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ICD/MG Detectors

ICD/MG Detectors. Reweighting the ICD response First look at Muons. Some news on the ICD detector. Bob Kehoe noticed that the L1 CAL towers that include mainly ICD towers report much more energy than the precision readout I noticed the following:. Response. ICD Fraction.

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ICD/MG Detectors

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  1. ICD/MG Detectors • Reweighting the ICD response • First look at Muons Vivian O’Dell, Fermilab

  2. Some news on the ICD detector • Bob Kehoe noticed that the L1 CAL towers that include mainly ICD towers report much more energy than the precision readout • I noticed the following: Response ICD Fraction Vivian O’Dell, Fermilab

  3. Response in MG Detectors: MonteCarlo ICD ECMG Response Monte Carlo predicts response Vs. fraction should be flat CCMG Fraction (0.0 - 1.0) Vivian O’Dell, Fermilab

  4. Response in MG Detectors: Data ICD ECMG Response Both ICD and CCMG look low to me. CCMG Fraction (0.0 - 1.0) Vivian O’Dell, Fermilab

  5. ICD reweighting? • Calibration of the ICD was done on a test stand using sources for MIP peaks • The test stand used Calorimeter preamps because they have higher gains and made calibration of small signals easy • In going from ADC counts to energy the difference of the calorimeter preamps/ICD preamps used in the detector was taken out • This factor was 3.8 - measured on the test stand • The ICD readout is really lower by 3.8 because of the lower gain preamps - which means this factor needs to go back in. • If all this confuses you, it’s because I don’t understand it either Vivian O’Dell, Fermilab

  6. Response ICD Fraction ICD reweighting? • I put this factor of 3.8 in a crude way into the response/fraction calculations and get: Vivian O’Dell, Fermilab

  7. Data/Monte Carlo Correction Effect With ICD Correction Without ICD Correction Vivian O’Dell, Fermilab

  8. Looking At Muons • It would be nice to find MIP peaks in the MG detectors to see where they are in the data • For each good Muon object, make a linear extrapolation from the vertex to A Layer • Then I look at Delta Eta, Delta Phi between Muon extrapolation and Cal Cells All Cells Closest Cell in dEta, dPhi Delta Eta between Muon Object and ICD Cell Cut at +- 0.2 Vivian O’Dell, Fermilab

  9. Looking At Muons Layer 7 (EM Layer 4) CC MG EC MG ICD Vivian O’Dell, Fermilab

  10. Energy in Closest Cells Energy in ICD Energy in an ICD Cell Energy in closest ICD cell ICD Energy in closest - energy in random cell ‘Peak’ at ~200 MeV? Vivian O’Dell, Fermilab

  11. Energy in Closest Cells Energy in CCMG Energy in an CCMG Cell Energy in closest CCMG cell ‘Peak’ at ~150 MeV? CCMG Energy in closest cell - energy in random cell Vivian O’Dell, Fermilab

  12. Energy in Closest Cells Energy in ECMG Energy in an ECMG Cell Energy in closest ECMG cell ‘Peak’ at ~150 MeV? ECMG Energy in closest cell - energy in random cell Vivian O’Dell, Fermilab

  13. Energy in Closest Cells Energy in Layer 7 Energy in an L7 Cell Energy in closest L7 cell ‘Peak’ at ~75 MeV? L7 Energy in closest cell - energy in random cell Vivian O’Dell, Fermilab

  14. ICD next step • ICD also has channel to channel variation of MIP peaks as seen on the test stand - I would like to reproduce this with muon data - but clearly this will take a lot of data • If we need channel - to - channel variations of calibration in reco, this is a non-trivial change to the calorimeter software framework • Would like to get the factor of 3.8 into the next reco version and see how that helps • Would like to understand CC & EC MG detectors better as well Vivian O’Dell, Fermilab

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