sPHENIX tracking discussion

[Hugo Pereira Da Costa <hugo.pereira-da-costa AT cea.fr>]

As discussed,

I have generated some maps that "should" be a better inversion of the input distortion maps: at least running with them does not give crazy result, and for the static, cm distortions, I see some improvements in the residuals (after truth tracking) when using the inverted map rather than re-using the input map.

Below are the two configurations I have been using:

1/ static only distortions (O(cm)) due to ExB

      // space charge distortions
      G4TPC::ENABLE_STATIC_DISTORTIONS = true;
      G4TPC::static_distortion_filename =
"/star/u/rcorliss/sphenix/trackingStudySampleNov2021/static_only.distortion_map.hist.root";
        
      // space charge corrections
      G4TPC::ENABLE_CORRECTIONS = true;
      G4TPC::correction_filename =
    "distortion_maps-new/static_only_inverted_4.root";

2/ beam induced, time averaged:

  // space charge distortions
  G4TPC::ENABLE_STATIC_DISTORTIONS = true;
  G4TPC::static_distortion_filename = "/phenix/u/hpereira/sphenix/work/g4simulations/distortion_maps-new/average_minus_static_distortion_converted.root";
   
  // space charge corrections
  G4TPC::ENABLE_CORRECTIONS = true;
  G4TPC::correction_filename = "/phenix/u/hpereira/sphenix/work/g4simulations/distortion_maps-new/average_minus_static_distortion_inverted_4.root";
 

On my side:

- with truth tracking, both 1 and 2 give some "reasonable" but not perfect residuals, momentum resolution and invariant mass resolution. To me this validates to some extend the cluster mover and acts fit.

- with full tracking: 2/ works reasonably well. 1/ has very poor efficiency (30%), meaning that something is not right in our track finding.

Don't hesitate if you have any question.

Hugo

On 12/13/21 06:59, Osborn, Joe via sPHENIX-tracking-l wrote:

Let’s have our usual tracking meeting starting in ~1 hour for those that are available. Here’s an indico page for slides if anyone has any:

 

https://indico.bnl.gov/event/13989/

Joe Osborn

 

---------------------------   Joe Osborn, Ph.D. Associate Research Scientist Oak Ridge National Laboratory osbornjd AT ornl.gov (859)-433-8738

 

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