Difference between revisions of "CDC prototype drift times"
From GlueXWiki
| Line 1: | Line 1: | ||
| − | |||
CDC prototype cosmics data | CDC prototype cosmics data | ||
| Line 11: | Line 10: | ||
*New timing setup (recording coinc logic signal) | *New timing setup (recording coinc logic signal) | ||
| − | Purple histogram is drift time in tracks through each straw; gray selects tracks through all 3 straws in same column | + | Purple histogram is drift time in tracks through each straw; gray selects tracks through all 3 straws in same column, hit threshold is 5sigma over pedestal |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|width="900pt"| | |width="900pt"| | ||
[[Image:run_31716_drifttime_columns_thr5.png|thumb|900px|drift times for all tracks and tracks in single column of straws, threshold 5 sigma ]] | [[Image:run_31716_drifttime_columns_thr5.png|thumb|900px|drift times for all tracks and tracks in single column of straws, threshold 5 sigma ]] | ||
|} | |} | ||
| − | + | hit threshold is 10sigma over pedestal | |
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|width="900pt"| | |width="900pt"| | ||
[[Image:run_31716_drifttime_columns_thr10.png|thumb|900px|drift times for all tracks and tracks in single column of straws, threshold 10 sigma ]] | [[Image:run_31716_drifttime_columns_thr10.png|thumb|900px|drift times for all tracks and tracks in single column of straws, threshold 10 sigma ]] | ||
| + | |} | ||
| + | |||
| + | Below: Purple:all tracks through straw, grey: track angle 5degrees or more to vertical, light blue: track angle less than 5^{o} to vertical. Hit threshold 5 sigma over pedestal | ||
| + | {| border="0" cellpadding="2" | ||
| + | |width="900pt"| | ||
| + | [[Image:run_31716_drifttime_trackangle_thr5.png|thumb|900px|drift times for all tracks, tracks angled at 5^o{} or more to vertical and at less than 5^{o} to vertical, threshold 5 sigma ]] | ||
|} | |} | ||
Revision as of 15:49, 17 November 2011
CDC prototype cosmics data
- 50/50 mixed Ar, CO2
- Recalibrated MFCs
- Outer plenum added to CDC prototype to prevent leaks
- New pre-production HVB
- 2100V
- Modified preamp4 (terminating resistors removed)
- Prototype tilted at 30o to enclosing scintillators (scints trigger the daq)
- New timing setup (recording coinc logic signal)
Purple histogram is drift time in tracks through each straw; gray selects tracks through all 3 straws in same column, hit threshold is 5sigma over pedestal
hit threshold is 10sigma over pedestal
Below: Purple:all tracks through straw, grey: track angle 5degrees or more to vertical, light blue: track angle less than 5^{o} to vertical. Hit threshold 5 sigma over pedestal
