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User name Olivier
Log entry time 13:28:13 on January10,2005
Entry number 138862
keyword=ADC on veto are back
Ran, Eli and I solved the missing ADC in the veto mystery. Two problems were responsible for the strange behavior: the detector map was wrong, so some of the channels were not veto, but either neutron bars or empty. Second, the timing of the gate was off. While the timing was OK for the neutron bars, it appears that the veto signal arrive significantly earlier (~40ns), due to the absence of the summing modules. So most of the signal were not at all within the gate.
I moved the gate 43 ns earlier (removed a 60ns cable, added a 9ns cable and added 8ns from the delay box, center bottom). Now all is here.
I checked also the timing for T3 and T5 with the pulser and all is OK, for both ND and veto. And now we also have the delay box to play with if we are not satisfied later on. Note that a programable delay unit would be nice.