Download - NA61 – 2009 data taking
NA61 – 2009 data takingA. 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
Thin target data takingTriggers 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%
T2/Beam Target IN: 7.01%T2/Beam Target OUT: 1.64%
2007T2/Beam Target (IN-OUT): (5.36±0.01)%
Multiple triggers running in parallel with the new trigger system
Accumulated statistics
In addition, taken ~100K events target holder data
~5.5M events, corresponding to 4.4M interaction triggers
Beam Profiles
Preliminary
Boris Popov
~20% less efficiency than in 2007with very preliminary alignment and thresholds
Preliminary
Boris Popov
~5 points less on average than 2007due to TPC noise
TOF
Preliminary
Boris Popov
dE/dx distributions
Preliminary
Boris Popov
Kinematical distributions
Preliminary
Boris Popov
Beam momentum
Preliminary
Boris Popov
2007
2009
Long target data taking
~3.5M events, corresponding to >2.5M beam particles hitting the long target
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%
Triggers
2009 Long Target event
Jeremy Argyriades
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