Abstract

In order to cope with the required precision tracking and trigger capabilities from Run III onwards in the ATLAS experiment, the innermost layer of the Muon Spectrometer endcap (Small Wheels) will be upgraded. Each of the two New Small Wheels (NSW) will be equipped with eight layers of MicroMegas (MM) detectors and eight layers of small-strip Thin Gap Chambers (sTGC), both arranged in two quadruplets. MM detectors of large size (up to 3 m2) will be employed for the first time in HEP experiments. Four different types of MM quadruplets modules (SM1, SM2, LM1, LM2), built by different Institutes, will compose the NSW. The Italian INFN is responsible for the construction of the SM1 modules. The construction is shared among different INFN units, Pavia being responsible for the readout panel construction. Due to the challenging mechanical specifications (with precisions of tens of microns over meters), the construction procedure has been optimized to obtain the required strip alignment precision in the panel. A number of data quality checks on both the components and the assembled panels are also needed to meet the required specifications.

Highlights

  • Experiment, the innermost layer of the Muon Spectrometer endcap (Small Wheels) will be upgraded

  • Gap Chambers, both arranged in two quadruplets

  • The Italian INFN is responsible for the construction of the SM1 modules

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Summary

I NTRODUCTION

Part of the Phase-I upgrade [1] of the ATLAS experiment is the replacement of the existing Small Wheels in the end-cap region of the Muon Sprectrometer with the NSW in order to maintain a high performance of the muon tracking chambers as well as acceptable Level-1 trigger muon fake rates in a high luminosity environment (L = 2 × 1034 cm−2 s−1 in Run. III and later on L = 5 × 1034 cm−2 s−1 in Run IV). In order to obtain the required muon momentum resolution, the MM quadruplets need to reach a spatial resolution of about 100 μm, which translates into a stringent request on the mechanical parameters of the panel. SM1 and SM2 make the small wedge, while the LM1 and LM2 quadruplets make the large one

SM1 R EADOUT PANELS
C ONSTRUCTION P ROCEDURE
Dimensional Tests
Strip Alignment Tests
Functionality Tests
C ONCLUSIONS
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