Update on alignment kit and stave 250 frame

M.Gibson (RAL)

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Overall photo of the installation. and one bridge structure

Alignment laser

light strip for pin hole illumination

Prototype stavelet frame from QMUL One bridge structure

Two bridge structures sitting adjacent to each other at the correct spacing. one can see the Y and the combined X and theta adjusters

Y adjuster

Combined X and Theta

Fixed lower bridge

Moveable upper bridge to which is fixed the Y stage and vacuum jig

Detail of one bridge structure sitting over a prototype stavelet

This space required for side mounted SMD version

Detail of under granite store

Under granite store with one storage pod completed. Awaiting more bits from OM

Stave frame clamp base

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Fixed base

fulcrum

Lifting screw

Awaiting the clamp arms

Basic Vacuum Jig Components

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Top plate

Bottom plate

Edge supports

One of three vacuum cups and connectors

Two of 4 load springs

Bottom plate

Pillar to link jig to Y stage from underneath

Floating vacuum connection from lower jig to outside world

Ball joints

Free state of jig

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Fixed plate to provide X,Y and theta

Lifting plate to give Z

At maximum extension ball is entirely within the top plate

Contact to stave surface

Silicon edge to provide compression to on detector

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At typical compression extension ball is visible

Items still being worked on

• Awaiting delivery of the required wall components.(OM at RAL)

• Awaiting delivery of the required storage components (OM at RAL)

• Ivan is working on the software but see ‘current problems’

• The two part self aligning jigs are progressing, hopefully sticking and alignment trials next week

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Current Problems

• Unfortunately the aluminium section that supports the optics has a CTE that is too big. (It is also in Y the critical direction. The plan is to replace it with a simple fabricated Carbon Fibre (CF) box section using Pultruded CF square tubes and commercially available CF sheet .

• Sketch almost ready for construction.

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Frame for stave 250

Proposed stave 250 frame basic outline

Flexibles to accommodate changes in length as satve and frame are cooled

Swaglok self sealing quick release couplings

Movable clamp to hold stave cooling pipes

Working drawing soon to be passed out for comment to wire bonders, electrical testers etc. Frame

has top and bottom covers and the entire frame sits in an insulated box for testing purposes .

Other box related issues

• Material for the outer insulative box is at RAL. Aluminium faced panel with 25mm thick insulation (same as the current box but thicker) .Waiting for final sign off on stave 250 frame to get dims correct. Will have a double glazed window.

• Will be fabricated at RAL just like all the other boxes.

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Module Shipping

• I gather from Peter (P) that we will be receiving modules in at least 2 types of shipping boxes for stave 250. With frame and without frame

• I encourage you to make only ONE solution for the real thing. Because....

A) This minimises the chance of operator error (two boxes = double the chance of a mistake)B) we will need only ONE solution to the how to get from box to vacuum jig problemC) It will speed up the process.D) We should try and reduce the handling steps ‘cos they are always fraught!E) At least one of these current solutions means no electrical checking prior to mounting!

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