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NA61 – 2009 data taking

NA61 – 2009 data taking. A. Marchionni , ETHZ. 2009 data taking detector upgrades TPC readout electronics, new trigger system FPGA based, larger size BPDs, extension of the Forward TOF thin target data taking from August 13 to August 25 morning

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NA61 – 2009 data taking

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  1. NA61 – 2009 data taking A. Marchionni, ETHZ • 2009 data taking • detector upgrades • TPC readout electronics, new trigger system FPGA based, larger size BPDs, extension of the Forward TOF • thin target data taking from August 13 to August 25 morning • long target data taking: from August 25 evening to September 3 • morning

  2. Thin target data taking Triggers and prescaling factors            Trigger-1 (T1) :   beam trigger   (S1*S2*Vbar*Cbar*CED)Trigger-2 (T2) :   interaction trigger   (T1*S4bar)            Trigger-3 (T3) :   interaction trigger without veto counters            Trigger-4 (T4) :   interaction w/o beam-PID trigger (S1*S2*Vbar*S4bar)             T1/T2 = 15%                       T3/T2 = 2%             T4/T2 = 5% Multiple triggers running in parallel with the new trigger system T2/Beam Target IN: 7.01% T2/Beam Target OUT: 1.64% 2007 T2/Beam Target (IN-OUT): (5.36±0.01)%

  3. Accumulated statistics ~5.5M events, corresponding to 4.4M interaction triggers In addition, taken ~100K events target holder data

  4. Beam Profiles Preliminary ~20% less efficiency than in 2007 with very preliminary alignment and thresholds Boris Popov

  5. Preliminary ~5 points less on average than 2007 due to TPC noise Boris Popov

  6. TOF Preliminary Boris Popov

  7. dE/dx distributions Preliminary Boris Popov

  8. Kinematical distributions Preliminary Boris Popov

  9. Beam momentum 2007 2009 Preliminary Boris Popov

  10. Long target data taking ~3.5M events, corresponding to >2.5M beam particles hitting the long target Triggers T1 :   beam trigger   S1*S2*V1pbar*Cbar*CED 21.6% T2 :  beam trigger (outer target ring) S1*S2*V1pbar*Cbar*CED*S3 30.9% T3 :   beam trigger (core of target) S1*S2*V1pbar*V0bar*Cbar*CED*S3 35.6%T4 :   beam trigger – no PID S1*S2*V1pbar*S3 11.8%

  11. 2009 Long Target event Jeremy Argyriades

  12. Conclusions • 2009 data taking • thin target: 4.4M interaction triggers • long target: >2.5M beam particles hitting the target • Preliminary look at thin target 2009 data • data quality look OK • accumulated statistics seems OK

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