[Halld-cal] amplification factor for Bcal electronics
elton at jlab.org
Fri May 25 13:21:42 EDT 2012
I have posted various plots on the elog. From them, I think we need to
reduce the gain to a level similar to that shown for the Vover=0.6 V
data at the 35% point. From Andrei's plot of average amplitude vs bias
overvoltage, we get the following ratios:
( Vover=0.6/Vover=1.2) = 1100/2550 = 0.43
(Vover=0.9/Vover=1.2) = 1800/2550 = 0.71.
Assuming we are aiming for maximum at 2 GeV, we need to take the energy
ratio. At the 35% point, our energy was 0.34*5.551 = 1.89 GeV.
Assuming we want to operate at Vover=1.2 V, then the gain factor should
be 0.43x0.95 = 0.41. That is the gain should be reduced by a factor of 2.5.
We can use these number to guide the discussion this afternoon.
Jefferson Lab MS 12H5
12000 Jefferson Ave
Newport News, VA 23606
(757) 269-6331 fax
More information about the Halld-cal