mice collaboration meeting at frascati, jun 26~29, 2005 diffuser mounting design stephanie yang
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MICE Collaboration Meeting at Frascati, Jun 26~29, 2005
Diffuser Mounting Design
Stephanie Yang
S Yang, 26-Jun-2005 2
Positional requirement of Diffuser
1046 mm
1224.5 mm
z=0
-5951 mm
End Coil
120 mm
-6011 mm
-6014.8 mm
7.6 mm
-7758.5 mm
Diffuser position (relative to the centre of MICE in stage VI).
Q9
Diffuser
17-Jan-2005
5891 mm
250mm
Iron Shield
Patch panel
163mm
-6173mm
Courtesy of Paul Drumm
S Yang, 26-Jun-2005 4
Clearance envelop for the diffuser assembly approx. 150 mm
Diff
user
env
elop
whe
n fu
lly
with
draw
n
Pat
ch
pa
nel
Tracker solenoid
Iro
n s
hie
ldClearance gap = 250mm
Pat
ch
pa
nel
Tracker solenoid
Iro
n s
hie
ldClearance gap = 250mm
163 mm from flange face
The space constraint & positioning requirement
for the diffuser
95 mm
Diff
user
fully
ext
ende
d
The design as it
wasNow it has
changed!
S Yang, 26-Jun-2005 5
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
S Yang, 26-Jun-2005 6
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
S Yang, 26-Jun-2005 7
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S Yang, 26-Jun-2005 16
The Knife edge flange mounted on the top of the patch panel cover plate
The original arrangement
S Yang, 26-Jun-2005 17
NO NO NO! You are not serious! Nothing can touch my Patch
Panel.
Imperial College
Confirmation was sought from our collaborator on Fibre Tracker…………and…
S Yang, 26-Jun-2005 18
Patch Panel module Drawing received from Geoff Barber in Imperial Collage on 23 rd Jun, 2005
Courtesy of Geoff Barber
S Yang, 26-Jun-2005 19
Adaptive Knife-edge flange mounting on the end plate of the tracker module
S Yang, 26-Jun-2005 20
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.
Radial space needed by the diffuser
Space needed by the fibre
S Yang, 26-Jun-2005 21
One of the solution for fixing the diffuser mounting problem:
S Yang, 26-Jun-2005 22
3D exploded view
S Yang, 26-Jun-2005 23
S Yang, 26-Jun-2005 24
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