2012 RPC calibration HV scan Pigi Paolucci Marcello

2012 RPC calibration (HV scan) Pigi Paolucci Marcello Abbrescia Juan Pablo Gomez Camilo Carrillo Davide Piccolo HV scan team - XEB meeting 7 May 1 07/05/12

Introduction • 2012 HV scan calibration was about 12 hours long • 2011 was a week long • 3 runs: 190661, 190663 and 190678 • 8 HV points in barrel • 11 HV points in endcap • Lumi with bad RPC: 13. 2 pb-1 • One more calibration at the end of 2012 HV scan team - XEB meeting 7 May 2 07/05/12

Few Plateau examples 42 not well characterized rolls 2085 well characterized rolls 96% of the total RE 3 shifted 100 Volt HV scan team - XEB meeting 7 May 47 off rolls 3 07/05/12

Average Plateau 2012 -2011 Barrel Endcap 2011 barrel 2012 barrel 2011 endcap 2012 endcap HV scan team - XEB meeting 7 May 4 07/05/12

Sigmoid Fit • Very good fit as it was in the 2011 • No difference between barrel and endcap 2012 HV scan team - XEB meeting 7 May 5 07/05/12

HV point at 50% of the efficiency 2011 2012 barrel endcap • HV 50 is a very powerfull variable to spot aging affect. • None today after about 7 years of first chamber operation HV scan team - XEB meeting 7 May 6 07/05/12

HV 50 distributions per disk + barrel HV scan team - XEB meeting 7 May 7 07/05/12

Efficiency. vs. HV offset HV scan team - XEB meeting 7 May 8 07/05/12

Efficiency at WP (disk + barrel) HV scan team - XEB meeting 7 May 9 07/05/12