R. Boyd 1 February 2010

 Dr. M. Saleem  D. Jana  M. R. Meera Labbai  R. Boyd

 HVPP4  Reconfigurable patch panel for Pixel sensor bias distribution  Allows delaying of power supply modules until inversion sets in (>300kchf)  Designed by R. Boyd and built by the collaboration at CERN, including D. Jana and R. Labbai  All 1800 (+spares) channels were tested to 1kV  Installed in May 2008  Has provided a convenient service point for troubleshooting bias problems in the Pixel detector

 Counting Rooms Installation (organized by R. Boyd)  Power supplies for 4 * 1800 loads, in two service caverns (US15 & USA15)  DCS computers  Optical fibers  ROD (Read Out Driver) Crates  Pixel monitoring and interlocks in 4 racks in UX15 (experimental cavern)  Cables, cables, cables, cables, cables…

 Assembly in SR1 – connectivity tests  M. Saleem  Started during Pixel Detector integration in SR1, 99.8% of channels working  Repeated after installation and services connection in ATLAS  Still > 99% of channels working  Problems still arise  All the Oklahoma group has contributed to effort to understand opens in sensor bias circuits  Much shift time is spent troubleshooting and tuning unhappy channels, from various causes

 M. Saleem, R. Labbai & D. Jana contributed to DSP code validation for the Pixel Rod’s 2008  Code is validated in SR1 on ToothPix, the Pixel detector test stand  This is a continuing activity, as new code is continuously developed  Other commissioning shifts covered by OU physicists at CERN include  M5 run (data read out stream) 2007  Data quality shifts for off line monitoring 2008  ATLAS engineering run 2008

 Shifts  Category 1 – 42 required, last year, 47 covered  Category 2 -  Pixel - OU physicists  Pixel  DCS (Detector Control System)  DSP code validation  (Off-line monitoring – B. Abbot)  IDGen (Inner Detector cooling, gas, environment) R. Boyd  ID Expert shifts (6/yr.)  ATLAS (R. Boyd)  SLIMOS (Shift Leader in Matters of Safety), since 2005 (2 – 4 /mo.)  Patrol on call (securing cavern safety for beam) – 1 in training (6/yr.)

 In addition to shifts, R. Boyd  Serves as ATLAS (and Pixel) Laser Safety Officer  Documentation  Training  Coordination of laser interventions  Annual inspection and safety tests  Serves on ATLAS safety team, which meets weekly  Manages underground access and other safety issues for Pixel  Pixel DSS (Detector Safety System) responsible  Represents the Pixel detector group in ATLAS Operation Management and Counting Room Management meetings (for infrastructure)  Attends the weekly ID and CERN EN/CV cooling coordination meeting

 OU MS Engineering student L. Devareddy participated with Ohio State and Oklahoma State in a radiation test of new VCSEL’s and PIN diode’s for Pixel upgrades in 2007  OU and Okla. State have provided support for annual irradiation runs since  R. Boyd coordinating electronics effort for upgrade to ID cooling using binary coolant mixtures  Sonar used to determined ratio of mix and as a flow meter  Control signals for cooling plant  IBL (Insertable B layer)  Replacement to be inserted when radiation damage limits usefulness of Pixel b layer  Recently partnered with Okla. State Univ. to develop and deliver a temperature controlled patch panel for the opto boards, which convert electrical signals to optical (and vice versa), just outside the Pixel volume  Anticipate playing a central role in development assembly, testing and installation of IBL at CERN

 All ATLAS detectors have proven performance in recent months  OU personnel have received training in many areas in preparation for running  OU is already booked for 41 of a required 30 shifts in 2010 (Pixel shifts, only)  ID (Pixel) cooling is now running reliably, with regular maintenance (about 2 leaks per week)  Beams resume mid-month  IBL effort is under way