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Analysis of Random Trigger Data for HEC: Insights from 2010 Dataset

This study presents an analysis of random trigger data from the HEC using a dataset acquired in 2010 (data10_7TeV.00155569.physics_RNDM.recon.ESD.f260). The focus is on identifying "good" cells by examining the energy distribution in comparison to the average within corresponding η-rings. The analysis involved accumulating energy data for HEC cells from a total of ~256,652 events across 450 files, applying Gaussian fits to histograms of energy values, and identifying problematic channels based on statistical criteria. Results indicate significant insights into channel performance.

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Analysis of Random Trigger Data for HEC: Insights from 2010 Dataset

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  1. Namig Javadov JINR (Dubna) Analysis of Random Trigger Data 2010 for HEC (data10_7TeV.00155569.physics_RNDM.recon.ESD.f260)

  2. 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

  3. 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.

  4. 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.

  5. 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).

  6. “Low noise” cells Ct_<NM_ring-n*Nσ_ring

  7. 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).

  8. 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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