ALICE-USA Barrel Tracking Upgrade (Project Final Report)

2025

USDOE Office of Science (SC), Nuclear Physics (NP), K. F. Read, Univ. of Tennessee, Knoxville, TN (United States), ALICE-USA, Thomas Michael Cormier, T. Alt, E. Anderssen, H. Appelshäuser, R. Bellwied, M. Bregant, C.L. Britton, L.G. Clonts, John P. Cunningham, N. Dianne Ezell, E. García-Solis, L. Greiner, John William Harris, H. Herrera, Peter Martin Jacobs, J. L. Klay, C. Lippmann, W. J. Llope, R. Majka, C. Markert, M. G. Munhoz, C. Nattrass, Anders Oskarsson, L. Pinsky, Mateusz Andrzej Ploskon, Jefferson Porter, C. A. Pruneau, Joern Putschke, J. Rasson, Alexandru Rusu, Joachim Schambach, Janet Elizabeth Seger, D. Silvermyr, N. Smirnov, Soren Pontoppidan Sorensen, Anthony Robert Timmins, A. Velure, S. A. Voloshin

Abstract

The ALICE-USA Barrel Tracking Upgrade (BTU) project began in 2015 to participate in a major upgrade of the Time Projection Chamber (TPC) and the Inner Tracking System (ITS) of the ALICE Experiment at CERN in Geneva, Switzerland. This upgrade increased the maximum readout rate of the ALICE detector to accommodate the increased heavy ion interaction rates following Long Shutdown 2 of the Large Hadron Collider, and greatly improved the vertexing performance of the detector. The original scope was completed and reviewed in November 2019. The BTU project document BTU.19.v1 "ALICE Barrel Tracking Upgrade Project Closeout / Transition to Operations (2019)" from November 2019 describes the status in detail and is attached as Appendix 1 below. At that point, all delivery milestones had been met on time, all Key Performance Parameters (KPPs) of the project had been satisfied, and the project was under budget. Several subsequent No Cost Extensions (NCEs) supported integration and pre-commissioning of the BTU project deliverables at CERN, as well as study and assessment of performance with Pb-Pb collisions at 50 kHz. The BTU project was successfully completed on 30 September 2024.

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