sPHENIX tracking discussion

["Pereira Da Costa, Hugo Denis Antonio" <hugo.pereira-da-costa AT lanl.gov>]

Hi Tony,

 

I have started to play around with local alignment parameters and in particular rotations.

 

Just making sure I got the convention right:

In the email below:

Alpha, beta and gamma are the angle from the surface normal vector to the global x, y and z axis, is that correct ? So if I want to make a polar (in x,y plane) rotation of the surface of value phi I should use

alpha = +phi

beta = phi – pi/2

gamma = 0  ?

 

Or do I get the signs mixed up ?

 

Thank you,

 

Hugo

 

From: Anthony Frawley <frawley AT fsunuc.physics.fsu.edu>
Sent: Thursday, August 8, 2024 1:32 PM
To: Hugo Pereira Da Costa <hugo.pereira.da.costa AT gmail.com>; Osborn, Joe <osbornjd AT ornl.gov>; Christof Roland <christof.roland AT cern.ch>; sphenix-tracking-l AT lists.bnl.gov
Cc: Pereira Da Costa, Hugo Denis Antonio <hugo.pereira-da-costa AT lanl.gov>
Subject: [EXTERNAL] Re: Follow up on today's slides

 

Hi Hugo,

 

The easiest way to do 3) is to edit a copy of the current alignment parameters file to change the TPOT values.

 

If you can download the CDB version that would be best.

 

Otherwise:

 

I am on an airplane right now, with close to useless internet speed, so I am working from memory, and the details here are approximate. 

 

Look in my directory 

/sphenix/user/frawley/production/macros/TrackingProduction/

 

There are some files "xxx_localAlignmentParamsFile.txt. The latest one is what is in the CDB. Copy that over to your working directory, rename it "localAlignmentParamsFile.txt" and edit the lines starting with TPOT hitsetkeys. The format is:

 

hitsetkey  dalpha dbeta  dgamma dx dy dz

 

in radians and mm.

 

Cheers

Tony

 

 

---

From: Hugo Pereira Da Costa <hugo.pereira.da.costa AT gmail.com>
Sent: Thursday, August 8, 2024 1:37 PM
To: Osborn, Joe <osbornjd AT ornl.gov>; Christof Roland <christof.roland AT cern.ch>; Anthony Frawley <frawley AT fsunuc.physics.fsu.edu>; sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>
Cc: Hugo Pereira Da Costa <hugo.pereira-da-costa AT lanl.gov>
Subject: Follow up on today's slides

 

Joe, Christof, others,

1/ the CDB tag I use in the reconstruction macro is the one I got from Tony:


   // condition database
   Enable::CDB = true;
   rc->set_StringFlag("CDB_GLOBALTAG", "ProdA_2024");
   rc->set_uint64Flag("TIMESTAMP", 6);

   // tracking geometry
   std::string geofile =
CDBInterface::instance()->getUrl("Tracking_Geometry");
   auto ingeo = new Fun4AllRunNodeInputManager("GeoIn");
   ingeo->AddFile(geofile);
   se->registerInputManager(ingeo);

Is this the correct one ?

2/ to Christof: I have updated the slides I posted at
https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Findico.bnl.gov%2Fevent%2F24192%2Fcontributions%2F95299%2Fattachments%2F56417%2F96569%2FTpcResiduals_hp.pdf&data=05%7C02%7Cfrawley%40fsunuc.physics.fsu.edu%7C4754271da8d24546ac3408dcb7d0d062%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638587355126212973%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=WuPrR92EVWLfAWCAsBND1Wb6aLQ5o8Usew1IUDhLe0M%3D&reserved=0
to look in more detail at delta_phi vs layer with charge cut. This is in
slide 9.

There is a charge dependnece when getting near TPOT, and since each
charge tends to favor one sector rather than the other, this would point
to a sector dependent phi misalignment in TPOT, as you hinted during the
meeting.

3/ Any help about how to add per-layer delta phi (and delta_z) alignment
offsets via text file would be very appreciated ! (Tony ? Joe ?)

Best,


Hugo