Difference between revisions of "CDC prototype drift times"
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|width="300pt"| | |width="300pt"| | ||
[[Image:trigger_spikes.png|thumb|300px|trigger times ]] | [[Image:trigger_spikes.png|thumb|300px|trigger times ]] | ||
+ | |} | ||
+ | |||
+ | <hr/> | ||
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+ | Threshold crossing bins for straw 17 and different thresholds | ||
+ | {| border="0" cellpadding="2" | ||
+ | |width="300pt"| | ||
+ | [[Image:xthr_ch17.png|thumb|300px|Threshold crossing bins for straw 17]] | ||
+ | |} | ||
+ | |||
+ | Threshold crossing bins (all straws) with 3+ and 4+ hits in the same bin | ||
+ | {| border="0" cellpadding="2" | ||
+ | |width="300pt"| | ||
+ | [[Image:xthr34_thr3.png|thumb|300px|Threshold crossing bins for multiple hits, threshold 3sigma]] | ||
+ | |} | ||
+ | |||
+ | Threshold crossing bins (all straws) with 3+ hits in the same bin | ||
+ | {| border="0" cellpadding="2" | ||
+ | |width="300pt"| | ||
+ | [[Image:xthr3_thr3.png|thumb|300px|Threshold crossing bins for 3 or more hits, threshold 3sigma]] | ||
+ | |- | ||
+ | |width="300pt"| | ||
+ | [[Image:xthr3_thr5.png|thumb|300px|Threshold crossing bins for 3 or more hits, threshold 5sigma]] | ||
+ | |- | ||
+ | |width="300pt"| | ||
+ | [[Image:xthr3_thr10.png|thumb|300px|Threshold crossing bins for 3 or more hits, threshold 10sigma]] | ||
|} | |} |
Revision as of 17:29, 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)
Threshold crossing bins for straw 17 and different thresholds
Threshold crossing bins (all straws) with 3+ and 4+ hits in the same bin
Threshold crossing bins (all straws) with 3+ hits in the same bin