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<font face="Helvetica, Arial, sans-serif">Hi All,<br>
<br>
to my dismay I have to report that the issue with the start
counter timing is most likely<br>
related to a gain problem with the detector.<br>
the two attached plots files show the DeltaT = t_paddle - RF_t of
paddle 2 at two different<br>
z positions along the beam z=60 (straight section) and z=90 (nose
section)<br>
and below the 2d plots is the projection to the horizontal axis.<br>
<br>
one can clearly see that the gain is way lower for run 111145
while for the other runs<br>
40k to 90k the gain is much larger.<br>
<br>
I do not understand why that is because the HV read back is pretty
much the same for<br>
all runs. This leads me to believe that either the HV modules are
lying or somehow the<br>
connection of the HV to the detector is not done right.<br>
<br>
cheers,<br>
Beni<br>
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