Commissioning and running of sPHENIX

["Huang, Jin" <jhuang AT bnl.gov>]

Hi Everyone

In the post shift change meeting on MVTX, I got myself a home work of checking out what happens if a high energy ion hits MVTX sensor plane. That is to find out the mystery of MVTX dropout event which Cameron found contain a narrow core plus a comet of busy hits around it. https://chat.sdcc.bnl.gov/sphenix/pl/ezadz1pui3gyzdy69u46zn8oae 

The simulation of Au ion hitting MVTX can be reproduced with https://github.com/blackcathj/macros/blob/AuOnMVTX/detectors/sPHENIX/Fun4All_G4_sPHENIX.C 

The analysis notebook with the interactive plots can be found at https://nbviewer.org/github/blackcathj/macros/blob/6d1c9c37/detectors/sPHENIX/Analysis.ipynb 

I believe it qualitatively reproduce the narrow core + a comet of hits on MVTX upset events as Cameron observed in data.

Note in this simulation, Au ion is placed outside the beam pipe at z=-30cm and carries beam energy. However, in reality it probably originate from within the beam pipe and has to passing through the Al beam flange. It is harder to find a shower core aligning with MVTX sensor plane in simulation if the simulation starts from within beam pipe. Nonetheless, welcome to try updating the above macro to give a try. 

Cheers

Jin

PS: some interactive plot in https://nbviewer.org/github/blackcathj/macros/blob/6d1c9c37/detectors/sPHENIX/Analysis.ipynb take some time to render, such as 

 

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Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

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