Jin Huang M.I.T. For Transversity Analysis Meeting Sept 10, JLab

Transversity Analysis Meeting Jin Huang 2

 On BigBite side, normal Coinc Timing using track information to ◦ Selecting Scintillator Hit ◦ Calculating Path length correction  Tracking-Free Coinc Timing needed for ◦ Study no-track events (a lot) ◦ Study photon-like event on BigBite and its asym.  Calculated by ◦ Matching Largest Total Shower hit to Scintillator hits ◦ Calculating Path length base on shower/scint hit position Transversity Analysis Meeting Jin Huang 3

 With Pion PID Cut on HRS  No Cut on BigBite Side  Background Higher : 2ns period pulse Transversity Analysis Meeting Jin Huang 4

 With Proton PID Cut on HRS  No Cut on BigBite Side  Proton Peak Aligned to 0ns Transversity Analysis Meeting Jin Huang 5

 Fit of TF CT VS good production/ref cell Run  10% of run replayed  Stable Cross Running period Transversity Analysis Meeting Jin Huang 6 HRS Retiming Problem

Transversity Analysis Meeting Jin Huang 7 Matched PS/Sh Cluster All 0 Track Events Matched PS/Sh Cluster All 0 Track Events Event With valid TF CT Events with Cluster Event With valid TF CT Events with Cluster

Transversity Analysis Meeting Jin Huang 8

 Scintillator are used to calculate CTs  Its data quality never checked  Although CT is shown to be stable Double check CT could unveil microscopic problems  Checked with Production 3 / Skimmed Root Files, All runs ◦ All ADC/TDC mean value/RMS vs runs ◦ Track Timing Matching Efficiency Transversity Analysis Meeting Jin Huang 9

 L1A Problems ◦ Solved  Drop~10chan for all period ◦ Why?  Left PMT #4 ADC break from ◦ Should be little effect to CT Transversity Analysis Meeting Jin Huang 10

Transversity Analysis Meeting Jin Huang 11

 TDC checked with T5 Cut ◦ Retiming Problems Solved  Matching Efficiency to Track ◦ Low Eff During Retiming Problem Period ◦ Seeing two L1A problem Period Transversity Analysis Meeting Jin Huang 12

Transversity Analysis Meeting Jin Huang 13

Transversity Analysis Meeting Jin Huang 14

Transversity Analysis Meeting Jin Huang 15

 Low ADC during Retiming Problem Period?  HV Change in Jan (Recalibrated in DB)  Bar 10 loose cable,  Random Gain Drop Around 5450? ◦ Most run with low statistic Transversity Analysis Meeting Jin Huang 16

Transversity Analysis Meeting Jin Huang 17

Transversity Analysis Meeting Jin Huang 18

 TDC is stable ◦ Two Timing Adjustment, Automatically taken care of during CT calculation  Matching Eff. To Tracks ◦ Low Matching Eff. at beginning of running? ◦ 0 Hit Effeciency ~ 5640 : F1 TDC DMA transfer terminated by unknown BUS Error ve/ html ve/ html Transversity Analysis Meeting Jin Huang 19

Transversity Analysis Meeting Jin Huang 20

Transversity Analysis Meeting Jin Huang 21

 Scintillator is generally stable  Few problems listed above  Double check again after pass 4 Transversity Analysis Meeting Jin Huang 22

Transversity Analysis Meeting Jin Huang 23

Transversity Analysis Meeting Jin Huang 24

Transversity Analysis Meeting Jin Huang 25

Transversity Analysis Meeting Jin Huang 26

Transversity Analysis Meeting Jin Huang 27