sFGD beam test analysis

Friday 3 Jul 2020, 14:40 → 17:45 Europe/Zurich

https://fnal.zoom.us/j/257160569

15:00 → 15:05 Analysis plan

Speaker: Guang Yang (Stony Brook University)

LANL_Jul2_2020_gyang.pdf

15:05 → 15:25 Analysis update

Speaker: Shih-Kai Lin

20200703_wrap-around.pdf

15:25 → 15:45 Analysis update

Speaker: Wilf Shorrock (Imperial College (GB))

WilfS_26Jun20_LANLCuts.pdf

15:45 → 15:55 Software framwork building

Speaker: Ciro Riccio (Università degli Studi di Napoli Federico II e INFN sezione di Napoli (IT))

Riccio_sfgdmeetingJuly112020.pdf

15:55 → 16:15 Analysis update

Speakers: Abraham Meles Teklu (Stony Brook University (US)), Eric Chong

July1stUpdate.pdf

16:15 → 16:30 Thoughts on the analysis

Speaker: Dana Douqa (Universite de Geneve (CH))

LANL_discussion.pdf

16:30 → 16:45 Understanding different geometries

Speaker: Perri Zilberman

16:45 → 17:05 CERN beam test paper

17:05 → 17:25 CERN beam test analysis update

Speaker: Wilf Shorrock (Imperial College (GB))

17:25 → 17:35 Meeting Minutes

Speaker: Ciro Riccio (Università degli Studi di Napoli Federico II e INFN sezione di Napoli (IT))

Attendees: Guang Yang (GY), Ciro Riccio (CR), Shih-Kai Lin (SKL), Wilf Shorrock (WS), Abraham Teklu (AT), Eric Chong (EC), Dana Douqa (DD), Perri Zilberman (PZ), Chang Kee Jung (CKJ), David Last (DL), Etam Noah (EN), Clark McGrew (CMG), David Martinez Caicedo (DMC), Rick Van Berg (RVB), Andriaseta Sitraka (AS)

 

CERN test beam data analysis:

• Etam: we do not have an update today. We have just circulated the paper and we are waiting for comments.

 

LANL neutron test beam:

• Guang Yang - Analysis plan 
  • GY: Action items all covered by the various groups included in this analysis. 
  • GY: slide 4: MC spread as observed in CAPTAIN.
  • CKJ: CAPTAIN see this in data or MC? CMG: In MC as Guang sees. CKJ: Is this caused by elastics scattering? CMG: Secondary inelastic scattering but still to be understood. CKJ: We need to investigate this further. 
  • CKJ: How CAPTAIN dealt with this? CMG: This was a systematics for the CAPTAIN analysis.  
  • CR: comparison with models is important. CMG: True, but this mis-modelling in G4 make harder the systematics error estimation 

 

• Shih-Kai Lin - Wrap around study
  • DL: Probably we have to extend it 1.8 microseconds. We can look at the raw files. 
  • SKL: Is everyone going to use the same data structure? GY: Yes, we will use this structure for data and MC. CR: We are developing a software framework and you can start to use it for your studies. Email me and I’ll add you to the gitlab group where this code is stored.
  • DL: Some people refer to macropulse [Ciro: I didn’t get if it was micro or macro] as proton bunch. We can call macropulse “spill”.
  • DL: Slide 11: our trigger does not start until our second proton trigger arrives. Things you are seeing before are "mid-neutron". GY: You are not seeing the real first neutron. CKJ: This means the first MP is actually the second. GY: Yes. CKJ: If you plot the MP data you should see MP-1. Somebody should check this. 
  • SKL: Slide 12: I used the wrong variable for the PE so I will redo these plots.
  • DL: Shin-Kai, can you investigate what is the actual difference in power between the MP? SKL: Yes, will do. 

 

• Wilf Shorrock - Time and charge cuts for LANL data
  • GY: What energy corresponds to the red line on slide 5? WS: I don’t remember. 
  • Important information from Wilf:
  • 20 PE cut applied to CERN data to remove cross-talk. We should understand if this is still valid for LANL data analysis.
  • Cut on Dt to be used for LANL data analysis for remove gammas: -326 ns (90 m data) -278 ns (20 m data).
  • CKJ: Can you calculate the energy vs time difference?I mean the actual number. It could be useful for the future. GY: Yes we can. We already have the plot and we can translate it into a table. 

 

• Ciro Riccio - Software framework building
  • DMC: plan to have calibration in this framework? CR: Yes, we will do it. This code already exists under sfgd_framework and we plan to import it under this gitlab group so that everyone involved in the LANL test beam analysis can use it. 
  • DMC: About the documentation, do you plan to have a wiki? CR: For the moment a basic README where there is all the information to get started. As soon as we gather feedback from the other users we can 

 

• Eric Chong - Voxelization update 
  • CKJ: What do you mean by no time delay between MPPC hits? GY: We correct for the time delay due to the fiber length.
  • CKJ: [Ciro: missed the last question]
  • GY: In the MC Eric I did not include cross-talk, but I’ve processed some MC with this information included and we will make the study Eric showed using also such MC. 

 

• Dana - Thoughts on the analysis: 
  • DD: My suggestion is to cut on the cross-talk after the voxelization and not before. For the CERN test beam data analysis we cut on the minimum charge of the three fiber and the cut is at 10 PE. Also, the time tick cut using which you get rid of the ghost voxels is too strict. You should avoid to use that and just use the cut on the energy as I suggest in the last slide. In this way, you get a better purity in terms of cross-talk and ghost hits. 

 

• Perri Zilberman - Understanding different geometries
  • Oral update: I’ve looked at different FV cut and collimator cut with different geometry and I’ve found that they overlap nicely.