sPHENIX tracking discussion

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

Dear Ed,

>What would be the plan to fully populate the sPHENIX
> vertex tracker with good working ladders?

Your question arrives on time, we are writing a technical note on silicon pixels' tracker, and it is located at (work in progress):  
https://www.overleaf.com/4554469gmfrch#/13709975/ 
 
This week, we are working on available elements of silicon pixels' tracker: 1) silicon pixels' ladders, 2) readout bus extender, 3) silicon Pixel Interface Readout (SPIRO) boards, and 4) Front End Module (FEM). 

 

We know that we have 30 ladders at IR. We need to determine exactly working channels in each ladder. Furthermore, we have 10 ladders (never been used before) some of these ladders are at BNL in the silicon lab, and some of them are at RIKEN. Based on the test results from document of these 10 leaders, I see that we have six very good ladders. I hope we will answer to your question when we are done with this document as soon as possible. It was not easy to collect documents/information from several institutions to put this document together, but we are close to finish. 
 

Another point, we can always reduce the radius of P0 and P1 (be closer to the beam pipe, still some clearance with beam pipe and B0, black circle in Fig 12 of the technical note, consequently  P1 can move in) and in this case, we can reduce the number of ladders in P0 and P1 and have some spares. 

>Also I am sure that in your last slide you meant that the first step
>of VTX integration into sPHENIX is done. A 3-D model of
>VTX ladders floating free in space as you showed is just the very
>start of Integration. But I'm sure that you know that. Thanks.

Certainly, your are correct. This is just a first look to have a good idea of the tilt angle of the ladder in P0 and P1...and generates good questions like yours; do we have enough ladders? And what can we do to have some spares' ladders? 
The word "done" on the slide, it was related to the request "How many ladders are needed in P0 and P1 for the radius of r0 and r1, which have been suggested". These radii, r0 and r1, can be changed if necessary. This configuration can be implemented in GEANT in sPHENIX (instead of having a cylinder). Gaku is working for the implementation of this configuration in GEANT/sPHENIX.   
 

Sincerely,
Rachid

On 04/15/2016 04:56 PM, EdwardOBrien wrote:

        HI Rachid,
          I have a couple of questions about the slides that you showed at the
    sPHENIX Tracker meeting today. Your slides show that when specific
    radii and ladder tilt angles are chosen for pixel layer P0 and P1
    you need 32 working ladders plus spares. My understanding is that
    the current PHENIX VTX has 30 ladders, of which ~ 40% have large
    dead areas.  What would be the plan to fully populate the sPHENIX
    vertex tracker with good working ladders?
     Also I am sure that in your last slide you meant that the first step
    of VTX integration into sPHENIX is done. A 3-D model of
     VTX ladders floating free in space as you showed is just the very
    start of Integration. But I'm sure that you know that. Thanks.


    Ed

    

On 4/14/2016 11:15 AM, Frawley, Anthony wrote:

HI All,

We will have an sPHENIX tracking meeting tomorrow, Friday April 15, at 9:00 am ET. The Indico page is:

https://indico.bnl.gov/conferenceDisplay.py?confId=200

The agenda is still clarifying.

In addition to reports on the detector options, I would like to have a general discussion about what is needed to meet the ALD's charge on detector cost. Mainly I would like to discuss what we will need to do to characterize the physics deliverd by tracking options, and how we will do it.

Cheers

Tony

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                                              /                       /
 Rachid Nouicer                              /                       /
 Physicist                                  /                       /
 Brookhaven National Laboratory (BNL)      /                       /
 Physics Department, Building 510c        /                       /
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 Upton, New York, 11973, U.S.A.         /Phone: +1 631 344 8433 /
 E-mail : rachid.nouicer AT bnl.gov       / Fax: : +1 631 344 3253/
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