atlas pixel detector march 2004 video conference e. anderssen lbnl pp1 opto connector and fiber...

March 2004Video Conference

E. Anderssen LBNL

ATLAS Pixel Detector

PP1 Opto Connector and Fiber RoutingUpdated with notes from 23-March

Meeting

E. Anderssen, D. UkenLBNL

Opto-Connector Discussion


E. Anderssen LBNL

ATLAS Pixel DetectorPP1 Quarter Plate Change

• Feed Throughs and Ericsson Connector included in model now—changed penetration size

• Quarter plate Changed to allow easier assembly, better sealing (removed BPSS interface from quarter plate)

• Changed panel to fully mill-able part from a lot of EDM work

EricssonPP1 Opto-Connector

PP1 Electrical Feed-thrus


E. Anderssen LBNL

ATLAS Pixel DetectorConnections Extended

• Pipes and Opto connections extended to higher Z to avoid Wire routing Volume

• Extension is exterior (note this is old figure of opto-extension, see later slides for current rev.


E. Anderssen LBNL

ATLAS Pixel DetectorChanges since last review

• Penetration Flex Design finalized (production flexes in hand)• PP1 Opto Connector organizing hardware designed/fabricated• BPSS adjustors moved to higher Z as requested at BPSS PRR• Beam pipe Bellows and support designed and integrated

– Addition of Cruciform Support of PP1

R450


E. Anderssen LBNL

ATLAS Pixel DetectorTray Layout Symmetry

• Unwrapped layout of gap just outside of PP1—linear along red circle from previous slide

• Optocables come in inside Green circle• Have not yet figured length from R450 gap to Diamond

connectors—hope to do so in the coming week


E. Anderssen LBNL

ATLAS Pixel DetectorPP1 Opto-Routing

• Internal take up at pp1 fabricated• Opto-routing model developed• Take up allows common ribbon length• 4X10 layout matches cable modularity best• Connection extended past Wires


E. Anderssen LBNL

ATLAS Pixel DetectorOptical Services and Fiber Handling

• Three flavors of Optocard are required for the detector—Load Left/Right/B-Layer

– The B-Layer has all optopacks loaded for DTO– Barrel and Disk only need one– The loading removes the opto-packs from the extreme corners of the service panels—

the most significant (and fragile) extent of the service panel envelope

• This requires all B-Layer optocards to be loaded in the middle positions—important for connectivity tables later

Not Loaded


E. Anderssen LBNL

ATLAS Pixel DetectorInternal Fiber Ribbon Handling

• Ribbons are fully guided and radius controlled from PP0 to PP1

• Ribbon Take-up at PP1 accounts for differing ribbon lengths due to internal routing (185-11075mm variation)

• Integration of features internal to PP1, installed modularly with Service Panels

• Pre-production prototype of PP0/PP1 parts shown at left—made with process used for production manufacture

110

185


E. Anderssen LBNL

ATLAS Pixel DetectorFiber Organizing Tray

• Due to both routing requirements, and length tolerance required for multiple termination opportunities (3 allowed) variation in length of the fiber ribbons must be taken up.

– Up to 60mm is allowed for 3 shots to terminate the connectors (30mm per attempt)

– Routing requires up to 75mm variation (differing lengths between optocards at PP0)

• Fiber wrapped around inside tray once can vary in length based on whether it follows the inner most wall or outer most

– Longest path possible for one wrap is 375mm

– Shortest path (pulled ‘tight’ on inner radius guide) is 283mm

– Variation of 92mm possible for this configuration

• Fiber can also go straight thru, or use only one side of tray

– Straight Thru is 125mm length– Around one side max length is 200mm– Variation of 75mm for this

configuration

OD 73mmID 50mm

125mm Straight Thru


E. Anderssen LBNL

ATLAS Pixel DetectorFiber Lengths

240mm

1215

240

(110,185)

Optocards on

Underside of panel

And Inner Panel

240

290

85mm (max)

Two Sets—one for Outer service panel top (QTY 1/3)

One for OSP bottom, and ISP top (2/3)—long

Short (max length) =

185+1215+240+290+85+(extra pass) + (60) = 2260mm

Long = Short + 250 = 2510mm

Takes into account:

Extra pass around organizing tray 185mm @ ~58mm diameter

+60mm ‘tolerance’ for extra connector ‘shots’

Updated 23-Mar ‘04


E. Anderssen LBNL


Back shell

Fibre expansion chamber

Connector plate with 40

MF-B 16

Connector plate with

40MF-A 16

Convergence Agreed

• Proposal for Convergence• Diamond takes responsibility for two connector plates with MF-A/B 16

connectors, no seal, 4X10 array, same packing factor as used in prototypes shown above

• LBNL takes ‘backshell’ and ‘extension chamber’, integrating both internal fiber handling and taking responsibility for maintainable gas seal to ribbons

• Establish tighter interface sharing (iges or Pro/E models, SLA parts prototypes to designers on both ends Diamond/LBNL—direct if possible)


E. Anderssen LBNL

ATLAS Pixel DetectorSeal Plate and Extension tube

Seal blocks inserted and compressed

Internal Guide ribs organize ribbon and give ‘hoop’ strength for seal compression

Pockets in molded Silicone with pre-cast access slits—filled with ‘Apiezon-N’ Vacuum Grease (measured Rad-Tolerant)

Diamond Plate held at fixtured distance—allows plug-in of MT16 connectors, installation of seal

Cover Mechanically holds Diamond plate

PP1 plate

~67mm

Assembly order(reverse shown)


E. Anderssen LBNL

ATLAS Pixel DetectorSummary Diamond Connector Interface

• Diamond makes connector plates nominally 4X10

• Investigates possibility of using existing 4-wide connector, or adapting it to 4X10 array if size constraints can be met

• Prefer fully integrated 4X10 array similar to prototypes shown (cross between SLA part to left and part delivered to Georg by Diamond)

– Width of connector can increase some small value Order ~1cm

– Height of connector plate is less constrained—order of 2-3cm available if needed

– Should try to squeeze to minimum values where possible– LBNL/Dave will verify that this increase is possible, and

give an allowed value. – Negotiation possible after direct contact with Diamond is

available (sharing of model geometries)• Diamond should propose bolt and pin size and

locations required to assemble plates– More space is available top and bottom, space is tight on

sides– Features will be added to SLA expansion chamber parts

to allow full mechanical assembly of the plate to the SLA parts.

• Strength of SLA Parts will be analyzed– Would like an estimate of potential loads—I will guess,

but would like an independent estimate from someone from Diamond or Ericsson

– Design will be iterated, features added to meet strength requirements

• Schedule to follow budgetary/contract negotiations with CERN

– Will proceed with analysis of strength, but will put off any iterative work until contract is in place

– Sooner is better than later

Features for mechanical mounting to be added within red circles—wait for proposal from Diamond


E. Anderssen LBNL

ATLAS Pixel DetectorOriginal Opto-Connectivity—changed in pref to

4X10

• Each opto-ribbon

• Mapping of each opto-ribbon pair from Connector to PP0 position is identical per quadrant– Still true for 4X10

• Each ribbon is terminated with an MT8 on the Optocard side and an MT16 on the PP1 Side• Above is proposed numbering scheme for ribbons inside of cable

– Will use this, and try to incorporate coloring scheme from Ericsson in table—need this info still


E. Anderssen LBNL


Outer Service Panel Right

Inner Service Panel Right

Install First Install Second

Outer Service Panel Left

Inner Service Panel Left

Inner Service Panels Installed Simultaneously due to shared trays

SharedOrganizer

Trays

Order of A

ssembly


E. Anderssen LBNL

ATLAS Pixel DetectorOpto Connectivity Table—Per Quadrant


E. Anderssen LBNL

ATLAS Pixel DetectorConnectivity in table is by Opto Cable

• Columns for PP1 connector must be updated in table to represent 4/10 from 6/7—will do after decision to change is made

– Will begin work on this, as 4X10 design accepted• Rod information will be added to this table after it is extended to all quadrants

– Will happen following update to 4X10• Table has ability to map individual fibers—keeping track of which is dark, and

which is servicing what module.• Need to identify, in collaboration with Ericsson, a standard to identify

connectors, fiber-count, and labeling of production fiber ribbons, connectors, and cables—nominally done, but not documented—need in PO for Pigtails and Cables

– TBD—will look into standard proposed in SCT PRR documents

PP1 (Diamond)Connector 6/7

Opto-Cable DefinitionPP0/OptocardDesignation

Loca

l Su

pport

RibbonDesignation

atlas pixel detector march 2004 video conference e. anderssen lbnl pp1 opto connector and fiber...

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