Attendees: Guang Yang (GY), Ciro Riccio (CR), Shih-Kai Lin (SKL), Abraham Teklu (AT), Dana Douqa (DD), Perri Zilberman (PZ), David Last (DL), Andriaseta Sitraka (AS), Martin Tzavoz (MT), Chang Kee Jung (CKJ), Wilf Shorrock (WS), David Martinez Caicedo (DMC), Etam Noah (EN), Cristopher Mauger (CM), Rado Fanantenana Razakamiandra (RFR), Alexander Torres (AT), Rick Van Berg (RVB), Vittorio Paolone (VP), Cesar Jesus-Valls (CJV)

Link to indico: https://indico.cern.ch/event/941338/

Cross talk study - Wilf Shorrock
- CK: Slide 4: Are this “and" cuts? WS: If an event has more than 50 PE then it is a non-cross-talk event otherwise will go through all the cuts.
- DL: Slide 5: Try without type three MPPC. WS: I have more plots later.
- CMG: Are you going to use this in pattern recognition? Cross-talk is actually signal. WS: Yes.
- DL: If we take out the corner event what the impact. WS: It is hard to tell. DL: I am curious if they are necessary and if they cause problem with pattern recognition.
- CK: If you have particle going through the corner can leave few PE.
- CGM: Are you applying a window for dark noise? WS: Yes. CMG: You can use delta T between the nearest neighbour.
- CK&CJV: Dark counts for MMPC type-1 is 70 kHz, type-2 90 kHz, type-3 100 kHz.
- CK: More information cannot be bad. The analysis algorithm
- GY: We can apply WS to classify cross-talk. We need another algorithm for dark counts due to type-3 MPPC.
Cosmic study - Alexander Torres
- DL: What cut are you making? AT: Details on slide3:
- - Voxelization of time clustered hits using a ticks cut of 2
  - Clustering of voxels using a max distance of 1.5 and the minimum nodes cut of 1
  - Cut placed on clusters which don’t have a voxel in both the top and bottom cubes of the detector
  - Make cut on reconstructed time and eigenvalues.
- GY: How many cosmic we have in total? AT: I don’t know yet. I wasn’t able to unpack all the cosmic data. GY: We can discuss offline your unpacking problem.
- DL: It is complicated that a neutron induced event can end up in this sample.
- DL: [Couldn’t hear the question because of the background noise. I guess it was about unpacking.]
Uncertainty Summary - Guang Yang
- CMG: Pencil beam of neutron. What happen from the collimator itself. GY: I have more in the next slides.
- CK: In G4 is possible to select only the elastic scattering? GY: Yes. CK: You can study directly the elastics scattering.
- CMG: Any scattering outside of the beam? GY: No. CMG: Is the first interaction of the neutron inside the detector? GY: I throw away all the interaction that are outside 0.2 cm radius.
- CK: I don’t understand what do you mean by flux? GY: Flux is the neutron flux. CK: If you are generating pencil beam, the flux should be uniform on the surface. You shouldn’t used the word “collimated” because you are simulating such events and the word “flux” because you are talking about rate.
- CK: Where is the beam center? GY: It is in the corner of the 2x2 FV.
- CMG: What is the definition of "First induced hit”? GY: First induced hit above threshold. CMG: What are you plotting on slide 5? The beam spot.
- CK: Let me clarify for everyone. You have two cases:
- - In reference Guang is assuming that since the radius is 0.2 cm the elastic scattering contribution is very small
  - In the other case you have the most realistic scenario
  - You compare the two cases and you get the fractional uncertainty
- CK: What is zero here? GY: The fit range is from x to 48.
- CK: Why the error increases? GY: I guess dead material. If I take away dead material the error is lower.
- DL: Do you require the vertex to be the first hit in cluster? GY: No. DL: The crossing point can be in the middle of the track.
- MT: Have you try it in our size detector? GY: This one is bigger. MT: We should look at more realistic size.
- CK: Slide 10/11: Shift in which direction? GY: In z.
- DL: Different MPPC will have different PE threshold.
- MT: What do you mean when you say that our precision is limited by elastic scattering? GY: It is the largest contribution to the error budget.
- MT: What are the percents of event that have an elastic scattering before they produce a track? GY: To be studied