Abstract
The Large Hadron Collider (LHC) and its multi-purpose Detector, ATLAS, has been operated successfully at record centre-of-mass energies of 7 and TeV. After this successful LHC Run-1, plans are actively advancing for a series of upgrades, culminating roughly 10 years from now in the high luminosity LHC (HL-LHC) project, delivering of order five times the LHC nominal instantaneous luminosity along with luminosity leveling. The final goal is to extend the data set from ab increase, the ATLAS detector needs to be upgraded. The upgrade will proceed in two steps: Phase I in the LHC shutdown 2018/19 and Phase II in 2023-25. The largest of the ATLAS Phase-1 upgrades concerns the replacement of the first muon station of the high- rapidity region, the so called New Small Wheel. This configuration copes with the highest rates expected in Phase II and considerably enhances the performance of the forward muon system by adding triggering functionality to the first muon station. Prospects for the ongoing and future data taking are presented. This article presents the main muon physics results from LHC Run-1 based on a total luminosity of 30 fb^-1. Prospects for the ongoing and future data taking are also presented. We will conclude with an update of the status of the project and the steps towards a complete operational system, ready to be installed in ATLAS in 2018/19.
Highlights
After the first successful years of Large Hadron Collider (LHC) [1] running, plans are actively advancing for a series of upgrades leading eventually to about five times the design-luminosity some 10-years which will allow the reach of the physics program to be significantly extended
In order to benefit from the expected high luminosity LHC (HL-LHC) performance that will be provided by the Phase-I upgraded LHC, ATLAS proposes to replace the present muon SW with the New Small Wheel (NSW)
The NSW is a set of precision tracking (MMs) and trigger detectors able to work at high rates with excellent realtime spatial and time resolution
Summary
After the first successful years of LHC [1] running, plans are actively advancing for a series of upgrades leading eventually to about five times the design-luminosity some 10-years which will allow the reach of the physics program to be significantly extended. In order to take advantage of the improved LHC operation the ATLAS detector will require upgrades for this HLLHC program, to maintain its capabilities at the planned instantaneous luminosity, which corresponds to an a average of 140 interactions per crossing. The ATLAS upgrades phases for HL-LHC are described in the Letter of Intent [3, 4]. The importance of these upgrades to various physics cases are discussed in [5].
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