Difference between revisions of "CDC prototype drift times"
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[[Image:cc1520.png|thumb|300px|Threshold crossing bins for chs 15 and 20, threshold 5sigma]] | [[Image:cc1520.png|thumb|300px|Threshold crossing bins for chs 15 and 20, threshold 5sigma]] | ||
+ | |} | ||
+ | |||
+ | 3sigma threshold crossing bins for other straws in the same horizontal row in coincidence with ch20 | ||
+ | {| border="0" cellpadding="2" | ||
+ | |width="300pt"| | ||
+ | [[Image:c22_thr3.png|thumb|300px|Threshold crossing bins for ch 22, threshold 3sigma]] | ||
+ | |width="300pt"| | ||
+ | [[Image:m20_thr3.png|thumb|300px|Max amplitude for ch20, threshold 3sigma]] | ||
+ | |width="300pt"| | ||
+ | [[Image:c19_thr3.png|thumb|300px|Threshold crossing bins for ch 19, threshold 3sigma]] | ||
+ | |width="300pt"| | ||
+ | [[Image:c15_thr3.png|thumb|300px|Threshold crossing bins for ch 15, threshold 3sigma]] | ||
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[[Image:c22_thr5.png|thumb|300px|Threshold crossing bins for ch 22, threshold 5sigma]] | [[Image:c22_thr5.png|thumb|300px|Threshold crossing bins for ch 22, threshold 5sigma]] | ||
|width="300pt"| | |width="300pt"| | ||
+ | [[Image:m20_thr5.png|thumb|300px|Max amplitude for ch20, threshold 5sigma, 4197 events with > 1 hit in same row (12% of >0 hits)]] | ||
|width="300pt"| | |width="300pt"| | ||
[[Image:c19_thr5.png|thumb|300px|Threshold crossing bins for ch 19, threshold 5sigma]] | [[Image:c19_thr5.png|thumb|300px|Threshold crossing bins for ch 19, threshold 5sigma]] | ||
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[[Image:c22_thr10.png|thumb|300px|Threshold crossing bins for ch 22, threshold 10sigma]] | [[Image:c22_thr10.png|thumb|300px|Threshold crossing bins for ch 22, threshold 10sigma]] | ||
|width="300pt"| | |width="300pt"| | ||
+ | [[Image:m20_thr10.png|thumb|300px|Max amplitude for ch20, threshold 10sigma, 3845 events with > 1 hit in same row (11% of >0 hits)]] | ||
|width="300pt"| | |width="300pt"| | ||
− | [[Image:c19_thr10.png|thumb|300px|Threshold crossing bins for ch | + | [[Image:c19_thr10.png|thumb|300px|Threshold crossing bins for ch 19, threshold 10sigma]] |
|width="300pt"| | |width="300pt"| | ||
− | [[Image:c15_thr10.png|thumb|300px|Threshold crossing bins for ch | + | [[Image:c15_thr10.png|thumb|300px|Threshold crossing bins for ch 15, threshold 10sigma]] |
|} | |} | ||
+ | |||
+ | <hr/> | ||
+ | |||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Drift times run 31724 (30<sup>o</sup> 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, | ||
+ | bump intervals 11, 25, 24, 28, 22, 26 (mean 22.7, 25.0 excluding 11) | ||
+ | ]] | ||
+ | |[[Image:run_31724_driftbumps_ch20_225bins.png|thumb|x300px|Ch20 cdc time - trigger time hit thr 5sigma timing thr 1sigma, bump intervals 29, | ||
+ | 21, 31, 24, 29, 30 (mean 27.3)]] | ||
+ | |[[Image:run_31724_driftbumps_ch20_plust_225bins.png|thumb|x300px|Ch20 cdc time hit thr 5sigma timing thr 1sigma, bump intervals 25, 24, 28, 19 (mean 24.0)]] | ||
+ | |} | ||
+ | |||
+ | Drift times run 31757 (horizontal, 2100V) | ||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:run_31757_driftbumps_ch23_225bins.png|thumb|x300px|Ch23 cdc time - trigger time hit thr 5sigma timing thr 1sigma, bump intervals 30, 23, 26, 25, 30 (mean 26.8)]] | ||
+ | |[[Image:run_31757_driftbumps_ch20_225bins.png|thumb|x300px|Ch20 cdc time - trigger time hit thr 5sigma timing thr 1sigma, bump intervals 24, 21, 26, 26 (mean 24.3)]] | ||
+ | |[[Image:run_31757_driftbumps_ch20_plust_225bins.png|thumb|x300px|Ch20 cdc time hit thr 5sigma timing thr 1sigma, bump intervals 15, 11, 20, 14, 17 (mean 15.4)]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Drift times run 31761 (25<sup>o</sup> 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. Before this run I disabled the 125MHz clock circuit feeding the (unused) Struck fADCs. | ||
+ | |[[Image:run_31761_driftbumps_ch23_225bins.png|thumb|x300px|Ch23 cdc time - trigger time hit thr 5sigma timing thr 1sigma, | ||
+ | bump intervals 15, 30, 21 (mean 25.5) | ||
+ | ]] | ||
+ | |[[Image:run_31761_driftbumps_ch20_225bins.png|thumb|x300px|Ch20 cdc time - trigger time hit thr 5sigma timing thr 1sigma, bump intervals 47,45 (mean 46)]] | ||
+ | |[[Image:run_31761_driftbumps_ch20_plust_225bins.png|thumb|x300px|Ch20 cdc time hit thr 5sigma timing thr 1sigma, bump intervals 22, 28, 21, 24 (mean 24.0)]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Drift times run 31744 (horizontal, 2300V, 40%Ar 60%CO2) 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_31744_driftbumps_ch20_plust_225bins.png|thumb|x300px|Ch20 cdc time hit thr 5sigma timing thr 1sigma, bump intervals 21,31,35]] | ||
+ | |} | ||
+ | |||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |+Drift times run 31746 (horizontal, rolled over onto one edge, 2300V, 40%Ar 60%CO2) 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_31746_driftbumps_ch20_plust_225bins.png|thumb|x300px|Ch20 cdc time hit thr 5sigma timing thr 1sigma, bump intervals 20,29]] | ||
+ | |} | ||
+ | |||
+ | Bump at 117ns after t0 for 40/60 gas corresponds to approx 3.3mm from wire, same time for 50/50 corresponds to ~3.5mm from wire. A hit 3.5mm from the wire in 40/60 gas would be at 130ns, moving to 118ns for 50/50. |
Latest revision as of 12:20, 9 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 (horizontal, 2100V)
Bump at 117ns after t0 for 40/60 gas corresponds to approx 3.3mm from wire, same time for 50/50 corresponds to ~3.5mm from wire. A hit 3.5mm from the wire in 40/60 gas would be at 130ns, moving to 118ns for 50/50.