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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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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.

(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


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.


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.


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).


“Low noise” cells

Ct_<NM_ring-n*Nσ_ring


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).


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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