Difference between revisions of "CDC time spikes"

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Prototype at 2100V, 50/50 Ar/CO2
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{| border="0" cellpadding="2"
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|[[Image:prototype_45deg.jpg|thumb|x250px|Tilted detectors]]
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|}
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Trigger signals
 
Trigger signals
 
{| border="0" cellpadding="2"  
 
{| border="0" cellpadding="2"  
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|[[Image:run_31955.png|thumb|x150px|3.5sigma crossing (approx ADC value 112 = (55 + 3x16.5))]]
 
|[[Image:run_31955.png|thumb|x150px|3.5sigma crossing (approx ADC value 112 = (55 + 3x16.5))]]
 
|[[Image:run_31955_thr100.png|thumb|x150px|ADC-value=100 crossing]]
 
|[[Image:run_31955_thr100.png|thumb|x150px|ADC-value=100 crossing]]
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|}
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Histograms of ADC value=100 threshold-crossing bins in individual straws (search started at bin 160)
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{| border="0" cellpadding="2"
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|[[Image:run_31955_thr100_proto_xthr.png|thumb|x450px|ADC-value=100 crossing]]
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|}
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Same data after more normal analysis (Search forward to find pedestal+5sigma crossing, then backwards to find 4sigma and then 1sigma crossings)
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{| border="0" cellpadding="2"
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|[[Image:run_31955_track119_5sigx.png|thumb|x150px|5sigma crossing]]
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|[[Image:run_31955_track119_4sigx.png|thumb|x150px|4sigma crossing]]
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|[[Image:run_31955_track119_1sigx.png|thumb|x150px|1sigma crossing]]
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|}
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{| border="0" cellpadding="2"
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|[[Image:run_31955_track119_pedx.png|thumb|x150px|extrapolation to local pedestal crossing]]
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|[[Image:run_31955_track119_dt.png|thumb|x150px|drift time (ns)]]
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|}
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2-d histograms of ADC value=mean pedestal+50 (= c. 105 to 110) threshold-crossing bins in each straw vs same for one particular straw
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Data are plotted for events with non-zero threshold-crossing in both straws. 
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The histos in each image (set of plots) are arranged as in the prototype, these are the images for the bottom row of straws.
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{| border="0" cellpadding="2"
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|[[Image:run_31955_xthr_p50_2d_9.png|thumb|x250px|straw 9 ]]
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|[[Image:run_31955_xthr_p50_2d_1.png|thumb|x250px|straw 1 ]]
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|[[Image:run_31955_xthr_p50_2d_0.png|thumb|x250px|straw 0 ]]
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|[[Image:run_31955_xthr_p50_2d_8.png|thumb|x250px|straw 8 ]]
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|}
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Noise run (triggered on 20us pulser) ADC=100 crossing bins
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{| border="0" cellpadding="2"
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|[[Image:run_31956_xthr_100.png|thumb|x150px|ADC=100 crossing bin, triggered on pulser]]
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|[[Image:run_31956_3sigx.png|thumb|x150px|3.5sigma crossing bin, triggered on pulser]]
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|[[Image:run_31956_5sigx.png|thumb|x150px|5sigma crossing bin, triggered on pulser]]
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|}
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Noise run (triggered on scintillator when prototype was not above/beneath it) ADC=100 crossing bins
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{| border="0" cellpadding="2"
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|[[Image:run_31960_xthr_100.png|thumb|x150px|ADC=100 crossing bin, random trigger]]
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|[[Image:run_31960_3sigx.png|thumb|x150px|3.5sigma crossing bin, random trigger]]
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|[[Image:run_31960_5sigx.png|thumb|x150px|5sigma crossing bin, random trigger]]
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|}
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 +
Noise run (triggered on scintillator when prototype was not above/beneath it)
 +
2-d histograms of ADC value=mean pedestal+50 (= c. 105 to 110) threshold-crossing bins in each straw vs same for one particular straw
 +
Data are plotted for events with non-zero threshold-crossing in both straws. 
 +
The histos in each image (set of plots) are arranged as in the prototype, these are the images for the bottom row of straws.
 +
{| border="0" cellpadding="2"
 +
|[[Image:run_31960_xthr_p50_2d_9.png|thumb|x250px|straw 9 ]]
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|[[Image:run_31960_xthr_p50_2d_1.png|thumb|x250px|straw 1 ]]
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|[[Image:run_31960_xthr_p50_2d_0.png|thumb|x250px|straw 0 ]]
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|[[Image:run_31960_xthr_p50_2d_8.png|thumb|x250px|straw 8 ]]
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|}
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Some events from the previous cosmics run with data from all ADCs plotted on same graph.
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Trigger time is sample 200.
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{| border="0" cellpadding="2"
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|[[Image:run_31955_evt8.png|thumb|x250px|Event 8 ]]
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|[[Image:run_31955_evt8z.png|thumb|x250px|Event 8, zoomed in ]]
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|-
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|[[Image:run_31955_evt9.png|thumb|x250px|Event 9 ]]
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|[[Image:run_31955_evt9z.png|thumb|x250px|Event 9, zoomed in ]]
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|-
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|[[Image:run_31955_evt12.png|thumb|x250px|Event 12 ]]
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|[[Image:run_31955_evt12z.png|thumb|x250px|Event 12, zoomed in ]]
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|}
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From a run with HV = 0
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{| border="0" cellpadding="2"
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|[[Image:run_32036_evt5.png|thumb|x250px|Event 5, different offset added to each fADC channel (to separate them)]]
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|[[Image:run_32036_evt5z.png|thumb|x250px|Event 5, zoomed in ]]
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|-
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|[[Image:run_32036_evt5_histo.png|thumb|x250px|Event 5, histogram of samples where a single channel has a jump in value of 10 or more since previous sample ]]
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|-
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|[[Image:run_32036_noisebins.png|thumb|x250px|All events, histogram of samples where 18 or more channels have a jump in value of 10 or more since previous sample ]]
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|[[Image:run_32036_noisebins_z.png|thumb|x250px|All events, zoomed in]]
 
|}
 
|}

Latest revision as of 13:28, 15 January 2013

Prototype at 2100V, 50/50 Ar/CO2

Tilted detectors


Trigger signals

Scint and coinc logic signals, scope triggered on coinc (magenta)
Same, with TI busy signal (green)
Same, different timebase


Histograms of threshold-crossing bins in central bank of 16 straws, different thresholds (ignore the histo titles)

ADC-value=150 crossing (~approx ped + 5sigma)
3.5sigma crossing (approx ADC value 112 = (55 + 3x16.5))
ADC-value=100 crossing


Histograms of ADC value=100 threshold-crossing bins in individual straws (search started at bin 160)

ADC-value=100 crossing


Same data after more normal analysis (Search forward to find pedestal+5sigma crossing, then backwards to find 4sigma and then 1sigma crossings)

5sigma crossing
4sigma crossing
1sigma crossing
extrapolation to local pedestal crossing
drift time (ns)


2-d histograms of ADC value=mean pedestal+50 (= c. 105 to 110) threshold-crossing bins in each straw vs same for one particular straw Data are plotted for events with non-zero threshold-crossing in both straws. The histos in each image (set of plots) are arranged as in the prototype, these are the images for the bottom row of straws.

straw 9
straw 1
straw 0
straw 8

Noise run (triggered on 20us pulser) ADC=100 crossing bins

ADC=100 crossing bin, triggered on pulser
3.5sigma crossing bin, triggered on pulser
5sigma crossing bin, triggered on pulser

Noise run (triggered on scintillator when prototype was not above/beneath it) ADC=100 crossing bins

ADC=100 crossing bin, random trigger
3.5sigma crossing bin, random trigger
5sigma crossing bin, random trigger

Noise run (triggered on scintillator when prototype was not above/beneath it) 2-d histograms of ADC value=mean pedestal+50 (= c. 105 to 110) threshold-crossing bins in each straw vs same for one particular straw Data are plotted for events with non-zero threshold-crossing in both straws. The histos in each image (set of plots) are arranged as in the prototype, these are the images for the bottom row of straws.

straw 9
straw 1
straw 0
straw 8

Some events from the previous cosmics run with data from all ADCs plotted on same graph. Trigger time is sample 200.

Event 8
Event 8, zoomed in
Event 9
Event 9, zoomed in
Event 12
Event 12, zoomed in


From a run with HV = 0

Event 5, different offset added to each fADC channel (to separate them)
Event 5, zoomed in
Event 5, histogram of samples where a single channel has a jump in value of 10 or more since previous sample
All events, histogram of samples where 18 or more channels have a jump in value of 10 or more since previous sample
All events, zoomed in
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