[Halld-pid] Start Counter performance

[Justin Stevens]

Hi Beni,

Thanks for the report.  Are the run number labels on the bottom two 1D plots correct or should they be 90479 and 111145 (left and right) to match the 2D plots?  And were the run conditions the same for 81511 and 111145, just to be sure we’re looking at the same conditions for PrimEx for everything besides the SC?

-Justin

On Dec 2, 2022, at 8:08 AM, Beni Zihlmann via Halld-pid <halld-pid at jlab.org> wrote:

Hi All,

to my dismay I have to report that the issue with the start counter timing is most likely
related to a gain problem with the detector.
the two attached plots files show the DeltaT = t_paddle - RF_t of paddle 2 at two different
z positions along the beam z=60 (straight section) and z=90 (nose section)
and below the 2d plots is the projection to the horizontal axis.

one can clearly see that the gain is way lower for run 111145 while for the other runs
40k to 90k the gain is much larger.

I do not understand why that is because the HV read back is pretty much the same for
all runs. This leads me to believe that either the HV modules are lying or somehow the
connection of the HV to the detector is not done right.

cheers,
Beni
<paddle2_signals_z60.gif><paddle2_signals_z90.gif>_______________________________________________
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