1. New pre study
The setup
results

2. Charge Preamplifier board and set-up
Side A
New pre
Old pre
HV regulator B side

3. The setup

4. Raw energy distribuion

5. Results Old pre-amp signal/noise New pre-amp signal/noise
In our setup we gain on S/N a factor 2.6 without shaping. If we had a 12 mV peak Beam) from cosmic
this would bring our ENE down to 1.5 MeV Single APD no shaping.

6. Single event study
1 MHz frequency cut
Old pre amp
New pre amp

7. Single event study In red pre-amp signal In green 100 kHz cut
In blue kHz cut
In black 1Mhz cut

8. What happens if I apply the 200 kHz cut?
Brickwall filter sharp 200kHz cut
After 200 kHz cut we get a signal to noise ratio better
than 20 (1.5 MeV single apd)

9. What about butterworth filter ?
Sharp cut on frequency (200 kHz)
N=2
Situation improves a little bit we are close to 1 MeV on
a single APD!