Log entry time 06:01:18 on July 07, 2010

Entry number 330604

Followups:

• 330605 07/07/10 06:09 S.Abrahamyan ShowerPreShower calibration

After adjusting HV on Shower/PreShower using cosmics today the
calibration of total absober in good shape.
I analyzed run 1823 with all coefficients in DB set to 1.00.
Results for that are shown on Figures 1,2 and 3
Fig 1 --- Sh_E vs Ps_E 
Fig 2 --- Sh_E vs Ps_E with cut on Gas Cherenkov(select elecrons)
Fig 3 --- (1.94*Sh_E+Ps_E)/P with cut on Gas Cherenkov(select electrons)

After that I used minimization algorithm to find coefficient. Run 1823
was analyzed again with new coefficients from minimization. Results are
shown on Figures 4,5 and 6
Fig 4 --- Sh_E vs Ps_E 
Fig 5 --- Sh_E vs Ps_E with cut on Gas Cherenkov(select elecrons)
Fig 6 --- (1.94*Sh_E+Ps_E)/P with cut on Gas Cherenkov(select electrons)


Resolution with pesent HV settings with coefficients = 1.0 is 9.3%
After applying coefficients 6.8%.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6