sPHENIX tracking discussion

[Ming Liu <ming AT bnl.gov>]

Hi Tony,

Sounds good, looking forward to Reese’s PR.

It would be good to have some tests with known offsets with the much simple MVTX 8-stave telescope first then the half-detectors.

 

Cheers,

Ming

 

 

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Dr. Ming Xiong Liu P-3, MS H846 Physics Division   Office: 505.667.7125 Mobile: 505.412.7396 Los Alamos National Laboratory

 

 

From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of Anthony Frawley via sPHENIX-tracking-l <sphenix-tracking-l AT lists.bnl.gov>
Reply-To: Anthony Frawley <afrawley AT fsu.edu>
Date: Tuesday, August 30, 2022 at 5:36 PM
To: Ming Liu <mliu AT lanl.gov>, "sphenix-tracking-l AT lists.bnl.gov" <sphenix-tracking-l AT lists.bnl.gov>
Subject: Re: [Sphenix-tracking-l] Embedding simulated tracks in real data

 

Hello Ming,

 

The code to implement alignment constants in the tracking should be part of a PR by Reese Boucher in the next day or two. We just need to get the (all zero for now) alignment constants file in the database.

 

The constants that are implemented are:

(α, β, γ) = small rotations around the (x,y,z) axis in the frame of the sensor.

(dx, dy, dz) = translations of the sensor position in global coordinates.

 

These perturbations are combined with the transformation derived from the simulation geometry. The latter is what we presently use in the tracking GeometryContext. 

 

It would be good to discuss how we can do some tests involving deliberate misalignment and correction.

 

Cheers

Tony

 

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From: Liu, Ming Xiong <mliu AT lanl.gov>
Sent: Tuesday, August 30, 2022 6:04 PM
To: Anthony Frawley <afrawley AT fsu.edu>; sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>
Subject: Re: [Sphenix-tracking-l] Embedding simulated tracks in real data

 

Hi Tony,

Thanks for the slides, they are very helpful for me to understand the current tracking approach.

 

A quick question about misalignment correction:

We had some discussions among MVTX folks about implementing the MVTX misalignment corrections.

One of the ideas is to use the transformation matrix to implement the offset of a sensor position d(x,y,z,a,b,g) from the ideal geometry (the GEANT).   

Do we have a machinery ready to do such corrections?  

 

The current ML-based MVTX alignment has the capability to get the offset d(x,y,z,a,b,g) from standalone tracking.

 

Cheers,

Ming

 

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Dr. Ming Xiong Liu P-3, MS H846 Physics Division   Office: 505.667.7125 Mobile: 505.412.7396 Los Alamos National Laboratory

 

 

From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of Anthony Frawley via sPHENIX-tracking-l <sphenix-tracking-l AT lists.bnl.gov>
Reply-To: Anthony Frawley <afrawley AT fsu.edu>
Date: Tuesday, August 30, 2022 at 11:49 AM
To: "sphenix-tracking-l AT lists.bnl.gov" <sphenix-tracking-l AT lists.bnl.gov>
Subject: [Sphenix-tracking-l] Embedding simulated tracks in real data

 

Hi All,

 

Following the discussion at yesterday's tracking software meeting, I have updated my slides on de-aligning and aligning sPHENIX tracking at:

https://indico.bnl.gov/event/16867/

 

The new slides 9 and 10 outline how I think we can embed simulated tracks in real data without modifying the simulation geometry.

 

Tony

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