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Operational Experience, Improvements, and Performance of the CDF Run II Silicon Vertex Detector

Operational Experience, Improvements, and Performance of the CDF Run II Silicon Vertex Detector. Authors CDF Silicon Who-is-who! (55 of them). Editor-Authors Ankush , Benedetto, Kyle, Marcel, Mark, Michelle, Sasha, Satyajit, Sergo and Tom. Paper seminar CDF weekly meeting, 08/23/2012.

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Operational Experience, Improvements, and Performance of the CDF Run II Silicon Vertex Detector

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  1. Operational Experience, Improvements, andPerformance of the CDF Run II Silicon Vertex Detector Authors CDF Silicon Who-is-who! (55 of them) Editor-Authors Ankush, Benedetto, Kyle, Marcel, Mark, Michelle, Sasha, Satyajit, Sergo and Tom Paper seminar CDF weekly meeting, 08/23/2012 GP-Authors Gino Bolla, Selchuk Cihangir, Doug Glenzinski, David Stuart, Jeff Spalding and Rainer Wallny

  2. Objective of the Paper • Serve as a final and authentic statement about the operations and performance of the CDF Run II silicon detector. • Put to rest any intermediate and/or debatable information presented in conference proceedings etc. • Emphasize on information, e.g. radiation aging and physics performance, that is of major interest to the HEP detector community. • Address the long standing question: Why this detector performed so well beyond its design? • Give an as-complete-as-possible account of the operational challenges and mitigation techniques involved in running a complex silicon detector. A. Mitra, SiOps NIM paper seminar

  3. Organization • Introduction • Detector Description • Data Acquisition System • Power Supplies • Cooling System • Particle Beam Incidents and Monitoring • Sensor Readout Calibration • Detector Monitoring and Operations Support • Monitoring Radiation Damage Effects • Physics Performance • Summary A. Mitra, SiOps NIM paper seminar

  4. The Split Rad Damage (14%) Cooling (17%) A. Mitra, SiOps NIM paper seminar

  5. General Layout • Introduction • CDF detector: home to the silicon detectors • Role of silicon detectors in CDF physics program • Sections on individual components • Describe important design parameters • Describe the operational challenges and measures adopted to solve or mitigate them • Present performance plots / numbers / tables • Summary • Compile important aspects of the operations and the lessons learnt • Some statements on how the future experiments could benefit from the experience A. Mitra, SiOps NIM paper seminar

  6. The Main Message We ran very well! A. Mitra, SiOps NIM paper seminar

  7. Silicon DAQ • A very complex system • SVX3D, DOIMs, SRC, FIB, VRB … • Several failure modes addressed • SVX3D operations (keep-alive …) • Resonances Wirebond failures Remedy: Ghostbuster • L00 noise • Massive trips • Several sources of bit errors • FIB SEUs from radiation • Enhancements • Two SRCs • Load balancing A. Mitra, SiOps NIM paper seminar

  8. The Dreaded CAENs! • Operational nightmare • Dropping LVs (bad regulator caps) • Lack of spares • CAEN repair/transportation • Fermilab ESE dept. to rescue • Majority of supplies repaired during 2007, 2009 shutdowns • Many thanks to Vince Pavlicek and Hank Connor! Droopy LV fixed! Accelerometer A. Mitra, SiOps NIM paper seminar

  9. Cooling System • A very complex system SVX/L00 ISL • Cooling load: 5 kW4 kW • Chiller: -10 oC +6 oC • Coolant: 30:70 100 EthGly:Water Water • Sub-atmospheric pressure • Operational nightmare • Blocked ISL cooling line • ISL coolant turned acidic  corrosion, leaks • Unprecedented brave effort: Repair using lasers, catheters, borescopes … A. Mitra, SiOps NIM paper seminar

  10. Radiation Damage (Vdep Evolution) L00 Sensor breakdown region SVX-L0

  11. Radiation Damage (Vdep Evolution) L00 • Ladders showed expected inversion behavior as Run II progressed • At the end of Run II • Majority of L00 ladders were fully depleted • About 30% SVX-L0 ladders were below full depletion due to being in the sensor breakdown region Sensor breakdown region SVX-L0

  12. Radiation Damage (Double-Junction) • Before irradiation (upper) n-side signal grows with Vbias above p-side full depletion. • After irradiation (lower) we measure n-side signal below p-side full depletion. • This is consistent with a Double-Junction electric field being present in the sensor after irradiation. r-z r-φ 0.3 fb-1 6.9 fb-1 A. Mitra, SiOps NIM paper seminar

  13. Radiation Damage (S/N Evolution) r-φ r-z • S/N performed much better than expected • No tracking degradation observed along the way A. Mitra, SiOps NIM paper seminar

  14. Operational Enhancements (on Steroid) • Silicon Auto-Recovery (SAR) + Auto-Hocker • Unassisted post-SEU recovery from CAEN crate reset followed by SVX3D chips reconfiguration • Significantly reduced downtime • Improved/redesigned loadbox for CAEN PS testing • Minimized collision hall access time A. Mitra, SiOps NIM paper seminar

  15. Performance • Physics performance with silicon • Impact parameter resolution • b-tagging efficiency and mistag rate w.r.t jet ET and eta. • SVT efficiency extrapolation from 3 fb-1 to 8 fb-1 L3 SVT/L3 fiducial L3 SVT/L3 fiducial with >=4 r-φ hits A. Mitra, SiOps NIM paper seminar

  16. Timeline of the Paper • 08/27/2012: NIM submission • 08/23/2012: Paper seminar  Today • 07/23/2012: Third draft • 05/16/2012: Countdown to NIM submission • 09/20/2011: Second draft  1 year ago • 01/21/2011: First draft • 03/10/2010: Authors’ review with complete draft • 08/08/2009: Paper writing kick-off  3 years ago A. Mitra, SiOps NIM paper seminar

  17. Why did it take us so long?! • This is an information-laden document derived from many documents published over the past 11 years. It is not easy to fit them together into a single publication with a good logical flow. • Several studies presented here evolved/improved over the past 3 years. They had to be incorporated into the draft along the way. • A good fraction of the editors were SPLs, MPCs, ACEs, OpsHead, OpsMan etc. up to Sep. 2011 … and then some morphed into Higgs hunters. • Editors / contributors graduated and/or moved away from CDF. • The fine print: We had our share of laziness too! A. Mitra, SiOps NIM paper seminar

  18. BIG THANKS TO… • The (now exiled) silicon coffee machine • The CDF Operations management • OpsHeads, OpsMen, Dee, … • The Spokespeople • Logistics, SPLs, MPCs and $$ • The GPs • Responding on a very tight schedule • All document contributors • Miguel, Roberto, Tino, SCarron, Ricardo, Ignacio, Oscar, MMathis, Ron and Jason • And many more who built, commissioned and ran this magnificent detector … including A. Mitra, SiOps NIM paper seminar

  19. … our Main Pager Carriers! A. Mitra, SiOps NIM paper seminar

  20. Summary • The drafts and GP webpage is at: • http://www-cdfonline.fnal.gov/svx/OpsNIM/ • After a long internal scrutiny by many experts a draft is ready for submission to NIM A, after a 48 hours waiting period. • We plan to follow up our radiation aging study with a more detailed and dedicated paper in future including results from studies using the annealing data we took for a month after the Run II final shutdown. A. Mitra, SiOps NIM paper seminar

  21. BACKUP SLIDES A. Mitra, SiOps NIM paper seminar

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