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TDC working! (thanks to Paul Dauncey )

Last Friday swapped the 767 for the 1290 (with NIM input) Paul worked the whole weekend. Got it working and has first read-outs. TDC working! (thanks to Paul Dauncey ). Erik van der Kraaij CERN LCD September 13, 2010. 50x50 coincidence signal .

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TDC working! (thanks to Paul Dauncey )

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  1. Last Friday swapped the 767 for the 1290 (with NIM input)Paul worked the whole weekend. Got it working and has first read-outs. TDC working!(thanks to Paul Dauncey) Erik van der Kraaij CERN LCD September 13, 2010

  2. 50x50 coincidence signal • The plot is of channel 6, which has a direct coincidence from the 50x50 scintillator. The rising edge is always at 1000ns which  is the offset for the trigger window • Note, the TDC has an absolute window limit of ~1.5us after the trigger; it will capture no hits after this time for a trigger Erik van der Kraaij, CERN LCD

  3. Pulse signal • The cut-off at 1.5us is clearly visible in channel 7, which is an asynchronous pulser running at 500kHz. • This should give a flat distribution throughout the whole TDC window • but as shown, it falls off around 2500ns i.e. ~1.5us after the trigger, even though the window set is longer.  Erik van der Kraaij, CERN LCD

  4. One wire chamber channel • channel 0 is the LEFT tracking chamber outputs.  • The plot shows the time distribution, which I would interpret as having a width of around 400ns for tracks in time with the trigger and a long(ish) tail on the high side. • This will require more study to check if this really is the usable range for tracks in the event, but if so, it would suggest the 1.5us cutoff will not impact us.  Erik van der Kraaij, CERN LCD

  5. Correlation between L-R • The plot shows the correlation in time of hits from the left and right wire chamber readout. • As a particle hit is read out both sides, then the sum of the two distances (and hence times if the velocity is linear) should be a constant. • This is equivalent to an anticorrelation, as is clearly shown. LEFT-RIGHT • This means firstly, the chambers and TDC are working sensibly, and secondly, that the TDC cut-off (at 2500ns on this scale) is not an issue. Erik van der Kraaij, CERN LCD

  6. Correlation between Up-Down • The plot shows the correlation in time of hits from the down and up wire chamber readout. • As a particle hit is read out both sides, then the sum of the two distances (and hence times if the velocity is linear) should be a constant. • This is equivalent to an anticorrelation, as is clearly shown. UP-DOWN • This means firstly, the chambers and TDC are working sensibly, and secondly, that the TDC cut-off (at 2500ns on this scale) is not an issue. Erik van der Kraaij, CERN LCD

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