r&d for the atlas semiconducting tracker upgrade: cern single module system adryanna smith...
TRANSCRIPT
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R&D FOR THE ATLAS SEMICONDUCTING TRACKER UPGRADE:
CERN SINGLE MODULE SYSTEM
ADRYANNA SMITHBAYLOR UNIVERSITY
DUKE/TUNL REU 2015
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OUTLINE• Purpose for traveling to
CERN
• Tasks at the lab
• Single module tests
• ttbarV analysis
Saint Genis-Pouilly, France
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WHY WE WERE SENT TO CERN• CERN experiments demand enormous collaborations
• Characterizations and documentation of detector components, performed by many institutions
• Duke is a primary source of manpower for SCT upgrade
• Knowledge gained at Duke -> Knowledge helping with CERN setup -> Knowledge for future Duke setup
Atlas Detector Controls
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THE ASSIGNMENT
• Relocation of electronics and DAQ system to new building
• Re-commissioning of the new location
• Lots of wires• Lots of power
supplies• Lots of boards• Lots of
troubleshooting
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THE NEW LOCATION
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THE SINGLE MODULE
Stream 1Stream 0
Stream 0Stream 1
Hybrid 0
Hybrid 1
One Module
Power Supplies and Interlock
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TESTS • iDelay, Strobe Delay, Trim Range,
3 Point Gain, etc.
• 3 Point Gain
• Send in 3 levels of charge pulse: 0.52, 1.00, 1.48 fC
• Pulse comes in… hit registers in a % of channels, depending on the threshold
• Variance in threshold distribution “Noise” reading
Occupancy vs. Threshold
V50
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8*Result: Higher temperature -> higher noise
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9*Result: Higher HV bias -> lower noise, to an extent
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FUTURE OF THE UPGRADE @ CERN• Will likely move stations again within SR1
• CO2 lines for cooling stavelets
• Atlys board will replace HSIO board
• Connect stavelets and run tests
• Document the setup and test results
• Other institutions (such as Duke) can replicate our work• Nascent Twiki page
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V ANALYSISttbar
V = Vector Boson (Spin 1, force carrier)
• Duke graduate student Chen Zhou’s analysis: Same Sign Dilepton Decays• Interested in looking at Triplepton (3L) Decays using AIDA technique
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A CLOSER LOOK• Uses √s = 8 TeV data from ATLAS detector
• These cross sections investigate top-EW coupling
• ttbarZ is particularly interesting
• Similar to ttbarH decay channel• Studying cross section of Higgs interactions is hot topic
• 2 Major Trilepton Regions:
• Make further cuts based on ET, isolation (tight/loose), and jets
3L-Z3L-noZ
e-e+ μ- μ+the lepton options
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ANALYSIS UPDATE• Lots of code to decipher
• Lots of terms to decipher
• SCT upgrade work, background reading, and lectures kept us engaged
• Beginning to make progress… but in the end, the summer ran out
ssh -Y [email protected]
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ACKNOWLEDGEMENTS
Thanks goes to Mark Kruse and Ayana Arce for acting as our advisors. A keen gratitude also towards Chen Zhou for his mentorship at CERN. And of course, the other undergrads, Chloe Lindeman, Bolaji Eniwaye, Shelby Burant, and Matt Tobin!
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SOURCES• Carlos Garcia Argos (2012), Valencia University
• Procedure for Operating the HSIO DAQ System for Single Modules in the B180 Setup
• Chen Zhou, et al. (2015), ATLAS Paper
• Measurement of the ttbarW and ttbarZ production cross sections in pp collisions at √s = 8 TeV with the ATLAS detector
• Chen Zhou (2015), ATLAS AIDA Group Poster
• Measurements of the ttbarW/Z production cross sections using events with same-sign leptons from pp collisions at √s = 8 TeV with the ATLAS detector
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DEEP BURNING QUESTIONS??• You may now ask me and Chloe questions
• FAQ
• When did you both first learn that you were spectacular?• From a young age.
• Is physics good for anything?• It’s not bad for anything and its study has yet to be linked
to cancer (radiation), obesity (#desklife), or deforestation (problem sets).
• How can CP Violation be resolved?• Use a small enough wavelength and you can resolve
almost anything.
• Where is CERN?• In an expensive land, far, far away from Taco Bell.