CMS Tracker Alignment Activities during LHC Long Shutdown 2

TL;DR

This paper details the CMS tracker alignment strategies and results during the LHC Long Shutdown 2, including initial cosmic ray and collision data alignment, to prepare for Run 3 data-taking.

Contribution

It presents the first alignment after pixel reinstallation and the alignment performance with collision data at 900 GeV, demonstrating the tracker readiness for Run 3.

Findings

Successful initial alignment with cosmic ray muons

Effective alignment with collision data at 900 GeV

Tracker readiness for LHC Run 3

Abstract

The strategies for and the performance of the CMS tracker alignment during the 2021-2022 LHC commissioning preceding the Run 3 data-taking period are described. The results of the very first tracker alignment after the pixel reinstallation, performed with cosmic ray muons recorded with the solenoid magnet off are presented. Also, the performance of the first alignment of the commissioning period with collision data events, collected at center-of-mass energy of 900 GeV, is presented. Finally, the tracker alignment effort during the final countdown to LHC Run 3 is discussed.