[Central_tracker] SVT and MVT interface.

Wed Dec 22 08:22:32 EST 2010

Hi everybody 

Thank you for the drawing.

The keep out zone drawn there is worse than what we showed in November (values obtain in September)

I do not know if the slides I presented during last review where studied but we came back some steps...

The good news is that after several years together we received, at last, some "drawing" (I put the quotation <http://www.mediadico.com/dictionnaire/anglais-francais/quotation/1>  mark <http://www.mediadico.com/dictionnaire/anglais-francais/mark/1>  for this is very light scheme) of keep out zone for SVT.

I send here a drawing from my last presentation, the µm tube start to reduce in diameter ( to allow flex cable fixation on detector) at 395 from target. I explained we where to tight there and we needed some extra mm more than the 395 mm.

On pdf you send the SVT tube stop at some 348 mm (no dimension there) so we "lost" some 45 mm !!!

I asked for a conical end, so sign of it.

In fact the boxes did not move backward, it just more detail on their location. Even if the maximum cable length between boxes and SVT front end is around 500 mm (dixit Amrit), the distance from cold plate to the first card is around 200 mm. Are you cable shorter than announced or will there be extra space needed to put the extra length of the cable !!  

Also the value for each disconnect boxe, obtain by rule of 3 out of a print..., given there are not  the one on Mary Ann mail.

I get around 672,604,543 instead of 700,670,640 on Mary Ann mail ? again we loose some 100 mm.

We cannot work on design without fixed interface. They change each time we have meeting or demands and our need seems not to be taken in account.

This is becoming at bit ridiculous.

Knowing both system need space and interface fixation;

I will stop the final design CAD study in Saclay on µm barrel until a preliminary design is finish on SVT connection and mechanics (with 3D model of the system). This "pause" is also de facto done on our electronics boxes location until CTOF last version, with space for neutron counter, arrives.

Stopping the design will impact on the whole planning (my critical path is on barrel detector).

This does not prevent us of working together to find the good interface solution for both system (if any, or the less worse if not).

Best regards

Stephan AUNE

View of space left for connection with conic tube starting at 245 mm from target.

How to connected our flex-PCB on first layer ? 

De : fsabatie at gmail.com [mailto:fsabatie at gmail.com] De la part de Franck Sabatie
Envoyé : mardi 21 décembre 2010 18:04
À : Aune Stephan
Objet : Fwd: [Central_tracker] SVT electronics' location (L1 disconnect)

t'as pas l'air dans la liste !

---------- Forwarded message ----------
From: Marc McMullen <mcmullen at jlab.org>
Date: Tue, Dec 21, 2010 at 5:05 PM
Subject: Re: [Central_tracker] SVT electronics' location (L1 disconnect)
To: Mary Ann Antonioli <antoniol at jlab.org>
Cc: central_tracker at jlab.org, sandrine.cazaux at cea.fr, irakli.mandjavidze at cea.fr

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

_______________________________________________
Central_tracker mailing list
Central_tracker at jlab.org
https://mailman.jlab.org/mailman/listinfo/central_tracker

_______________________________________________
Central_tracker mailing list
Central_tracker at jlab.org
https://mailman.jlab.org/mailman/listinfo/central_tracker

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/central_tracker/attachments/20101222/3b88a0c0/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 8040 bytes
Desc: image003.jpg
Url : https://mailman.jlab.org/pipermail/central_tracker/attachments/20101222/3b88a0c0/attachment-0001.jpe 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 10-14-18_3 reg 3 sensor_.3 gap_mm-Model.pdf
Type: application/octet-stream
Size: 160896 bytes
Desc: 10-14-18_3 reg 3 sensor_.3 gap_mm-Model.pdf
Url : https://mailman.jlab.org/pipermail/central_tracker/attachments/20101222/3b88a0c0/attachment-0001.obj 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Plan coupe ensemble - 2.jpg
Type: image/jpeg
Size: 222597 bytes
Desc: Plan coupe ensemble - 2.jpg
Url : https://mailman.jlab.org/pipermail/central_tracker/attachments/20101222/3b88a0c0/attachment-0001.jpg 