ADC spectra from TOF paddle
- To measure timing resolution of the ADC+LED combo (and to
compare it with 3 types of CFD), we are using 12-bit VME QDC from
CAEN V265.
- According to CAEN, the minimum gate width for this ADC is 100 ns.
However, there is no clear separation of the signal from the pedestal
for the inefficient PMT. Therefore, 50 ns gate width was used.
- Cosmic ray hits were measured with our 1cm/1cm trigger telescope
positions at the paddle center.
- We are still trying to understand the non-linearity of the ADC measurements
of large signals from both ends. It looks like the left signal becomes "saturated".
Perhaps, 50 ns gate is too tight for large signals.