Log entry time 11:24:32 on October 25, 2010

Entry number 336663

Followups:

• 336674 10/25/10 12:51 Hisham s2 efficiency
• 339105 11/08/10 10:05 hyde S1 right[4] HV
• 339359 11/10/10 03:07 Hisham S1 inefficiency follow up

DVCS Run 7711 Paddle s1[4] is about 3% inefficient compare x-distribution of T4 and T3 events

raised s1 HV4 from -1700 to -1730 V (s1.L.4) raised s1 HV10 from -1550 to -1580 V (s1.R.4)

Plot attached shows amplitude distribution of s1.left[4] for T3 events (s1.and.s2) with peak barely separated from pedestal T->Draw("L.s1.la[4]","D.evtypebits==8&&abs(L.tr.tg_th)<0.1&&abs(L.tr.tg_ph)<0.05&&abs(L.tr.tg_y)<0.1&&L.s1.nthit==1","") (Long64_t)159640

Second distribution are T3 events with only one paddle hit in S1 peak is at 650 T->Draw("L.s1.la[4]","D.evtypebits==8&&abs(L.tr.tg_th)<0.1&&abs(L.tr.tg_ph)<0.05&&abs(L.tr.tg_y)<0.1&&L.s1.nthit==1&&L.s1.lt[4]>0","same") (Long64_t)28010

Third distribtuion are T4 (S1.XOR.S2) events Disc threshold is at 700, above the raw peak position T->Draw("L.s1.la[4]","D.evtypebits==16&&abs(L.tr.tg_th)<0.1&&abs(L.tr.tg_ph)<0.05&&abs(L.tr.tg_y)<0.1&&L.s1.nthit==0","same") (Long64_t)1157

Figure 1