MDT Studies for PhaseII Upgrade Mitchell Kerver Advisors

MDT Studies for Phase-II Upgrade Mitchell Kerver Advisors: Verena Martinez & Kevin Black

ATLAS • One of the 2 generalpurpose detectors on the LHC • Used to investigate a range of different physics such as improving and confirming measurements of the Standard Model

ATLAS Muon Spectrometer Forms the outer layer of the ATLAS detector Contains several detector systems designed to measure momentum of muons and act as a trigger Part of the ATLAS Phase-II upgrade is replacing the readout electronics on the MDTs

Monitored Drift Tubes Muon passes through tube and ionizes gas Ions drift to charged wire and provide hit signal An algorithm uses several hits to reconstruct muon track information

My Role Studies to help design new readout electronics for MDT data Look at amount of MDT hits matched with track segments Look at the effect of timing precision on performance RPC Hits MDT Hits on Track

Track Road Width • Macro looks at number of mdt hits in a road around a track segment • Plots displayed strange behavior. Several separated clusters of RPC hits on track • Find a better ntuple to replace Muon. Calibration ntuple

Timing Resolution • Use “toy simulation” to look at segment fitting in MDT chambers • Looking at the effect the timing precision has on the spacial resolution of segment fitting • Modify simulation to read in different options from the user that will add a jitter or other corrections to the timing resolution

Timing Resolution • Initial investigation into the effect on precision is analysis of segment residuals • There is ~0. 78 ns jitter due to the discretized TDC and another ~25 ns jitter from being unsynchronized with LHC clock • Plots were generated for different amounts of timing jitter and other corrections

Future Work • Code is being documented and pushed to Github • Further studies will be done to combine both pieces of code. Segment fitter will use real data What I Learned • Coding with ROOT, C++, and Linux • How muon detectors operate • Future development for the ATLAS detector and it’s upgrades

Special thanks to the University of Michigan and National Science Foundation for making this experience possible!