MICE Collaboration Meeting at Frascati, Jun 26~29, 2005

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MICE Collaboration Meeting at Frascati, Jun
2629, 2005
Diffuser Mounting Design
Stephanie Yang
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Positional requirement of Diffuser
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The task To design a mechanism that allows the
insertion and mounting of the lead diffuser into
the inner bore of the tracker module without
having to disturb the mounting arrangement of the
PID components The tight space (about 140mm gap)
between the fibre tracker patch panel and the
Iron shield is such that it makes the mounting
operation awkward and unreliable This design
employs a mechanism that is user friendly and
guarantees the positioning of the diffuser to the
required tolerance level Lets look at the design
principle of that mechanism
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Insertion of diffuser assembly caused the main
arm to be rotated, thereby extending the arm
mechanism
See animation in the next 9 pages on how this
works
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The original arrangement
The Knife edge flange mounted on the top of the
patch panel cover plate
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Confirmation was sought from our collaborator on
Fibre Trackerand
Imperial College
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Patch Panel module Drawing received from Geoff
Barber in Imperial Collage on 23rd Jun, 2005
Courtesy of Geoff Barber
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Adaptive Knife-edge flange mounting on the end
plate of the tracker module
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The need to feed the fibres from the fibre
tracker out to the patch panel requires extra
radial space. As a result, we have to modify the
top-hat design to accommodate both the diffuser
and the extra room for the fibre feed through.
Space needed by the fibre
Radial space needed by the diffuser
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One of the solution for fixing the diffuser
mounting problem
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3D exploded view
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Summary We believe the diffuser works well. We
have made two prototype (a scaled model and a
full model) to demonstrate how the mechanism
works The need to liaise with other component
supplier is essential. In the case of the patch
panel we are pleased that we have identified the
problem at this early stage which saved us having
to redesign the diffuser mechanism although minor
modification was needed to keep both sides
happy Further improvement is still possible to
ease the handling of the diffuser if and when the
lead plate needs replacing