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Detector DAQ Setup

  • Gate to ADC MUST NOT be disconnected!!!

The ADC hardware trigger, soft triggers the acquisition for the rest of the CAMAC crate which happens to be the TD2 & 4s for the readout of the whole CBPM system (further down the timing line) and the magnet system - so definitely don't unplug.

  • The gate delay and width can however be adjusted as long as the gate is sufficiently wide for the others to trigger.
  • There is a 'T' in the trigger line. The gate can be monitored on an oscilloscope using 1MOhm impedance (effectively passive to 50 Ohm).

Setup

  • After breaking and fixing readout for everyone else, adjust gate width and delay to overlap with PMT pulses from each detector
  • Raised voltage slowly during beam time on each pmt until between 500mV - 1V pulses were seen (from experience).
  • 900V was sufficient and there was strong signal in both at 1kV.
  • Timing is shown in the picture below.
  • Data is in dat/general/20150616_detector_gate_setup/
  • Green is detector 2 (new location further upstream)
  • Yellow is detector 1 (laserwire location)
  • Blue is the gate signal - note ringing oscillations are from mismatch into 1MOhm impedance

scope_1.png

-- Public.LaurieNevay - 17 Jun 2015

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Topic revision: r2 - 15 Feb 2016 - LaurieNevay

 
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