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High Level Data Quality
Gracheva Katya SINP-MSU


Muon rate
· The rate of down going reconstructed muons evaluated for each Antares run in 2009.

· One should expect that in an ideal detector this rate is kept constant. On the contrary, strong fluctuations can be observed. · The aim of the work is to understand what factors affect on this rate, find quality criteria for runs and apply them on 2008-2010 data.


Procedure
· The data is reconstructed with a BBfit + online calibrations. Standart nhit>5 && tchi2<5 cuts are applied. · Muon rate should depend from: ­ detector configuration; ­ trigger type; ­ environmental conditions; ­ number of active photomultipliers (PMT). PMT is considered "active" if it gives more than 1000 hits per time slice. · The last one is rather different from run to run due to the bioluminescence. Even if during the run number of working PMTs is constant, not all the data from them is available offshore due to Xoff and HRV.


Runs grouping
· By the trigger setup
­ ­ ­ ­ ­ ­ ­ ­ 3N 3N+2T3 {Noisy channels treated} +- GC 3N+2T3+GC+TQ 3N+2T3+GC+TQ+T2 Working lines High voltage tuning Calibration (important in 2008, later not so much) Gain (normal, half gain, gain/4,gain/8)

· By detector configuration

· Special treatment of PRELIM & SCAN runs
­ Added to the normal groups which are later in time if it 's possible ­ Look run by run (in runnumber order). Usually runs in the end of a calibration period are acceptable

· GroupID format is YYGG.S ­ a float, YY ­ year {8,10}, GGgroup {1,99}, S ­ subgroup {1,} (possibly YYGG.S.S)


Example of a group
Group 1001.1.1 - 3N+2T3(+GC)


Fit and distance


2010
III I II Line reconnections

I. 14/11/2009 ­ 11/09/2010, 10 lines 3N+2T3, 1001.1, 187316 min (130 days) 1/2 gain, 1001.2, 14231 min (10 days) 1/4 gain, 1001.3, 34230 min (24 days) 1/8 gain, 1001.4, 25560 min (18 days) TQ, 1001.5, 9417 min (6,5 days) TQ+T2, 1001.6, 52216 min (36 days) L1, 1001.7, 613 min (0,5 day) 3N, 1001.8, 3435 min (2,5 days) II. 12/09/2010-27/10/2010, 9 lines TQ+T2, 1002.1, 33458 min (23 days) 3N+2T3, 1002.2, 282212 min (20 days) III.3/11/2010-01/01/2011, 12 lines TQ+T2, 1003.1, 35060 min (24 days) 3N+2T3, 1003.2, 43858 min (30 days)


Reduced gain runs


Normal gain runs


Final statistics


Conclusion
· Three years of data analysed. Data quality parameters are in DB. They may be used for effective cuts of runs for different statistic analyses. · For preliminary and problematic runs. As an additional check for future run by run simulation. · Internal note with the method will be published soon.


Thanks for attention!


· ·

1D fit of L1 hits and a given direction is performed, cut on quality is done 3D More than 5 L1 coincidences within 2.2s + causality relation for them
c/n 3N 3D + 1D scan for set of the directions, is done to reduce a background T2 2 L1 coincidences on the 2 adjustment floors within 100ns T3 2 L1 coincidences on the same floor within 100ns or 2 L1 coincidences on next to adjustment floors withing 200ns 2T3 2 pairs or L1 coincidences, any L1 hit cannot belong to 2 triggered clusters TQ Time and charge trigger GC 1D trigger with L0 hits (and one L1 hit), is done for the direction to Galactic Center K40, TS0, T0 ­ special calibration triggers. Don't act in the muon reconstruction. Dt ij d
ij

Triggers
20 ns

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