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Namig Javadov JINR (Dubna ). Analysis of Random Trigger Data 2010 for HEC ( data10_7TeV.00155569.physics_RNDM.recon.ESD.f260 ). Method was already presented at the ECAL meeting.

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Analysis of Random Trigger Data 2010 for HEC

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Analysis of random trigger data 2010 for hec

Namig Javadov

JINR (Dubna)

Analysis of Random Trigger Data 2010 for HEC

(data10_7TeV.00155569.physics_RNDM.recon.ESD.f260)


Analysis of random trigger data 2010 for hec

Method was already presented at the ECAL meeting.

(http://indico.cern.ch/conferenceDisplay.py?confId=68351, http://indico.cern.ch/conferenceDisplay.py?confId=72237)

The idea was to have a look at the “good” cells by checking how much the energy distribution in the particular cell is different from the average value in the corresponding η-ring in which the cells are identical .

  • Dataset used in the analysis:

  • data10_7TeV.00155569.physics_RNDM.recon.ESD.f260….

  • Athena 15.6.9

  • Total 450 files

  • Total number of events: ~256652

  • - The energy for every HEC cell was accumulated in the histogram

  • All histograms, each containing ~25 lb, were fitted by the Gaussian

  • The Mean and Sigma values for each cell were used in the analysis


Analysis of random trigger data 2010 for hec

Mean and Sigma values for each “good” cells (i.e. not in the unhappychannels” list from 08.05.10 + 4 new) for the same η-value (ring–region), were put in histograms and then fitted. The fit results were used for selection of the “problematic” channels.

One ring

One cell

25 lb

Mm_ring

Mσ_ring

Mean

One ring

One cell

Total events

Ct_M

Ct_σ

NM_ring

Nσ_ring

Noise

Example the cell and the ring-region with no problems.


Analysis of random trigger data 2010 for hec

Cell pedestal shift in the run relative to averaged over η-region( ±nϬ_ring )

Cell pedestal shift vs region pedestal average

|C_mean | > M_ring±3MϬ_ring

The shown is pedestal drift with lb.


Analysis of random trigger data 2010 for hec

Ratio of cell noise to the ring average

Ct_Ϭ /NM_ring

The ratio (Ct_Ϭ /NM_ring) is more than 2.0

9 such cells were spotted in December’09 (RNDM run 140571), 7 of them are shown in red and two are now in the unhappychannel list (LowNoiseHG).


Analysis of random trigger data 2010 for hec

“Low noise” cells

Ct_<NM_ring-n*Nσ_ring


Analysis of random trigger data 2010 for hec

RNDM run 140571 (December’09)

“Low noise” cells

Ct_<NM_ring-n*Nσ_ring

Since the December’09 3 cells are “unhappy” and 2 remain

stable (are in previous Table).


Analysis of random trigger data 2010 for hec

Conclusion

Some “problematic” channels have been observed and tabulated in run 00155569.physics_RNDM .

The results are compared with the December’09 run

00140571.physics_RNDM


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