[Central_tracker] SVT electronics' location (L1 disconnect)

[Mary Ann Antonioli]

As per Amrit:

Our current information from the Mechanical group is that the upstream 
end of the coldplate is at -337 mm from target center.  Based on this:
level 1 disconnect for reg1 will start at -700 mm wrt target center
level 1 disconnect for reg2 will start at -670 mm wrt target center
level 1 disconnect for reg3 will start at -640 mm wrt target center

Cylinder 1, which attaches to coldplate, has a radius of 60 mm wrt 
beamline and a length of 75 mm,
Cylinder 2, which attaches to cylinder 1, has a radius of 130 mm wrt 
beamline, the length of which is irrelevant for the SVT.

Radially, all level 1 disconnects will start on cylinder 2.
For the L1C disconnects of the three regions,we estimate that we need 45 
mm above the support tube, (cylinder 2).  45 mm gives 15 mm per L1C 
disconnect.  This space is required for PC board, connector, and clearance.
Originally, we were informed that the micromegas electronics would end 
at a radius of 180 mm.  We have worked hard to reduce our space 
requirements to 175 mm radially.
If it is possible to extend cylinder 1 by ~290 mm, we could reduce our 
radial requirements to a radius of 150 mm.  This would also help the SVT 
in that all electronics would be in the cylinder 1 well.


-------- Original Message --------
Subject:     RE: Urgent: answer on Si interconnect boxes
Date:     Tue, 14 Dec 2010 15:03:11 +0100
From:     Aune Stephan <stephan.aune at cea.fr>
To:     Mac Mestayer <mestayer at jlab.org>, Amrit Yegneswaran 
<yeg at jlab.org>, Dave Kashy <kashy at jlab.org>, Saptarshi Mandal 
<mandal at jlab.org>, Sabatie Franck <franck.sabatie at cea.fr>, CAZAUX 
Sandrine <sandrine.cazaux at cea.fr>, MANDJAVIDZE Irakli 
<irakli.mandjavidze at cea.fr>
CC:     Ball Jacques <jacques.ball at cea.fr>, Latifa Elouadrhirs 
<latifa at jlab.org>


Hi Amrit

I need an answer on the Si interconnect boxes.
Please could you take care of this quickly for we cannot design µm 
barrel connection.

Best
Stephan


-----Message d'origine-----
De : Aune Stephan
Envoyé : vendredi 10 décembre 2010 10:46
À : 'Mac Mestayer'; Amrit Yegneswaran; Dave Kashy; Saptarshi Mandal; 
Sabatie Franck; PROCUREUR Sébastien; CAZAUX Sandrine
Cc : Ball Jacques; Latifa Elouadrhirs
Objet : Urgent: answer on Si interconnect boxes

Hi Amrit

Like we said in the last meeting we have a issue with the interconnect 
boxes of the Si, it prevent us from connecting our first 3 µm layers and 
also gives few space for the mechanics from our barrel tube to the 
forward mechanics.
You explained that the Si cable length was around 500 mm.
At what distance can you move the Si interconnect boxes ?

Also we asked in the telephone meeting (11-9-2010) if the seize 
(thickness) of the boxes where optimized.
They are actually drawn with 2 inch thick. Since each mm gain in the 
boxes thickness is an extra mm for the µm electronic volume (this on all 
the length) for forward (constrain by CTOF due to neutron guide) it is 
important to optimize now the boxes volume.

We need those information to pursue the 3D design on the barrel.
Could you please check ASAP.
Thanks

Stephan