24/03/2010alice tof general meeting march 20101 tof hardware and data taking 2010 andrea alici museo...

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

TOF hardware and data taking 2010

Andrea AliciMuseo 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


Total Good Good (%)

Crate Power Suppy 72 69 95.8

TDC Readout Module 672 649 96.6

Status of VME Crate PS and FEE @ December 2009

from Scioli’s talk, TOF General meeting December ‘09


Status of VME Crate PS and FEE @ March 2010

Total Good Good (%)

Crate Power Suppy 72 71 98.6

TDC Readout Module 672 653 97.2

Seriuos incident Tuesday 16/3 at 03:55 in the UX mixed water circuit overheating of several power supplies


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 operationssectors

Side

CSi

de A

100% of TOF LV channels available and powered ON, only 15% of spare channels used

Status of LV Power Supplies @ March 2010


x 180

Tripolar cables

distributionbox

Unipolar cables

CR4

L3 Magnet

SM14SM00 SM01 SM02 SM03 SM04 SM05 SM06 SM07 SM08 SM09 SM10 SM11 SM13 SM15 SM16 SM17SM12

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


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


2010 data taking


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


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.


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


Most reliable scenario

Ion beam to SPS

Ion beam setup


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


backup


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 27th 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


Rack I32 (TOF)

The Central DCS saw a rise in temperature for TOF racks but not enough to trigger the hardware interlock…


TOF: 227 runs for 223 hours

24/03/2010alice tof general meeting march 20101 tof hardware and data taking 2010 andrea alici museo...

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