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# Posters

2014-11-27
09:35
LHCb : A generic firmware core to drive the Front-End GBT-SCAs for the LHCb ugprade
 Reference: Poster-2014-462 Keywords:  LHCb  LHC  Upgrade  trigger-less electronics  GBT  GBT-SCA  TFC  ECS Created: 2014. -1 p Creator(s): Alessio, Federico; Caplan, Cairo; Gaspar, Clara; Jacobsson, Richard; Wyllie, Ken The LHCb experiment has proposed an upgrade towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity. The entire Front-End electronics will be upgraded in order to cope with higher sub-detector occupancy, higher data rate and to work in a complete trigger-less fashion. In this paper, we describe a novel way to transmit slow control information to the Front-End electronics, by profiting from bidirectional optical connections and the GBT and GBT-SCA chipset capabilities. The implementation and preliminary validation tests are shown as well Related links:LHCb conference © CERN Geneva Access to files

2014-11-27
09:25
LHCb : Clock and timing distribution in the LHCb upgraded detector and readout system
 Reference: Poster-2014-461 Keywords:  LHCb  LHC  Upgrade  trigger-less electronics  TFC  clock  timing Created: 2014. -1 p Creator(s): Alessio, Federico; Baron, S; Barros Marin, M; Cachemiche, JP; Hachon, F [...] The LHCb experiment is upgrading part of its detector and the entire readout system towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity and increase its trigger efficiency. In this paper, the new timing, trigger and control distribution system for such an upgrade is reviewed with particular attention given to the distribution of the clock and timing information across the entire readout system, up to the FE and the on-detector electronics. Current ideas are here presented in terms of reliability, jitter, complexity and implementation. Related links:Conference poster © CERN Geneva Access to files

2014-11-26
15:11
ALICE Detector Control System
 Reference: Poster-2014-460 Keywords:  ALICE  Detector Control System  LHC Created: 2014. -1 p Creator(s): Chochula, P The Detector Control System (DCS) is responsible for SAFE and STABLE operation of the ALICE experiment. The DCS interacts with ALICE Online and Offline systems as well as with external services. © CERN Geneva Access to files

2014-11-24
14:02
LHCb : A Scintillating Fibre Trackind Detector for the LHCb Upgrade
 Reference: Poster-2014-459 Keywords:  LHCb Created: 2014. -1 p Creator(s): Lindner, Rolf LHCb is preparing the upgrade which is scheduled to be installed in 2018/19. The Scintillating Fibre (SciFi) Tracker will be designed to replace the current tracking system downstream of the magnet, required to run at an increased luminosity of 1 - 2 10$^{33}$ cm$^{-2}$s$^{-1}$ and to collect a total of 50fb$^{-1}$ of data. The readout of the detector will be at 40MHz, applying a full software based trigger for every single bunch crossing. The SciFi Tracker consists of 12 planes covering a total surface of 350 m2. Modules are based on 2.5 m long multilayer ribbons made of 250 um diameter scintillating fibres as the active medium and signal transport. Silicon photomultiplier (SiPM) arrays with 128 channels at a width of 250 um are used for the readout. The signals from the SiPMS are digitized on an ASIC chip before reconstructing the track hit position within an FPGA on the front-end board. Several challenges facing this detector and the significant progress over the last year will be presented regarding the precision construction of the large active detector components, the radiation hardness of the scintillating fibers and the SiPMs, the high density readout electronics, and the necessary cooling system Related links:IEEE 2014 Conference © CERN Geneva Access to files

2014-11-21
15:40
First evidence for the rare decay $B^0_S\rightarrow\mu^+\mu^-$
 Reference: Poster-2014-458 Created: 2014. -1 p Creator(s): Tolk, Siim; Blake, Thomas LHCb observed evidence for a very rare decay of a neutral $B_S$ meson into a pair of muons[1]. The probability that the background could produce such an excess or larger is mere 5.3 x $10^{-4}$. This corresponds to signal significance of 3.5 standard deviations in the combined 1.0fb$^{-1}$ of 2011 (√s=7TeV) and 1.11f$^{-1}$ of 2012 (√s=8TeV) data. Related links:Conference LHCP 2014 © CERN Geneva Access to files

2014-11-21
15:24
LHCb Observation of photon polarization in the $b\rightarrow s\gamma$ transition
 Reference: Poster-2014-457 Created: 2014. -1 p Creator(s): Veneziano, Giovanni; Blake, Thomas The Standard Model (SM) predicts that the photon emitted in $b\rightarrow s\gamma$ transitions is predominantly left-handed. While the measured inclusive $b\rightarrow s\gamma$ rate agrees with the SM calculations, no direct evidence exists for a nonzero photon polarization $\lambda_\gamma$ in this type of decays. Several extensions of the SM, compatible with all current measurements, predict that the photon acquires a significant right-handed component. Related links:Conference LHCP 2014 © CERN Geneva Access to file

2014-11-20
14:48
A Feasibility Experiment of a W-powder Target
 Reference: Poster-2014-456 Created: 2014. -1 p Creator(s): Charitonidis, N; Efthymiopoulos, I; Carreta, O; Densham, C; Davenne, T [...] The development of high‐power targets remains a key R&D activity for future facilities presently under study like the Neutrino Factory, Muon Collider or upgraded high‐ power super beams for long‐baseline neutrino experiments.  The choice of materials to sustain the beam power ranging up to MW levels is not trivial. Granular solid targets have been proposed and are being studied as a candidate for such high‐power target systems. In the recently commissioned HiRadMat facility at CERN, a feasibility  experiment of a tungsten powder target was performed. The experiment was designed to explore for ﬁrst time the impact of a high‐power proton beam on a static W-powder target in a thimble conﬁguration. The diagnostics of the experiment were based on remote high speed photography as well as on laser‐doppler vibration measurements of the target containers. Results from the experimental ﬁndings are presented in this poster. © CERN Geneva Access to files

2014-11-20
14:01
HiRadMat at CERN/SPS - A dedicated facility providing high intensity beam pulses to material samples
 Reference: Poster-2014-454 Created: 2014. -1 p Creator(s): Li, Yiming The production of $J/ψ$ and $Υ(1 S)$ mesons decaying into dimuon final state is studied at the LHCb experiment, with rapidity 1.5 < y < 4.0 or − 5.0 < y < − 2.5 in proton-lead collisions at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{NN}}$ = 5 TeV, based on a data sample corresponding to an integrated luminosity of 1.6 nb −1. The nuclear modification factor and forward-backward production ratio are determined for prompt $J/ψ$, $J/ψ$ from b-hadron decay and $Υ(1 S)$ mesons in study of the cold nuclear matter effects. Related links:Conference LHCP 2014 © CERN Geneva Access to files