sPHENIX tracking discussion

[nouicer <rachid.nouicer AT bnl.gov>]

Dear Joseph and Tony,

Thank you very much for your feedback. Now, we are all on the same page that the survey data is not implemented in the INTT geometry.

Based on this, please see the attached page (survey group summary page about the INTT location in the IR). Please look  at the the two tables at the bottom of the page, and look at translation row and Z column, you will see that INTT is shift down by -2.851280 mm (-2.785349 mm) this means the beam will be shift up in Y (sPHENIX coordinate) by almost 3 mm. We know also that the beam in PHENIX was sifted by 2 mm up in Y axis.

Conclusion, this shift of 5 mm observed by the INTT detector in beam spot in Y axis is combination of INTT geometry by 3 mm and beam shift by 2 mm, in my opinion.

Let hope that survey geometry will be implemented soon, and we can reanalyze the data.

Thank you very much.

Sincerely,
Rachid
 

On 7/17/23 9:41 PM, Bertaux, Joseph Tyler wrote:

        Hello,
      
        
      
      
        The survey data hasn't been compiled; I see an approximate 5mm
        shift in "y" in the survey data, but I'm not sure if it's the
        actual "y" coordinate. It's the second in the list but the
        physical dimensions and values seems to be consistent with the z
        coordinate.
      
        
      
      
        I've had to guess which coordinates are actually which, and I
        need to modify the mapping of our online/offline indexing
        conventions again after noticing the reference image I've been
        using is mirrored on the x axis.
      
        
      
      
        I'll remedy this tonight and tomorrow.
      
        
      
      
        What specific values are those plots for? Because if you're
        plotting the mean strip_x/strip_y, "strip_y" is actually along
        the z axis and this would make sense with what I'm seeing.
      
        
      
      
        Whatever it turns out to be, I'm confident you can attribute
        this to the INTT's position and not the actual beam. My guess is
        the reconstruction is still using the default model, which would
        be close to nominal, while the survey shows a shift that hasn't
        been incorporated yet. Consequently you see the shift in the
        beam center.
      
        
      
      
        Joseph

---

From: Sphenix-intt-l <sphenix-intt-l-bounces AT lists.bnl.gov> on behalf of nouicer <rachid.nouicer AT bnl.gov>
Sent: Monday, July 17, 2023 7:38 PM
To: sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>; sphenix-run-l AT lists.bnl.gov <sphenix-run-l AT lists.bnl.gov>; sphenix-intt-l AT lists.bnl.gov <sphenix-intt-l AT lists.bnl.gov>
Subject: [Sphenix-intt-l] Beam Spot and sPHENIX/INTT Geometry

 

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Dear Joseph and Tony,

Please see the attached plots which correspond to the RHIC beam spot in X, Y directions obtained by the INTT detector using beam data with magnet-OFF run =20869 taken on 08 July 2023.

We observe that the beam spot coordinates is (0 mm, 5 mm); this means the beam spot is shifted by five mm in Y direction.

Before Stefan shows this plot to CAD, we need to understand is this shift by five mm is due to the beam shift itself, or it is caused by the INTT detector geometry (not fully implemented in our software).

I already provided you with the INTT local survey data (obtained at the lab for each ladder) as well with INTT Global survey data (obtained at the sPHENIXPHENIX IR).  Are these survey data implemented in the present sPHENIX/INTT detector geometry that we are using in our analysis or not?

We would highly appreciated your feedback. 

Sincerely,
Rachid for the INTT Group

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                                                 /                     /
 Rachid Nouicer                                 /                     /
 Brookhaven National Laboratory                /                     /
                                              /                     /
 Address:                                    /                     /
 Brookhaven National Laboratory (BNL)       /                     /
 Physics Department, Building 510c         /                     /
 20 Pennsylvania Avenue                   /                     /
 Upton, New York, 11973, U.S.A.          /Phone:+1 631 344 8433/
                                        /                     /
 E-mail : rachid.nouicer AT bnl.gov       / Fax:+1 631 344 3253 /
 Web:http://www4.rcf.bnl.gov/~nouicer /                     /
                                     /                     /
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                                                 /                     /
 Rachid Nouicer                                 /                     /
 Brookhaven National Laboratory                /                     /
                                              /                     /
 Address:                                    /                     /
 Brookhaven National Laboratory (BNL)       /                     /
 Physics Department, Building 510c         /                     /
 20 Pennsylvania Avenue                   /                     /
 Upton, New York, 11973, U.S.A.          /Phone:+1 631 344 8433/
                                        /                     /
 E-mail : rachid.nouicer AT bnl.gov       / Fax:+1 631 344 3253 /
 Web:http://www4.rcf.bnl.gov/~nouicer /                     /
                                     /                     /
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Attachment: INTT LOCATION 3-21-23.pdf
Description: Adobe PDF document