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
Method was already presented at the ECAL meeting.
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 .
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.
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
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
RNDM run 140571 (December’09)
“Low noise” cells
Since the December’09 3 cells are “unhappy” and 2 remain
stable (are in previous Table).
Some “problematic” channels have been observed and tabulated in run 00155569.physics_RNDM .
The results are compared with the December’09 run