LHC - New LHCb data acquisition system tested for the first time

During the LHC pilot tests at the end of October, the new LHCb data acquisition system prepared for Run 3 was tested for the first time. This system no longer uses a hardware trigger, so the 40 Tbit/s data rate will be transmitted entirely to ~200 servers, also hosting graphics cards on which the first real-time data analysis and selection of data in real time.

The LHCb team at CPPM is very active in the data acquisition system, having on the one hand developed the data acquisition cards (PCIe40) that receive the data and transmit them to the servers, and to the servers, and also playing a major role in the trigger on GPUs.

At the end of October, the PCIe40 cards were successfully operated for the first time with real data from the three systems already installed: the calorimeters, the muon detector and the RICHs.

During these tests, the trigger was also integrated and selected proton collisions for the first time using the information from the calorimeter. Not all graphics cards were installed in the servers yet, but the software was tested on the server CPUs and some of the available graphics cards in October.

This is a major step towards the commissioning of the complete system.

Dernière modification: Dec 2, 2021, 4:21:56 PM

Additional detection units for the KM3NeT/ORCA underwater neutrino detector

The underwater neutrino detector KM3NeT/ORCA investigates the limits of Matter and of the Universe at a depth of 2450 metres in the Mediterranean Sea. It allows to search for cosmic neutrinos and to study their fundamental properties. This detector is being installed and will eventually feature a hundred detection lines with sensors that are very sensitive to the light emitted by muons, particles that are the result of neutrinos, real cosmic messengers. On November 22, four new lines were added to the six existing ones and are working perfectly. Thus, more data will be studied by the scientific teams.

On November 19, the KM3NeT team boarded on Castor, a Foselev Marine vessel, with the detection lines. The Janus, a SAAS/Comex Marine oceanographic research and underwater intervention vessel, was also on site, at about 40 km offshore La Seyne-sur-Mer. The operation at sea was a large one, as seven lines were to be deployed, but the sea state rapidly deteriorated and the operation had to be shortened. Nevertheless, four lines were installed on the seabed and connected to the junction box, thanks to an ROV (Remotely Operated Underwater Vehicle). The junction box is a real masterpiece of the installation because it is from this device that is also connected the electro-optical cable of about 40 kilometres through which all the data transit to the control station on land and will be analysed by the scientists of the KM3NeT international collaboration.

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Castor et Janus boats, photo credit: KM3NeT Collaboration
Junction Box, photo credit: KM3NeT Collaboration
KM3NeT team on the Janus, photo credit: KM3NeT Collaboration
KM3NeT team on the Castor, photo credit: KM3NeT Collaboration
Dernière modification: Dec 1, 2021, 4:04:58 PM

Protons are back in the LHC!

After more than two years of maintenance and upgrades to the collider and detectors, pilot tests of the LHC are underway.

Splash events (particle flows from the interaction between the beams and a collimator located upstream of the detector) have been recorded, notably by the ATLAS and LHCb experiments. The first proton frictions at the LHC injection energy (450 GeV per beam) in stable mode took place at the end of October. This allowed the two detectors to record their first data and to validate their correct operation.

The next step is the start of Run 3 in March 2022, when the LHC will increase its energy in the center of mass from 13 to 13.6 TeV.

The LHC has just started the circulation of the beams at the injection energy (2x450 GeV) in stable mode and ATLAS records these data and in particular with its liquid argon calorimeter (LAr) which has had a major update in which the CPPM team is very active. The LAr system has just transmitted for the first time data with this new readout system in its fully updated configuration and in particular to the new first level calorimetric triggering system. This is a major step towards Run 3 which will start in spring 2022.

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LHCb collaboration members
particle collisions in the ATLAS detector
Dernière modification: Dec 1, 2021, 5:35:51 PM