CERN Accelerating science

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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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2016-06-24
07:40
Transient cerebral hypoperfusion and hypertensive events during atrial fibrillation: a plausible mechanism for cognitive impairment / Anselmino, Matteo ; Scarsoglio, Stefania ; Saglietto, Andrea ; Gaita, Fiorenzo ; Ridolfi, Luca
Atrial fibrillation (AF) is associated with an increased risk of dementia and cognitive decline, independent of strokes. Several mechanisms have been proposed to explain this association, but altered cerebral blood flow dynamics during AF has been poorly investigated: in particular, it is unknown how AF influences hemodynamic parameters of the distal cerebral circulation, at the arteriolar and capillary level. [...]
arXiv:1606.07368.- 2016 - 8 p. - Published in : Scientific Reports 6 (2016) 28635 External link: Preprint

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2016-06-24
07:40
Equation of state for hard sphere fluids offering accurate virial coefficients / Tian, Jianxiang ; Jiang, Hua ; Gui, Yuanxing ; Mulero, A
The asymptotic expansion method is extended by using currently available accurate values for the first ten virial coefficients for hard sphere fluids. It is then used to yield an equation of state for hard sphere fluids, which accurately represents the currently accepted values for the first sixteen virial coefficients and compressibility factor data in both the stable and the metastable regions of the phase diagram..
arXiv:1606.07182.- 2016 - 24 p. - Published in : Phys. Chem. Chem. Phys., 11(47): 11213-11218, 2009 External link: Preprint

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2016-06-24
07:40
New Closed Virial Equation of State for Hard-Sphere Fluids / Tian, Jianxiang ; Gui, Yuanxing ; Mulero, Angel
A new closed virial equation of state of hard-sphere fluids is proposed which reproduces the calculated or estimated values of the first sixteen virial coefficients at the same time as giving very good accuracy when compared with computer simulation data for the compressibility factor over the entire fluid range, and having a pole at the correct closest packing density..
arXiv:1606.07181.- 2016 - 16 p. - Published in : Journal of Physical Chemistry B, 114(42): 13399-13402, 2010 External link: Preprint

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2016-06-24
07:40
New Virial Equation of State for Hard-Disk Fluids / Tian, Jianxiang ; Gui, Yuanxing ; Mulero, A
Although many equations of state of hard-disk fluids have been proposed, none is capable of reproducing the currently calculated or estimated values of the first eighteen virial coefficients at the same time as giving very good accuracy when compared with computer simulation values for the compressibility factor over the whole fluid range. A new virial-based expression is here proposed which achieves these aims. [...]
arXiv:1606.07180.- 2016 - 21 p. - Published in : Phys. Chem. Chem. Phys., 12(20):5248 -5255, 2010 External link: Preprint

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2016-06-24
07:40
Asymptotic expansion based equation of state for hard-disk fluids offering accurate virial coefficients / Tian, Jianxiang ; Gui, Yuanxing ; Mulero, A
Despite the fact that more that more than 30 analytical expressions for the equation of state of hard-disk fluids have been proposed in the literature, none of them is capable of reproducing the currently accepted numeric or estimated values for the first eighteen virial coefficients. Using the asymptotic expansion method, extended to the first ten virial coefficients for hard-disk fluids, fifty-seven new expressions for the equation of state have been studied. [...]
arXiv:1606.07179.- 2016 - 31 p. - Published in : Phys. Chem. Chem. Phys., 12(41):13597-13602, 2010 External link: Preprint

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