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TOF hardware and data taking 2010 Andrea Alici

TOF hardware and data taking 2010 Andrea Alici Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Roma INFN Sezione di Bologna and CERN, Geneva. Outline. Overview of TOF hardware status 2010 data taking. Status of VME Crate PS and FEE @ December 2009.

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TOF hardware and data taking 2010 Andrea Alici

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  1. TOF hardware and data taking 2010 Andrea Alici Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Roma INFN Sezione di Bologna and CERN, Geneva ALICE TOF General Meeting March 2010

  2. Outline • Overview of TOF hardware status • 2010 data taking ALICE TOF General Meeting March 2010

  3. Status of VME Crate PS and FEE @ December 2009 from Scioli’s talk, TOF General meeting December ‘09 ALICE TOF General Meeting March 2010

  4. Status of VME Crate PS and FEE @ March 2010 Seriuos incident Tuesday 16/3 at 03:55 in the UX mixed water circuit overheating of several power supplies ALICE TOF General Meeting March 2010

  5. Status of LV Power Supplies @ March 2010 Crate and Readout Card power supplies Front End Card power supplies (+ 38% spares) Side A used not used broken broken after 01.01.2010 due to magnet operations Side C sectors  100% of TOF LV channels available and powered ON, only 15% of spare channels used ALICE TOF General Meeting March 2010

  6. SM00 SM01 SM02 SM03 SM04 SM05 SM06 SM07 SM08 SM09 SM10 SM11 SM12 SM13 SM14 SM15 SM16 SM17 Status of HV system @ March 2010 All HV channels available and powered ON, 98.4% of TOF detector is available. No more HV issues related to MRPC after 13.10.2009. x 180 CR4 L3 Magnet Tripolar cables distribution box Unipolar cables ALICE TOF General Meeting March 2010

  7. TOF Hardware Summary 93.8% of TOF detector is available, powered ON and ready for data taking (was 89.6% in December ‘09); TOF HV system seems getting a stable behavior; Hardware intervention foreseen asap to reach the 95.6% of TOF available. ALICE TOF General Meeting March 2010

  8. 2010 data taking ALICE TOF General Meeting March 2010

  9. LHC 2010 milestones • 22th February: LHC Restart • 19th March: two circulating proton beams @ 3.5 TeV • 27th March: minimal data set (100000 events) pp collisions @ 900 GeV • 30th March: first attempt for pp collisions @ 7 TeV ALICE TOF General Meeting March 2010

  10. 2010 data taking up to now No stable beam up to now in 2010. TOF has participated in 227 cosmic runs for 223 hours showing good stability. ALICE TOF General Meeting March 2010

  11. Present (Official) planning for 2010 • 2010 data taking (only): • 35 weeks of p-p collisions  280 days • 5 weeks of Pb-Pb collisions • 280 ON-CALL shifts (24h each)  47 on-call blocks  3 experts permanently @ CERN • 840 shifts (3 shifts of 8h each per day) •  140 blocks Bologna: 16 people  51.6% Salerno: 4 people  12.9% Centro Fermi: 3 people  9.7% ITEP: 4 people  12.9% Kangnung: 4 people  12.9% ALICE TOF General Meeting March 2010

  12. Most reliable scenario Ion beam to SPS Ion beam setup ALICE TOF General Meeting March 2010

  13. TOF was ready at the beginning of the cosmic data taking in August …and it continues to be ready!!! Gilda’s conclusion, TOF General Meeting December ‘09 … and it is now more and more ready ALICE TOF General Meeting March 2010

  14. backup ALICE TOF General Meeting March 2010

  15. From 27th ALICE DCS Workshop, CERN 22 March 2010 (André Augustinus presentation): • Serious incident Tuesday 16/3 at 03:55 • Automatic refill (to compensate falling pressure) of UX mixed water circuit failed due to stuck water valve • Further drop in pressure stopped the pumps • Manual refill and restart by piquet in ~1.5 hrs • Failing valve exchanged later during the day • Serious impact on ALICE equipment • Stop of SPD cooling plant (and power supplies), and later HMPID cooling plant • (Over-) heating of several power supplies • Lead to switch-off of many parts of the experiment • TOF lost 48V power supply when trying to repower them, might need to investigate with CAEN ALICE TOF General Meeting March 2010

  16. The Central DCS saw a rise in temperature for TOF racks but not enough to trigger the hardware interlock… Rack I32 (TOF) ALICE TOF General Meeting March 2010

  17. TOF: 227 runs for 223 hours ALICE TOF General Meeting March 2010

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