Difference between revisions of "CDC prototype drift times"
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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 | 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=" | + | |width="400pt"| |
− | [[Image:run_31716_drifttime_columns_thr5.png|thumb| | + | [[Image:run_31716_drifttime_columns_thr5.png|thumb|400px|drift times for all tracks and tracks in single column of straws, threshold 5 sigma ]] |
|} | |} | ||
hit threshold is 10sigma over pedestal | hit threshold is 10sigma over pedestal | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |width=" | + | |width="400pt"| |
− | [[Image:run_31716_drifttime_columns_thr10.png|thumb| | + | [[Image:run_31716_drifttime_columns_thr10.png|thumb|400px|drift times for all tracks and tracks in single column of straws, threshold 10 sigma ]] |
|} | |} | ||
Below: Purple:all tracks through straw, grey: track angle 5° or more to vertical, light blue: track angle less than 5° to vertical. Hit threshold 5 sigma over pedestal | Below: Purple:all tracks through straw, grey: track angle 5° or more to vertical, light blue: track angle less than 5° to vertical. Hit threshold 5 sigma over pedestal | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |width=" | + | |width="400pt"| |
− | [[Image:run_31716_drifttime_trackangle_thr5.png|thumb| | + | [[Image:run_31716_drifttime_trackangle_thr5.png|thumb|400px|drift times for all tracks, tracks angled at 5° or more to vertical and at less than 5° to vertical, threshold 5 sigma ]] |
|} | |} | ||
Revision as of 17:11, 20 December 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 5° or more to vertical, light blue: track angle less than 5° to vertical. Hit threshold 5 sigma over pedestal
Same again just for straw 17
Fitted drift distance for straw 17, for all tracks, and tracks through all 3 straws in the same vertical column, hit threshold 5sigma (left) and 10sigma (right)
Same again with more bins
Trigger signal (derived from coinc unit)