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| Bachelor Thesis | PUBDB-2020-03978 |
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2020
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Please use a persistent id in citations: doi:10.3204/PUBDB-2020-03978
Abstract: The LHC, along with all of its experiments, is going through an upgrade. The currentLHC, designed for an integrated luminosity of 300 fb$^{-1}$ , will be upgraded to the HighLuminosity LHC (HL-LHC), providing an increased collision rate and will deliver morethan 3000 fb$^{-1}$ luminosity. All LHC experiments will undergo an upgrade to cope withthe increased luminosity. For the upgrade of the CMS new endcaps have to be designedand built. The main mechanical element of the endcaps will be the half disks with embeddedcooling pipes and detector module positioning inserts. A prototype of a part ofthe endcap half disk has been built and is being studied. During the course of this thesis,measurements were carried out on the prototype to check the precision of various mechanicalelements such a reference inserts or the module inserts, which will be used toposition the detector modules. The measurements were carried out with the metrologyarm made specifically for precision measurements. In order to check the accuracy of thearm different studies were carried out such as the calibration of the probes and the influenceof the movement of the metrology arm with respect to the object. The result ofthe measurement of the prototype demonstrated the cause of a misalignment of inserts,however almost all positions were within specification.
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