ZEUS Microvertex Detector Patch Box and Cabling Information at 24/11/2000

Janet Fraser - UCL. See also Oxford Pete Shield, Oxford Physics Central Electronics Dept.
and John Hill Oxford Physics Design Office.

Pete Shield's Patchbox page - Conceptual Design and Patchbox Module Status Reports for each Component

Where do all the cables go? - Leo Wiggers web pages

Cable Entry and Clamping Scheme for Patch Boxes
Pete Shield's diagram of how cables will fit into the patch boxes (25.04.2000)

Here is a list of CABLES from the MVD to the Patch box and from the Patch box to the crates in the Vetowall area
please let me know if there are any changes to this list
NEW - Here is a link to lists of cables to and from the HELIX Driver
Here is a list of COMPONENTS for the Patch Box Modules
this list shows all components needed by Pete Shield - please send info where needed!

Combo Cable RJ45 Connector info from Leo Wiggers:
RJ45 connector diagram
RJ45 connector cabling - signals list

Zipper Tube Web Page - contact Herr Lampert

FINAL version of Combo cable 'ZIPPER TUBE'
29th November 2000 - this is now with latest RCAL - GG dimensions . Note that the triangular iron sections are still 60x60mm from the corners of the RCAL gap
Here is an update of the drawing of the GG/RCAL area with Combo cables in 'zipper tube' of the type now being used for combo cable bunching at NIKHEF.
The dimensions of the bunches containing 5 Combo cables wrapped in 'zipper tube' are 26mm x 5mm approx.
This can be compared with the previous type which measured 26mm x 8mm .
The difference is due to the absence of the plastic zip and its covering, together with a braid which is less thick. An adhesive strip replaces the zip. The combo cables will need to be flat within the tube in order for the bunches to fit in the restricted areas around GG magnet/RCAL and in the C5 area.

ZIPPER TUBE TRIALS:
5th June 2000
A 4 meter length sample from ZIPPER-TECHNIK - ZTZ-16-SH1/63-B tube was tested at UCL.
5 model combo cables were enclosed on the tube (using the tip of a ball-point pen as the special tool was not available!!).

First observations:
The inside diameter of the tube is 16mm so a bunched set of 5 cables fits easily with room to spare but the outside diameter of the tube is 20 x 18mm. The zip edge and the shielding braid causes the extra width, ie 20mm. Here is a photo of the end of the zipper tube.
The tube is fairly stiff and bending is easier with the zipper edge on the outside of the bend. A bend radius of 30mm is possible if forced but a radius of 65 would be the safest maximum. See photo of cable with bends.
Unfortunately the tube becomes buckled when bent, so the precise diameter cannot be maintained, thus much more space is occupied on bends. Note variation in diameter.

CONCLUSIONS:
see below for latest drawing (15.06.2000)
GOOD: zippertube is strong and unlikely to come apart even when bent over a radius of 65mm. Although stiff, it can be bent through the necessary radii en-route from MVD to patch boxes.

BAD: zippertube enclosing 5 combo type cables occupies much more space than formerly allocated. If the 5 cables are placed in a row inside the tube then the flat profile takes up 10 x 25mm (the zip and enclosed braid causing the extra thickness). The new profiles of cable bunches enclosed in zippertube have been added to the drawing of the combo cables in the GG magnet area.(see the yellow rectangle and circle top left). There are no very sharp bends on the combo cable route but there will be some buckling due to changes in direction so packing factor will vary en-route
. Obviously the tube can be 'squashed' to a certain extent as cables do not fill it, but the extra material takes up a lot of space. On the other hand, if a smaller diameter version of the same tube type was available, enclosing the cable tightly would make it less flexible.
The cable bunches become heavier and will need a very strong 'cage' to keep them in place away from the C5 detector.

07.06.2000 update:
If zippertube is squashed flat, with cables carefully laid flat inside it it is posssible that several cables could be laid in layers to take up marginally less space. Here is a sketch of the flattened zippertube.Note that this can only work in straight sections where cable does not have to bend.

09.06.2000
Here is the drawing of the cable route through the RCAL/GGmagnet space, modified to give an idea of how the combo cables enclosed in this type of zippertube would fit in, (section at top) compared with former arrangement (section at bottom).Note how space is filled completely!. Also note that the zippertube is squashed flat and would have to be held in position with a very strong 'cage' in order to keep the 'low profile'!

15.06.2000
This is the latest drawing of cables bundled in zippertube showing at top - tube squashed flat and at bottom - round tube 19mm diameter - same tube not squashed flat.
NOTE that this does not fit in the space available.

Comments/Verdict from Pete Shield re zippertube impact on Patch Box entry and from John Hill and Brian Payne re impact on installation will appear here as soon as they are received.

please note change to patch box names
- as viewed looking into the interaction region, they are from top left going clockwise ABCD

A new full-scale model layout of the Combo cables from the MVD rear outer flange to the surfaces of the Patch boxes furthest away from the Cryotower has been made. Patchboxes A and C are shown (the NORTH or Rucksack side of the ZEUS Hall). The barrel cables are bunched in sets of 5 per zipper tube and the wheel cables buched in sets of 4 per zipper tube. Here 5 cables of similar diameter to the Combo Cable are bunched in plastic tubing as we do not yet have samples of the real zipper tube
Note that a hemisphere of the MVD rear flange and each patch box are modelled in 3D. Cables curve from the flange to their routes above and below the beampipe and stay in the same plane until clear of the GG magnet when they curve out to each patchbox
Other cable bundles will lay either side of the modelled cable bunches to form two sets, one above the beampipe and one below it. They will stay in the same configuration from the MVD rear flange to the patchboxes without crossing over each other (ie without any rerouting)
The measured length of the cables from their exit point on the MVD flange to patchboxes B, C and D is now 3.5 meters and to patchbox A 3.4 meters. The cables enter each patchbox through an opening in the surface facing the MVD, in the corner nearest the beampipe in each case.

Note that the final positions of the patchboxes were agreed in January 2000
Here is the rear section of the same layout

Here is the view from the SOUTH side of the ZEUS Hall, with patchboxes B and D
Here is a sketch of the four patchboxes and cable route from the MVD
- The Combo cables have to go through very restricted areas en route to the Patchboxes.
  Here is a drawing of the area inside the RTD when the C5 counter is being installed. The cables have to be supported on the inside of the RTD wall to allow for the two halves of the C5 to be assembled round the beampipe.
  A special adjustable support is being designed at Oxford. Here is a drawing of the area after the C5 has been installed. The cables are allowed to move closer to the c5,away from the RTD inner wall.
  A model was made of the C5 inside the RTD but cables and pipe positions have now changed.
  After the RTD, the next restricted area is inside the RCAL as the available space is almost filled by the GG magnet. Here is a drawing of a cross-section though the RCAL, cables and GG magnet
  Note that the triangular sections (magnet shielding) are situated only in the rear, inactive section of the RCAL.
  
  The Oxford drawings of the Patch Box dimensions and positions can be found here - look at the Patch Box Section.
  - Here is a list of experts concerned with cables/services etc going through the Patch Box area.
  TJF / tjf@hep.ucl.ac.uk /latest update 24th November 2000