sPHENIX is a new detector at RHIC.

[Itaru Nakagawa <itaru AT bnl.gov>]

Dear Collaborators,

 I updated the slides I presented in the last tracking meeting 
reflecting revised material estimate:

https://indico.bnl.gov/getFile.py/access?contribId=0&resId=1&materialId=slides&confId=2865

Updated numbers are found in page 6 - 8.

Best regards,
-itaru


On 2017/02/24 1:21, Itaru Nakagawa wrote:
> Dear Collaborators,
>
> I  have some comments on the material budget of INTT.
>
> On 2017/02/23 15:21, David Morrison wrote:
> > [Current Tracking Issues by Tony Frawley]
> >
> >       Tracking system is moving to more realistic geometry.
> >           Updated MAPS and INTT from cylindrical geometry to ladders.
> >           INTT is proving to be twice as thick in the realistic geometryt
> > as in the cylinder cell geometry. This caused the Upsilon mass width to
> > be wider than specs. RIKEN is exploring possibility to improve tracking
> > to mitigate this effect.
> The current GEANT model is overestimating the material, particularly HDI
> part for following reasons.
> 1) The signal layers are assumed solid copper plane.
> 2) The solid plane bias and GND layers to be replaced by mesh pattern.
>
> These will reduce the material budget down to less than 1% level per
> ladder even including the overlapping ladder.
>
> We will update the GEANT model soon.
>
> Best regards,
> -itaru
>
>
>
>
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