CMS DT Chambers: Optimized Measurement of Cosmic Rays Crossing Time in absence of Magnetic Field

Two spare drift chambers produced in the I.N.F.N. Legnaro Laboratory (Padova, Italy) for the barrel muon spectrometer of the LHC CMS experiment have been extensively tested using cosmic-ray muons. A fitting algorithm was developed to optimize the determination of the time of passage of the particle. A timing resolution of $\approx$2~ns has been obtained. The algorithm permits the measurement of the track reconstruction precision of the chambers by using cosmic-ray data with the same accuracy obtained using high-energy test-beam data

LHCb Upgraded RICH 1 Engineering Design Review Report

During the Long Shutdown 2 of the LHC, the LHCb collaboration will replace the upstream Ring Imaging Cherenkov detector (RICH 1). The magnetic shield of the current RICH 1 will be modified, new spherical and plane mirrors will be installed and a new gas enclosure will be manufactured. New photon detectors (multianode photomultiplier tubes) will be used and these, together with their readout electronics, require a new mechanical support system. This document describes the new optical arrangement of RICH 1, its engineering design, installation and alignment. A summary of the project schedule and institute responsibilities is provided

LHCb Upgraded RICH 1 Engineering Design Review Report

During the Long Shutdown 2 of the LHC, the LHCb collaboration will replace the upstream Ring Imaging Cherenkov detector (RICH 1). The magnetic shield of the current RICH 1 will be modified, new spherical and plane mirrors will be installed and a new gas enclosure will be manufactured. New photon detectors (multianode photomultiplier tubes) will be used and these, together with their readout electronics, require a new mechanical support system. This document describes the new optical arrangement of RICH 1, its engineering design, installation and alignment. A summary of the project schedule and institute responsibilities is provided

First tests of DT insertion in SX5.

A first test of insertion has been perfomed with a MB2 chamber, and the tooling was presented for MB3 and MB4

Influence of Powder Particle Size Distribution on the printability of Pure Copper for Selective Laser Melting

This work investigates the use of fine Cu powder, with ~ 20 vol% smaller than 15 µm size, for the selective laser melting process. Cubes reaching > 98 % density are produced at relative low laser output (175 W) and characterized. After the selection of a proper combination of laser scan parameters, the properties of fabricated parts are briefly studied through profilometry and tensile tests. Finally, a voluminous demo component for high-energy physics is manufactured to stress-test the employed SLM machine. Even though unmolten particles and lack of fusion defects are still present in the produced specimens, the investigated approach confirms that powder selection can have a huge influence on the processability of materials with high reflectivity towards near-infrared irradiation.status: Published onlin

LHCb Upgraded RICH 2 Engineering Design Review Report

https://cds.cern.ch/record/215885

MUTOMCA: AN EXPERIMENT TO INVESTIGATE SPENT FUEL CASKS WITH MUON TOMOGRAPHY

Spent fuel stored in thick-walled strongly shielding casks can be indirectly verified through the application ofcontainment and surveillance measures. Assuring Continuity of Knowledge (CoK) of the spent fuel stored in dry spent fuelstorage facilities (SFSFs) for the upcoming decades is a cornerstone of safeguards. In the unlikely event that all Safeguardsrelatedcontainment and surveillance measures fail, a cask would need to be opened in the loading pond of a reactor. Therefore,substantially improved re-verification capabilities applicable to dry SFSFs are to be aimed at. The development of an adequatenon-destructive (re)-verification method for casks, proving the unchanged inventory of the verified spent fuel, would be a realadvantage for safeguards.Muon tomography could be a suitable method for the re-verification of self-shielding thick-walled spent fuel casks.To prove that the technology can detect the diversion of fuel assemblies, a two-modules muon detector has been designed andbuilt. It will be installed in the proximity of a spent fuel cask during a field test at a dry SFSF in Germany. The status of theproject and preliminary results will be presented

Test of CMS Muon Barrel Drift Chambers with Cosmic Rays

Production of the muon barrel drift chambers called MB3 for the CMS experiment at the LHC has started at Legnaro INFN Labs in 2001. Detectors are fully equipped with the final front-end and high-voltage boards, and test pulse and low-voltage systems. Before being moved to CERN, all chambers are tested and validated. After good noise level and proper high voltage behavior have been ensured, we collect cosmic-ray events triggered by an external scintillator system. We use those data to infer about the main parameters of the chambers, namely, detection efficiency, uniformity in the behavior, timing properties (resolution, uniformity, dependence on the track angle), and possible shifts of the wires and of the layers inside the superlayers. The method is particularly efficient in finding pathologies caused by trivial mistakes like, for example, an unconnected electrode, which can be quickly recovered

Study of the Internal Alignment of the CMS Muon Barrel Drift Chambers Using Cosmic Ray Tracks

This note describes the alignment studies performed on 21 Muon Barrel Drift Tube chambers for the CMS experiment, assembled in the INFN production center at the Legnaro National Laboratories. Data were collected using the cosmic ray test facility which was setup in Legnaro to test the chamber behaviour before being moved to CERN. An alignment procedure using cosmic ray tracks has been developed, allowing a measurement of the internal misalignment of the wire layers inside a chamber "superlayer" (SL) and of the relative misalignment of the 2 SL's in the r-phi bending plane. The analysis shows that the wire layers are positioned with an rms precision of about 45 micron; the relative positioning of the 2 SL's in the r-phi bending plane is meausured to have a distribution with ~ 50 micron average value and 200 micron rms