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EEMC Calibration in 2004

This document details the calibration process using fast detectors, absolute gains for SMD and towers, and the HV setup scheme for 2005. It explains the methodology, MIP response, gain corrections, and calibration of pre/post-shower components in sectors 5-8. The efforts aim to achieve accurate energy deposition measurements in the EEMC.

williamhaynes
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EEMC Calibration in 2004

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  1. EEMC Calibration in 2004 • MIP signature w/ SMD • Absolute gains for SMD, pre/post-shower, towers • HV setup scheme for 2005 running Jan Balewski, IUCF Joint EMC Meeting December 3, 2004

  2. Why calibration with fast detectors only ? 6-Fold Response of EEMC Pre Shower P Q Shower Max U V Post Shower R =2.0 bin=1 PROJECTIVE TOWER ( T ) =1.08 bin=12 Endcap STAR IP No tracking Endcap No tracking

  3. METHOD: MIPs from Isolated Pairs of SMD Strips Sector 5 MIP’s from UxV N U-plane Strip ID N V-plane Strip ID Murad Sarsour +JB, IUCF SMD cross section U & V planes are orthogonal in each sector vertex Slopes used to relative gain match of strips

  4. Absolute SMD Calibration 0= 1.3 MeV MIP  vertex MIP spectrum for 20 strip pairs MPV of Landau fit y 1.3 MeV Pair energy E1+2 z • Units are average energy deposit of MIP going perpendicular through the SMD plain • constrain on gains: Gain Correction (slopes used as input) 1.3 MeV Strip ID

  5. Distribution of SMD gains HV change will reduce spread to some extent

  6. Absolute Pre/Post-shower Calibration y z MIP spectrum for tile 05PA06 • Units are energy deposit of MIP going perpendicular through tile • Formula for gains from Landau fit • to MIP peak • reco of actual energy deposit in a tile • reco of energy equivalent to MIP perp to tile MPV of Landau fit a any particle: charge track,,  0= a *d/dxMIP  E()= 0 / tgh()   only charge track vertex

  7. Pre/Post-shower absolute gains Preshower 2 Sector 5 M P V of MIP Gains from slopes (a.u.)

  8. Absolute Calibration of Towers (sectors 5-8) • use 6 ‘o’ in ooxxoo or ooxoo in UxV patterns (veto ~2 x 4cm ) • require pres1, pres2, post > thres= ped+5chan Eta bin 6 Tower 07TD7 Eta bin 5 Raw spectrum (1.5 M eve) Gains from MIPs w/ SMD Eta bin 9 Eta bin 8 MIP spectrum (280 eve) Eta bin 11 Eta bin 12 Gains from MIPs w/ TPC (P. Zolnierczuk)

  9. Tower gains summary sectors 5-8 Goal +/- 10% ET=60 GeV @ ADC=4095

  10. Tower gains for sectors 1-4 and 9-12 • No SMD installed in 2004 • use slopes • absolute (eta dependent) scale from calibrated sect. 5-8 • use only runs with slow detectors (less corruption)

  11. Murad & Jan want to thank: • Dave – produce ezTree for bulk of pp200 data • Iwona, Ernst – disk space @ LBL & assistance

  12. Summary for 2004 data • EEMC is calibrated for 2004 data • MIP’s define gains for individual towers in sectors 5-8 and all pre/post-shower tiles • Slopes define relative gains for individual towers in sectors 1-4, 9-12 and all SMD strips. • Absolute scale for all EEMC set by MIP’s pi0’s will be used to set the final energy scale for towers, once available, perhaps 10-20% change

  13. HV setup scheme for 2005 running • Towers: • Find average gain per eta bin • Change HV for outliers above 10% • Use slopes to confirm relative gains SMD, Pre, Post-shower: - Equalize MAPMT’s 2-3M minB (fast detector only) events is enough to repeat MIP calib for all elements Perhaps not needed?

  14. Backup

  15. MIP gains vs. AuAu62 slops, SMD

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