Update on Alignment kit and Stave 250 frameand thoughts for Stave 130

M.Gibson (RAL)2/5/13*Status of the frame for stave 250Status of infrastructure for stave 250 testingStave 130 stuff

Status of Stave 250 Frame*Reminder of what the frame looks likeConstraints Length (to fit in CERN freezer)Thickness ( to go with bridges)Thickness ( cos of the DC/DC cans)Thickness (for ease of covers)Offsets for bridgesOffsets for wire bondingOffsets for electrical reasons.Changes in length because of temperature excursions.

Stave 250 frame*Fixed ref groovesSpring loaded groovesGas connectionsreference pin holesclampswallsFinal Positioning of the walls can only happen after wereceive the stave.This is because I have only got +- 1mm travel on adjusters and we have so far never had a stave that had a kapton that was the correct length.

Test box for stave 250 or similar*Double glazed window( two sheet of polycarbonate)topbaseCable/pipework entry and exitFabricated from aluminium faced 19 mm thick foam. Edges sealed with epoxy or aluminium tape with electrically conductive glue.

*Thermal breakFoam seal

Layout for R12*Pipe entryRoute(to stop any condensation dripping onto mains!Bottle regulatorAccess around both sides of box

On the current alignment systemUpgrading the bridges by replacing one of the plastic components with ones of stainless steel.(done)

Upgrading the vacuum jigs by preloading the balls that control the XY link between the top and bottom jigs. (Now tried using elastic bands so it needs to be productionized)

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For Stave 130*Working on a new manual pick up jigOld version for modules with a large inter-hybrid gapNew version forModules with a small inter-hybrid gapReady for gluing togetherVacuum cups fit down the middleAwaiting vacuum cups( same as previous design)Vacuum cup fit along the edges

New Transfer JigDesigning a new transfer jig to take the guesswork out of the aligning of the module to the vacuum jig. Same system as we used in previous version of ATLAS with retractable reference edges. *

Homely statements about stave(lets) 130 in its various formsSome obvious statements.In the future since we are manufacturing both r-phi and uv stave(lets) we will need to make both styles of jigs. For this we will need to be sure just what the rotate actually is, and that means a set of drawings that we all agree to and manufacture to!

Official drawing effort will be required to update the existing module placement drawings or to make new ones as appropriate.

3) Need a decision about frames and the way forwards but officially

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New frame concept*1) By separating out the two frames we can progress faster.

2) By only adding the expensive items when needed we save money cos you do not need so many. Expensive items

3) You still need the stave slider

4) The box is now very simple

5) The down side is that you cant access both side at the same time

6) You need to move the stave from one to the other but you only need to do this once in production. And with core with C channels its not too difficult.

7) The handles need to be compatible with both frame types.

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