[Halld-cal] bcal times from mcsmear are being cut off at t=0

[Richard Jones]

Dear Elton, Zisis,

I am going systematically through each of the subsystems and looking at raw
hits distributions coming out of hdgeant4 / mcsmear, comparing them with
hdgeant / mcsmear and I ran into this surprise that the TDC time
distributions for the bcal coming out of mcsmear seem to be getting chopped
off at t=0. The effect seems to be present at both the upstream and
downstream end (end=0 and end=1, I don't remember which is which. I have
included distributions for the fADC pulse_time values as well for
comparison. These are not being cut off, indicating that the problem is in
mcsmear rather than in Geant. I can reproduce this effect in the hdgeant4
output as well, but I suspect that it is a bug. Unless we are no using the
tdc outputs right now??

A question for you both: would you prefer that this message be posted in
the HallD electronic logbook, or simply posted to the email list?

-Richard Jones

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