# Measurement - CERN (European Council for Nuclear Research)

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###### Last Updated: 22 September 2022

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##### The PolariX-TDS Project: Bead-Pull Measurements and High-Power Test on the Prototype

A joint effort by DESY, PSI, and CERN has been established to develop and produce an advanced modular X-band transverse deflection structure system with the added capability of providing variable polarization of the deflecting force. The prototype of the novel X-band TDS, the Polarizable X-band TDS, was produced at PSI by following the high-precision tuning-free manufacturing process used for the SwissFEL's C-band Linac.

##### First measurement of the top quark pair production cross section in proton-proton collisions at $\sqrt{s}=13.6\,\mathrm{TeV}$

At the first measurement of the top quark pair's production cross section in proton-proton collisions is shown. A maximum likelihood fit is achieved to event categories defined by the number and varieties of the leptons and the number of jets and jets identified as originating from b hadrons' decay.

##### Highlights of the ATLAS Top Quark Precision Measurements

The large top quark samples in the top quark pair and single top production have yielded measurements of the production cross-section of unprecedented precision and in new kinematic frameworks.

##### Impact of inter-gain calibration on positron energy measurement with the CMS High Granularity Calorimeter

One of the main upgrades for the CMS experiment, as the replacement of existing endcap calorimeter with a new High Granularity Calorimeter is required for the forthcoming High Luminosity operations of the LHC. The calorimeter is being upgraded in order to withstand the large amount of radiation exposure anticipated at the HL-LHC while also providing fine transverse and longitudinal granularity, as well as precise timing capabilities in order to distinguish the pile up contribution within specific events. More than 6 million independently readout channels will be available with the HGCAL, which will be based on silicon sensors and scintillator tiles directly readout with the silicon photomultipliers. A prototype system was exposed to beams of positrons with energies ranging from 20 Gev to 300 GeV in CERN's beam test experiments in October 2018.

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