[Central_tracker] SVT electronics' location (L1 disconnect)

[Marc McMullen]

Hi All,

The attached .pdf shows the keepouts for both the SVT detector (140mm 
radially from target center) and the keepout boundaries for the level 1 
disconnect for the SVT electronics (175mm radially, and 700mm upstream 
of target center).

Thanks
Marc

Mary Ann Antonioli wrote:
> 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
>
>
>
>
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>   
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