEA, Ibaraki) et al.
We report on development of a gas-jet transport system coupled to a surface ionization ion-source in the JAEA-ISOL (Isotope Separator On-Line) system. As a new aerosol material for the gas-jet system, CdI2, which has a low boiling point of 713 °C, is exploited to prevent deposition of the aerosol material on the surface of the ion-source. [...]
2015 - Published in : J. Radioanal. Nucl. Chem. 303 (2015) 1253-1257

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2016-06-23
09:59
From aerodynamics towards aeroacoustics: a novel natural velocity decomposition for the Navier-Stokes equations / Morino, Luigi (Rome III U.) ; Gradassi, Paolo (CERN)
A novel formulation for the analysis of viscous incompressible and compressible aerodynamics/aeroacoustics fields is presented. The paper is primarily of a theoretical nature, and presents the transition path from aerodynamics towards aeroacoustics. [...]
2015 - Published in : Int. J. Aeroacoustics 14 (2015) 161-192

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2016-06-23
09:09
Measurement of charged particle yields from therapeutic beams in view of the design of an innovative hadrontherapy dose monitor / Battistoni, G (INFN, Milan) ; Bellini, F (Rome U. ; INFN, Rome) ; Bini, F (U. Rome La Sapienza (main)) ; Collamati, F (Rome U. ; INFN, Rome) ; Collini, F (INFN, Milan) ; De Lucia, E (Frascati) ; Durante, M (Darmstadt, GSI) ; Faccini, R (Rome U. ; INFN, Rome) ; Ferroni, F (Rome U. ; INFN, Rome) ; Frallicciardi, P M (Enrico Fermi Ctr., Rome) et al.
Particle Therapy (PT) is an emerging technique, which makes use of charged particles to efficiently cure different kinds of solid tumors. The high precision in the hadrons dose deposition requires an accurate monitoring to prevent the risk of under-dosage of the cancer region or of over-dosage of healthy tissues. [...]
2015 - Published in : J. Instrum. 10 (2015) C02032 IOP Open Access article: PDF;

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2016-06-23
06:49
CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities / Houngbo, D (SCK-CEN, Mol) ; Popescu, L (SCK-CEN, Mol) ; Schuurmans, P (SCK-CEN, Mol) ; Delonca, M (CERN) ; Losito, R (CERN) ; Maglioni, C (CERN) ; Stora, T (CERN) ; Bricault, P (TRIUMF) ; Vierendeels, J (U. Gent (main))
In the context of the forthcoming next generation of Radioactive Ion Beams (RIBs) facilities based on an Isotope Separation On Line (ISOL) method, the development of production targets capable of dissipating the high power deposited by the primary beam is a major challenge. The concept of a high-power target based on a liquid Pb–Bi loop incorporating a heat-exchanger and a diffusion chamber was proposed within EURISOL DS and is being developed within the LIEBE1 project. [...]
2015 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 777 (2015) 202-210

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