1. Study of Event Reconstruction for Saturated Pulse
Qian, Yue
IHEP

2. What’s the Problem?
For the detection of reactor neutrino, the distribution of energy will be on a wider range. So the pulses will saturate for some high energy signals.
High energy signals are useful for us to get some information from cosmic ray and some inter-radioactivity.

3. Works to do!
Set up a mathematical model to simulate the complete pulse which has different Q value.
Use suitable parameters or method to obtain the relationship of Qpart and Qtotal

4. Some possible methods
Fit the rise part and fall part of the saturated signal .
Use the top-flat width of the saturated signal
Use the Qpart of the the saturated signal and Qtotal of a statistically good and complete pulse. ( we use it! )

5. A standard pulse ! What’s A good pulse model? 1. Statistically good
2. Big enough
How to get it?
add many big enough but not saturated pulses !

6. The relationship of Q part & Q total
For a complete pulse,
Qtotal , Qpart (imax=255)
(for 512channels)
Change the pulse to obtain different Q value

7. Get the function!

8. The check of this method!
Use 137Cs source
10cm CsI(Tl) crystal + PMT
Different HV of PMT
1050v,1100v, …, 1400v

9. The results of reconstruction for saturated pulses! (1)

10. The results of reconstruction for saturated pulses! (2)

11. The Results! All the reconstructed Q value being fitted exponentially.
This result is accord with amplification of PMT.

12. More work!
About resolution!
This method
Suitable range of energy