Difference between revisions of "CDC time spikes"

Revision as of 17:13, 13 November 2012

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)

ADC=100 crossing bins plotted for all straws against one particular straw

straw 0

@@ Line 30: / Line 30: @@
 |[[Image:run_31955_track119_pedx.png|thumb|x150px|extrapolation to local pedestal crossing]]
 |[[Image:run_31955_track119_dt.png|thumb|x150px|drift time (ns)]]
+|}
+ADC=100 crossing bins plotted for all straws against one particular straw
+{| border="0" cellpadding="2"
+|[[Image:run_31955_thr100_xthr2d_0.png|thumb|x450px|straw 0]]
 |}