sPHENIX tracking discussion

["Kotov, Ivan" <kotov AT bnl.gov>]

Hi Joe,

 

From general detector design, and I have INTT as a model,

• each sensor has 3 degree of freedom/misalignment, [x,y,angle] on the plane of the ladder
• each ladder has 6 degrees of freedom [x,y,z,+3 angles] as a solid body

These parameters are enough to determine where each sensor is located in space.

I’ve assumed than sagging of the ladder is negligible.

 

My two cents,

Ivan

 

From: Sphenix-tpc-l <sphenix-tpc-l-bounces AT lists.bnl.gov> on behalf of "Osborn, Joe" <osbornjd AT ornl.gov>
Date: Tuesday, August 3, 2021 at 13:40
To: Anthony Frawley <afrawley AT fsu.edu>, "sphenix-intt-l AT lists.bnl.gov" <sphenix-intt-l AT lists.bnl.gov>, "sphenix-tpc-l AT lists.bnl.gov" <sphenix-tpc-l AT lists.bnl.gov>, "sphenix-mvtx-l AT lists.bnl.gov" <sphenix-mvtx-l AT lists.bnl.gov>, "sphenix-l AT lists.bnl.gov" <sphenix-l AT lists.bnl.gov>
Cc: "sphenix-tracking-l AT lists.bnl.gov" <sphenix-tracking-l AT lists.bnl.gov>
Subject: Re: [Sphenix-tpc-l] [EXTERNAL] [Sphenix-tracking-l] Detector subsystem alignment degrees of freedom?

 

Hi all,

 

I’m re-forwarding this email to a larger audience in response to the discussion in the software meeting today. It would be very useful to hear from the tracking subsystem experts on alignment considerations, e.g. what degrees of freedom are expected to be needed for aligning the detector (and any other relevant alignment related thoughts that have already happened).

 

Joe Osborn

 

---------------------------

 

Joe Osborn, Ph.D.

Associate Research Scientist

Oak Ridge National Laboratory

osbornjd AT ornl.gov

(859)-433-8738

 

 

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>
Date: Monday, July 19, 2021 at 12:30 PM
To: sphenix-intt-l AT lists.bnl.gov <sphenix-intt-l AT lists.bnl.gov>, sphenix-tpc-l AT lists.bnl.gov <sphenix-tpc-l AT lists.bnl.gov>, sphenix-mvtx-l AT lists.bnl.gov <sphenix-mvtx-l AT lists.bnl.gov>
Cc: sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>
Subject: [EXTERNAL] [Sphenix-tracking-l] Detector subsystem alignment degrees of freedom?

Dear MVTX, INTT and TPC experts,

 

It would be very helpful to have a list of all of the alignment degrees of freedom for each of the three tracking detectors. It should include all of the possible misalignment degrees of freedom - from the overall positioning of the detector down to the smallest detector element.

 

If we can get this sometime this week, it would be even more helpful!

 

Thanks

Tony