Difference between revisions of "CDC prototype drift times"
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[[Image:c15_thr10.png|thumb|300px|Threshold crossing bins for ch 15, threshold 10sigma]] | [[Image:c15_thr10.png|thumb|300px|Threshold crossing bins for ch 15, threshold 10sigma]] | ||
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+ | <hr/> | ||
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+ | {| border="0" cellpadding="2" | ||
+ | |+Drift times run 31724 (30degrees to horizontal, 2100V) where drift time (ns) is cdc time - trigger time + 100 and cdc time is the time extracted from the cdc signal x 8ns. | ||
+ | [[Image:run_31724_driftbumps_ch23_225bins.png|thumb|x300px|Ch23 cdc time - trigger time hit thr 5sigma timing thr 1sigma]] | ||
+ | [[Image:run_31724_driftbumps_ch20_225bins.png|thumb|x300px|Ch20 cdc time - trigger time hit thr 5sigma timing thr 1sigma]] | ||
+ | [[Image:run_31724_driftbumps_ch20_plust_225bins.png|thumb|x300px|Ch20 cdc time hit thr 5sigma timing thr 1sigma]] | ||
+ | |} | ||
+ | |||
+ | Drift times run 31757 (30degrees to horizontal, 2100V) | ||
+ | {| border="0" cellpadding="2" | ||
+ | |width="300pt"| | ||
+ | [[Image:run_31757_driftbumps_ch23_225bins.png|thumb|300px|Ch23 cdc time - trigger time hit thr 5sigma timing thr 1sigma]] | ||
+ | |width="300pt"| | ||
+ | [[Image:run_31724_driftbumps_ch20_225bins.png|thumb|300px|Ch20 cdc time - trigger time hit thr 5sigma timing thr 1sigma]] | ||
|} | |} |
Revision as of 12:21, 6 March 2012
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
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)
Threshold crossing bins for straw 17 and different thresholds (using one simple threshold as a multiple of pedestal std dev plus mean of pedestal for bins 90-190 bins, t0 is approx bin 198)
Threshold crossing bins (all straws) with multiple hits in the same bin
Threshold crossing bins for ch20 (straw 17) in coincidence with other straws in the same horizontal row, chs 22 - 20 - 19 - 15
3sigma threshold crossing bins for other straws in the same horizontal row in coincidence with ch20
5sigma threshold crossing bins for other straws in the same horizontal row in coincidence with ch20
10sigma threshold crossing bins for other straws in the same horizontal row in coincidence with ch20
Drift times run 31757 (30degrees to horizontal, 2100V)