sPHENIX tracking discussion

[Anthony Frawley <afrawley AT fsu.edu>]

Hello Rachid,

We are still looking at the simulation results to understand this.

However I can make one comment. The sensor for ladder zero (L0) has a total length of 92 mm but an active length of 90 mm. For the 4 sensors in L0, this means there are 3 gaps, totaling 6 mm of dead material, inside the acceptance. That is 1.7% of the sensor area that is dead for each layer. For L1-3, there is 6 mm of dead length out of 464 mm, or 1.3% dead area per layer.

Cheers

Tony

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From: nouicer <rachid.nouicer AT bnl.gov>
Sent: Wednesday, August 29, 2018 2:52 PM
To: Christof Roland; Anthony Frawley; sphenix-tracking-l AT lists.bnl.gov
Subject: INTT acceptance in phi

 

Dear Tony and Christof, 
 
Fellowing our discussion during last general meeting about the INTT acceptance, we put some efforts to check the INTT acceptance, see attached file obtained directly from detector engineering design (we have more drawings). In our design, the INTT acceptance is 100%. We found out that it is very difficult to understand on how you end up with 92% acceptance in phi as you reported in the meeting. The particle has to go at least through three layers, even if the particle has very low momentum. Could you check the INTT geometry in simulation to make sure  that we have the correct coverage in phi, hardware conceptual design and software geometry should be the same? 

If you can give us some feedback on how did you get 92% acceptance in phi, we can work on improving the design. 
 
Thanks. 
 
Sincerely, 
Rachid