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

[Elton Smith]

HI Richard,
To your last question: It is good to put these type of discussions into 
the log book, which makes them easier to find later and to comment on. 
The link can easily be referenced in e-mails to the listserver.

Thanks, Elton.

Elton Smith
Jefferson Lab MS 12H3
12000 Jefferson Ave STE 4
Newport News, VA 23606
(757)269-7625
(757)269-6331 fax

On 1/10/17 8:58 PM, Richard Jones wrote:
> [resending using attachments]
>
> 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
>