1. 24/03/2010ALICE TOF General Meeting March 20101 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

2. 24/03/2010ALICE TOF General Meeting March 20102 Outline Overview of TOF hardware status 2010 data taking

3. 24/03/2010ALICE TOF General Meeting March 20103 TotalGoodGood (%) Crate Power Suppy726995.8 TDC Readout Module67264996.6 Status of VME Crate PS and FEE @ December 2009 from Scioli’s talk, TOF General meeting December ‘09

4. 24/03/2010ALICE TOF General Meeting March 20104 Status of VME Crate PS and FEE @ March 2010 TotalGoodGood (%) Crate Power Suppy727198.6 TDC Readout Module67265397.2 Seriuos incident Tuesday 16/3 at 03:55 in the UX mixed water circuit  overheating of several power supplies

5. 24/03/2010ALICE TOF General Meeting March 20105 Front End Card power supplies (+ 38% spares) Crate and Readout Card power supplies used not used broken broken after 01.01.2010 due to magnet operations sectors  Side C Side A 100% of TOF LV channels available and powered ON, only 15% of spare channels used Status of LV Power Supplies @ March 2010

6. 24/03/2010ALICE TOF General Meeting March 20106 x 180 Tripolar cables distribution box Unipolar cables CR4 L3 Magnet 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. Status of HV system @ March 2010

7. 24/03/2010ALICE TOF General Meeting March 20107 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. TOF Hardware Summary

8. 24/03/2010ALICE TOF General Meeting March 20108 2010 data taking

9. 24/03/2010ALICE TOF General Meeting March 20109 LHC 2010 milestones 22 th February: LHC Restart 19 th March: two circulating proton beams @ 3.5 TeV 27 th March: minimal data set (100000 events) pp collisions @ 900 GeV 30 th March: first attempt for pp collisions @ 7 TeV

10. 24/03/2010ALICE TOF General Meeting March 201010 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.

11. 24/03/2010ALICE TOF General Meeting March 201011 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% Present (Official) planning for 2010

12. 24/03/2010ALICE TOF General Meeting March 201012 Most reliable scenario Ion beam to SPS Ion beam setup

13. 24/03/2010ALICE TOF General Meeting March 201013 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

14. 24/03/2010ALICE TOF General Meeting March 201014 backup

15. 24/03/2010ALICE TOF General Meeting March 201015  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 From 27 th ALICE DCS Workshop, CERN 22 March 2010 (André Augustinus presentation):  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

16. 24/03/2010ALICE TOF General Meeting March 201016 Rack I32 (TOF) The Central DCS saw a rise in temperature for TOF racks but not enough to trigger the hardware interlock…

17. 24/03/2010ALICE TOF General Meeting March 201017 TOF: 227 runs for 223 hours