muon upgrade simulations status
DESCRIPTION
Muon Upgrade Simulations Status. Alexei Safonov Texas A&M University. Muon Upgrade Goals. Muon upgrades aim to achieve the following: Sustain triggering at current thresholds up to | h |=2.4 Increase offline muon identification coverage to | h |=3.5-4 - PowerPoint PPT PresentationTRANSCRIPT
Muon Upgrade Simulations Status
Alexei Safonov
Texas A&M University
Muon Upgrade Goals
Muon upgrades aim to achieve the following: Sustain triggering at
current thresholds up to |h|=2.4
Increase offline muon identification coverage to |h|=3.5-4
Maintain existing envelope by preventing or addressing aging effects
Goal of these studies: Determine what kind of
detectors we need and optimize parameters
The “baseline” scenario since ECFA
Organization and People Muon TP editing group
Editor: Jay Hauser
Contact persons: Consolidation of existing detectors:
DT: Cristina Bedoya DT
CSC: Armando Lanaro
RPC: Gabriella Pugliese
Simulation: Anna Colaleo, Alexei Safonov
New detectors: Archana Sharma, Marcello Abbrescia
Electronics: Paul Aspell
Integration into CMS and infrastructure, costing: TBD
Twiki: https://twiki.cern.ch/twiki/bin/viewauth/CMS/HLLHCmuonPhase2
Simulation Goals Goals:
Quantify physics gains for each proposed element and groups of elements
Determine optimal detector parameters
Strategy: Implement all components
Write initial algorithms and evaluate performance
Optimize parameters Resolutions required,
number of layers etc
Converge on baseline scenarios
Deliverables
Trigger (focus on Level-1): Trigger efficiency and rates for viable scenarios
For standalone Level-1 muon trigger rate versus momentum and eta
Input for itegration of standalone L1 muon with track trigger
Offline (focus on muon extension to |h|=4): ME-0 stub reconstruction efficiency and fake rate Provide “global muons” with ME-0 in CMSSW for physics
studiesME-0 + forward pixel extension track
Iterate over possible detector parameter scenarios using POG-style variable
Software Integration Status
All components are there at the level of geometries in GEANT and digis
Work focusing on algorithm development and integration with other systems, dependent on status of other detectors: E.g. forward pixel extension needs to be ready to do ME-0 studies
Muon systems in GEANT Many thanks to Yanna, Sven, Marcello, Cesare and Slava for a lot of
hard work on implementing and validating the geometries in CMSSW
Critical Tasks and Manpower: ME-0
Deliverables: Global Muons for physics studies
Muon efficiency, resolution and fake rate for a suitably optimized detector
CMSSW Geometry: Close to being fully integrated
“Digi to global” chain is in progress Simplified implementation and the overall framework: Northeastern (Nash,
Trocino, Barberis) ~ 1.2 FTE, access to experts (M. Maggi, S. Krutelyov)
Some first results available, need to iterate with a realistic forward pixel extension setup
Studies critical for obtaining realistic results: Track re-fit with muon hits included - NEU
Neutron backgrounds estimation in FLUKA – TAMU-Qatar (A. Castaneda) ~0.2 FTE
Proper segment reconstruction: a small fraction of M. Maggi (Bari)
Short-living background estimation: TBD
Optimization of segmentation and design, e.g. extra absorber between layers
ME-0 Reconstruction Status
Plots use “emulated” stubs, but formats with full implementation version are similar, should be able to switch Once done, will automatically get punch through
backgrounds simulated (in GEANT)
Framework for global track+muon fit is mostly in place More work on optimization as pixel tracking
stabilized
Need to add neutron backgrounds
D. Nash
D. Troccino
Neutron Induced Backgrounds
Able to make new geometries in FLUKA and started shielding studies Preliminary estimates look hopeful: 100 kHz/cm2 is the worst ME-0 will
see
Improvements with shielding are possible
Some questions about including hits due to to e+e- Sensitivity measurements are ongoing (shoot electrons into GEM
chambers in GEANT) – T. Maerschalk and A. Magnani
The plan is to properly convolute sensitivities and fluxes vs energy For now use “magic numbers” for photon/neutron sensitivities from
RPC
A. Castaneda
Neutron Backgrounds in Digitizer Hits from long living
backgrounds added at the digitization step Updated rates for GE-1/1 and
GE-2/1 with updated geometries (long/short) are targeted for SLHC11
SLHC10 implied a simpler geometry, but this is a small difference
ME-0 hit rates are the highest, planned to be added in SLHC11 We may need to use custom
samples in the interim to properly estimate backgrounds for ME-0
R. Hadjiiska
Critical Tasks and Manpower: GE1/1 & 2/1
Deliverables: improved trigger performance, full offline reconstruction
Reconstruction in great good shape, no outstanding issues A strong team in place – INFN-Bari, TAMU and TAMU-Qatar, Ghent, Sofia,
Egypt, Saha
Remaining studies (not on critical path):
Custom reconstruction for high pT muons (C. Calabria, Archie Sharma, A. Colaleo, S. Krutleyov) and seeding with GEMs (R. Radogna with help of experts: S. Krutelyov, D. Trocino)
More critical remaining studies: Completion of the local trigger algorithm implementation – S. Dildick, S.
Krutelyov, A. Tatarinov, T. Huang, A. Safonov
Proper integration of new features into the full muon TrackFinder - J. Lee, K. Choi (Seoul) starting to interface with Muon TF people with help from experts (S. Dildick, S. Krutelyov, A.S.)
Integration with the L1 Track Trigger – S. Krutelyov, A. Schneider (TAMU)
Trigger: Overview
Critical piece for motivation
Redundancy and bending angle improve trigger
Many technical obstacles:
New upgraded L1 TF is not easily available
Focus on making “integrated” stubs to emulate improved redundancy, trick current CSC TF into taking these stubs and evaluate the improvement
Impact of Redundancy on Trigger
Implementation of a detailed algorithm is in progress Recover CSC stubs using added
redundancy of GEMs Can even improve the high eta
part not covered by GEMs Remove soft stubs (based on
bending angle) at lower eta
Urgent, but can’t happen overnight
Work in progress
RE-3/1 and 4/1 are on even more critical path: we can provide examples, but implementation is not trivial
Need people and need time to develop expertise
Very preliminary algorithm is there, need validation and improvements. Next steps: Replicate onto YE-2/1 Run through full system
with TF (J. Lee)
T. Huang, A. Tatarinov, S. Dildick
Critical Tasks and Manpower: RE3/1, 4/1
Deliverables: Introduce RE-3/1 and 4/1 into the trigger for improved performance
Evaluate performance and detector parameters (granularity and timing)
Geometry in CMSSW and digis: P. Verwilligen, I. Osborne, M. Maggi, L. Benucci
Tasks: Evaluation of background fluxes – S. Costantini; followed by integration for
digitization (R. Hadjiska)
Proper integration of digis into the full muon TrackFinder – technical implementation has many synergies with GE-1/1 and GE-2/1
Critical to make a physics case, but there is a lot of work and debugging that needs to happen there
Dedicated performance and detector optimization studies (timing and position resolution) – likely based on dimuon triggers and signals like rare B decays to pairs of muons, background reduction studies using improved timing (G. Grenier, S. Aly, A. Abdelalim, A. Ali)
Less critical items: Inclusion of recHits into the global reconstruction, fitting etc.
Summary The work building the case for Muon system
upgrades in Technical Proposal is under way Structure, people, understanding of the deliverables,
and a realistic plan to get them delivered is in place Shortage of qualified manpower is a definite issue, we
are taking it into consideration in planning our work
Critical issues: Full implementation of new components in the trigger
Dependent on other systems, i.e. there is no easy way to use upgraded L1 muon trigger
Falling back onto old trackfinder and implementing local trigger, make better stubs and feed them to the
Once POG-like elements are largely in, need to fully focus on physics-specific studies