Attendees: Guang Yang (GY), Ciro Riccio (CR), Shih-Kai Lin (SKL), Abraham Teklu (AT), Eric Chong (EC), Dana Douqa (DD), Perri Zilberman (PZ), David Last (DL), Clark McGrew (CMG), Andriaseta Sitraka (AS), César Jesús-Valls (CJV), Martin Tzavoz (MT), Chang Kee Jung (CKJ), Wilf Shorrock (WS), Vittorio Paolone (VP), David Martinez Caicedo (DMC), Etam Noah (EN), Cristopher Mauger (CM)
LANL neutron test beam:
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- MCG: By multi-track do you mean multi-track from the same vertex? GY: Yes.
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CKJ: Detector is not uniform along z because we do not have the same MPPC everywhere. Also neutron elastic scattering would be a problem. GY: Yes, we should rely on the MC for that.
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CKJ: We should have as primary goal the understanding of the response of the detector.
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GY: Not sure about the air gap value. CKJ: We should know the dimension of the detector. These numbers should be in the CERN TB paper? EN: No, actually. GY: I will use as default geometry the one without air gap
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CMG: Can we have a GitHub group as we did in CAPTAIN? GY: Yes, this is the idea. CR: We have already a GitLab project where we have a package where Guang will push all his code.
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CM: slide 5: Is there some angle dependence here? CKJ: FV should be very very tight and we must understand how the angular dependence has an impact. GY: Full talk by Perri next week on this topic.
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CM: slide 6: the plots are MC or data? GY: Both are MC.
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CMG: slide 6: You are probably introducing some bias using the +-1 tick cut. GY: I am giving this talk because we need feedback on these topics. The voxelization is something we should look over again to check the results with a better MC.
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CM: The pion/proton samples? Will you distribute isotropically such events? Yes, starting from the geometric center of the detector.
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CKJ: Do you want to specify the angle? GY: We need the angle w.r.t. beam direction.
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DL: 180 degree we observe hot channels induced by beam.
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CKJ: How many events have single track? GY: I have a MC estimation. For low energy the one track is dominant, while for higher we observe more multi-track events.
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- DL: Do you confirm that the peaks are micropulse times apart aka 1.778877us or whatever (715/716) ticks apart . SKL: Yes, I confirm it.
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GY: David, you told me that we are missing 4 hits and not just the first, right? DL: It was a rudimentary check. We should rely on this study since it is more accurate.
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SKL: Are people suggesting to look macropulse per macropulse? GY: Yes.
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CKJ: slide 10: we can ask beam scientist at LANL to confirm that.
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CKJ: Why we have duplication? GY: if we lift the dt cut, within every trig time (10 microsecond), all hit will be associated with possible t0 trigger, which means one hit will be repeated for 5-6 times.
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SKL: Is there a better way to look at multiple counting? DL: We can discuss offline.
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- GY: I will give you an updated version of the MC but this should not change the results you are showing here.