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2018-10-12
14:31
Prospects for future upgrade of the LHCb RICH system
Reference: Poster-2018-663
Created: 2018. -1 p
Creator(s): Easo, Sajan

The LHCb experiment has collected data corresponding to 6.9 fb-1 of integrated luminosity since 2010 and the two RICH detectors have been essential for most of the LHCb physics programme. Preparations are underway to install an upgraded RICH detector so that from 2021 onwards LHCb can collect data corresponding to 5 fb-1 of integrated luminosity per year in order to improve the statistical precision of the physics measurements and to search for very rare B-decays and D-decays. For this, the current Level 0 hardware trigger running at 1 MHz will be removed so that detectors can be read out at at the full collision rate of 40 MHz. The long term physics goals of LHCb calls for a further upgrade of the detector system for collecting data corresponding 50 fb-1 of integrated luminosity by 2029 and 300 fb-1 afterwards. The first set of such upgrades are envisaged for the run starting in 2026 where the luminosity in LHCb continues to be 2X1033 cm-2s-1 as in the preceeding years. For the run from 2030 onwards the luminosity in LHCb is planned to be 2X1034 cm-2s-1 and this will result in about 35 interactions per LHC bunch crossing. Hence the detectors would require a major upgrade to cope with the high occupancies resulting from the increased particle multiplicity. Feasibility studies are underway for recording the time of arrival of the RICH hits in addition to their spatial coordinates on the detector plane. The complexity of the event can be reduced by removing hits outside the signal time window and by separating out the hits created by tracks which originated in different primary vertices. Incorporating the RICH hit time information can also improve the performance of the particle identification algorithm.This requires using photon detectors with fast readout. The feasibility of this is expected to be tested using prototypes. Using a photon detector with increased quantum efficiency in the green, like a SiPM(silicon photomultiplier), one can help to improve the chromatic error without reducing the photon yield. Measures to improve the optical configuration of the RICH detectors and to improve their pixel granularity are being investigated. Extending the momentum range to improve the performance in the 1-10 GeV/c range and in the range above 70 GeV/c is also explored. One option for this is to develop novel radiators based on photonic crystals. An overview of all these developments will be presented. This will include the expected performances and the status of the feasibility studies from simulations and prototype testing.

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2018-10-12
14:28
Strategy and Automation of the Quality Assurance Testing of MaPMTs for the LHCb RICH Upgrade
Reference: Poster-2018-662
Created: 2018. -1 p
Creator(s): Gizdov, Konstantin

Strategy and Automation of the Quality Assurance Testing of MaPMTs for the LHCb RICH Upgrade 31 Jul 2018, 10:55 30m Russian Academy of Sciences Board: 25 poster presentation Technological aspects and applications of Cherenkov detectors Poster Session Speaker Konstantin Gizdov (University of Edinburgh) Description The LHCb RICH system will undergo major modifications for the LHCb Upgrade during the Long Shutdown 2 of the LHC, and the current photon detectors will be replaced by Multi Anode PMTs. The operating conditions of the upgraded experiment puts forth significant requirements onto the MaPMTs in terms of their performance, durability & reliability. Presented is an overview of the testing facilities designed and used to vet 3100 units of Hamamatsu 1-inch R13742 and 450 units of Hamamatsu 2-inch R13743 during the short 2 year testing period. Furthermore, discussed are the hardware architecture, the different read-out, power and control components, as well as the novel extensible software framework to steer the procedure. Finally, the operation of four automated stations, that have been deployed in two separate labs, is reported, with each station capable of fully characterising 16 MaMPTs per day.

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2018-10-12
14:16
The micro-Resis7ve WELL detector for the phase 2 upgrade of the LHCb muon detector
Reference: Poster-2018-661
Created: 2018. -1 p
Creator(s): Morello, Gianfranco

he LHCb experiment is a single-arm spectrometer dedicated to the study of the CP viola7on and other rare phenomena in the decay of Beauty par7cles. One of its feature is a fast and versa7le trigger system to select the interes7ng events. The apparatus is designed like a fixed-target experiment due to the very forward peaked b-quark distribu7on at LHC. It is composed of five systems: vertexing, tracking, ring cherenkov detectors, the calorimeters and the muon system. Up to the end of 2017 LHCb has recorded a total luminosity of 7 g-1 and in the next year, since LHC is going to increase its luminosity, the apparatus needs to upgrade its system. For the first phase only the replacement of the FEE will be done. For the phase 2, the detectors should show a rate capability up to 3 MHz/cm2, an efficiency for single gap > 95% within 25 ns (BX), stability up to 6 C/cm2 integrated charge in 10 y at G=4000. So we propose for this upgrade the micro-Resis7ve WELL.

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2018-10-12
14:13
PID Techniques and Performance at LHCb in Run 2
Reference: Poster-2018-660
Created: 2018. -1 p
Creator(s): Hushchyn, Mikhail

Particle identification (PID) plays a crucial role in LHCb analyses. The LHCb PID system is com- posed of two ring-imaging Cherenkov detectors, a series of muon chambers and a calorimeter system. Combining information from these subdetectors allows one to distinguish between various species of long-lived charged and neutral particles. Advanced multivariate techniques are employed to obtain the best PID performance and control systematic uncertainties in a data-driven way. A novel strategy has been introduced in Run 2, where the selection of PID calibration data is implemented in the LHCb software trigger, with further processing achieved through a centralised production that makes highly efficient use of computing resources. This poster covers the major steps of the implementation, and highlights the PID performance achieved in Run 2.

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2018-10-12
14:06
R&D on CO2 Cooling using a Silicon Microchannel Substrate for the LHCb VELO Upgrade
Reference: Poster-2018-659
Created: 2018. -1 p
Creator(s): Franco Lima, Vinicius

The new Vertex Locator (VELO) detector (Figure 1) will replace the silicon micro-strip detector currently operating around the interaction point in the LHCb Experiment. It will use hybrid pixel detectors composed of silicon sensors bump-bonded to new VeloPix CMOS readout chips designed for the new 40MHz readout rate of the LHCb Upgrade.

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2018-10-12
10:56
R&D on CO2 Cooling using a Silicon Microchannel Substrate for the LHCb VELO Upgrade
Reference: Poster-2018-658
Created: 2018. -1 p
Creator(s): Franco Lima, Vinicius

The new Vertex Locator (VELO) detector (Figure 1) will replace the silicon micro-strip detector currently operating around the interaction point in the LHCb Experiment. It will use hybrid pixel detectors composed of silicon sensors bump-bonded to new VeloPix CMOS readout chips designed for the new 40MHz readout rate of the LHCb Upgrade.

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2018-10-12
10:49
Reconstruction at 30 MHz for the LHCb upgrade
Reference: Poster-2018-657
Created: 2018. -1 p
Creator(s): Szumlak, Tomasz

The Run 2 data taking period is coming to its end this year (2018). With the upcoming Long Shutdown 2 (LS2) that will last till the end of 2020 we enter the upgrade era for the LHC based experiments. The LHCb experiment is going for a major upgrade that practically affects all hardware components of the experimental setup as well as the DAQ and trigger. The LHCb event reconstruction procedure needs to face the challenge of fulfilling extremally tight time constraints imposed by a fully software trigger system running at the LHC bunch crossing frequency of 30 MHz. At the same time this real time system must ensure the high level of physics performance needed by the LHCb scientific programme. This challenge requires rethinking and optimising the logic of the algorithms, exploiting to the best the detectors properties and adopting out-of-the-box innovative ideas.

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2018-10-12
10:46
Radiation Damage of LHCb's Silicon Detector Systems
Reference: Poster-2018-656
Created: 2018. -1 p
Creator(s): Abellan Beteta, Carlos

The LHCb is a successful experiment taking data at the LHC since 2009. Vertex and track reconstruction in the regions with highest particle occupancies are performed with a set of micro silicon-strip detectors, consisting of the VErtex LOcator (VELO) and the Silicon Tracker (ST). The detectors have performed very well throughout Run 1 of the LHC, but face new operational challenges in the LHC Run 2 environment with the reduced bunch separation of 25 ns and higher particle multiplicities. The cumulative radiation damage poses challenges in reaching full depletion in the most irradiated zones of the detectors, which have highly non-uniform exposure, reaching fluences of 0.01-4×1014 1-MeV neq/cm2 in the same sensor. The overall damage is monitored through regular measurements of the leakage current and charge collection efficiency (CCE) as function of the bias voltage. The radiation damage has been shown to decrease the collection of signal by the strip implants due to charge accumulation in the SiO2 layer, reducing the shielding effect to the routing lines in the sensors with 2-metal layer readout. A TCAD simulation was implemented using the Perugia n-type bulk model and the Peltola surface damage model concluding that up to 60% of the charge is collected by the routing lines. Studies of radiation damage throughout runs 1 and 2 of the VELO and ST will be presented.

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2018-10-12
10:43
A new readout electronics for the LHCb Muon Detector Upgrade
Reference: Poster-2018-655
Created: 2018. -1 p
Creator(s): Brundu, Davide

The 2019 upgrade of LHCb Muon System foresees a trigger-less 40 MHz readout scheme and requires the development of a new Off Detector Electronics (nODE) board, based on the nSYNC, a radiation tolerant custom ASIC developed in UMC 130 nm technology. The muon readout electronics has the purpose to process the digital signals from the front-end electronics, performing bunch crossing alignment, data zero suppression, time measurements. With respect to the current system, the new boards will allow a muon system readout at 40 MHz (the bunch crossing frequency at LHC), thanks to the nSYNC functionnalities, and the new optical communication system based on the GBTx driver/serializer chipset.

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2018-08-22
18:01
CDS Videos - The new platform for CERN videos
Reference: Poster-2018-654
Created: 2018. -1 p
Creator(s): Marian, Ludmila; Gabancho, Esteban; Gonzalez Lopez, Jose Benito; Tarocco, Nicola; Costa, Flavio [...]

CERN Document Server (CDS, cds.cern.ch) is the CERN Institutional Repository based on the Invenio open source digital repository framework. It is a heterogeneous repository, containing more than 2 million records, including research publications, audiovisual material, images, and the CERN archives. Its mission is to store and preserve all the content produced at CERN as well as to make it easily available to any outlet interested. CDS aims to be the CERN’s document hub. To achieve this we are transforming CDS into an aggregator over specialized repositories, each having its own software stack, with features enabled based on the repository’s content. The aim is to enable each content producer community to have its own identity, both visually and functionally, as well as increased control on the data model and the submission, curation, management, and dissemination of the data. This separation is made possible by using the Invenio 3 framework. The first specialized repository created is CDS Videos (videos.cern.ch). It has been launched in December 2017, and is the first step in the long-term project to migrate the entire CDS to the Invenio 3 framework. CDS Videos provides an integrated submission, long-term archival and dissemination of CERN video material. It offers a complete solution for the CERN video team, as well as for any department or user at CERN, to upload video productions. The CDS Videos system will ingest the video material, interact with the transcoding server for generating web and broadcaster subformats, mint DOI persistent identifiers, generate embeddable code to be reused by any other website, and store the master files for long-term archival. The talk will detail the software architecture of the CDS Videos as well as the infrastructure needed to run such a large-scale web application. It will present the technical solutions adopted, including the Python-based software stack (using among others Flask, IIIF, ElasticSearch, Celery, RabbitMQ) and the new AngularJS-based user interface which was exclusively designed for CDS Videos. It will also present our solution to a lossless migration of data: more than 5'000 videos from 1954 to 2017, summing up to 30TB of files, have been migrated from DFS to EOS in order to populate the CDS Videos platform. All this could be of high interest to other institutes wanting to reuse the CDS Videos open source code for creating their own video platform. Last but not least, the talk will detail how the user community at CERN and beyond can take advantage of the CDS Videos platform for creating and disseminating video content.

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Open Days 2013 Posters (58)