mice- afc unit mechanical design of the cold mass support system oxford university rohan senanayake
TRANSCRIPT
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MICE- AFC UnitMechanical Design of the
Cold Mass Support System
Oxford University
Rohan Senanayake
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Complete Assembly
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General Arrangement of the cold mass support system
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An Overview of AFC Unit
1. Cold Mass– Bobbin
– G10 Insulation
– Focusing Coils
– Cover Plate/Mounting brackets for Cold Mass
2. Copper Shield
3. End Plates and Cylindrical Core
4. Cold Mass Support System
5. Warm Vessel
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Bobbin G10 Insulation Focusing Coil
Bobbin with G10 Insulation and Focusing Coils
Coil Cover Plate with Cold Mass Support Brackets Cold Mass
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Cold Mass
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Copper Shield
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End Plates and Cylindrical Core
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Cold Mass, Support System and the Warm Vessel
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Section View of the Complete Assembly
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Cold Mass Support System• 4 sets of Links anchored to the Cold Mass and Outer Casing to carry an Axial load on Cold Mass of 200 KN. Each link is pre-
tensioned to 50 KN when cold.
• Each pair of links is skewed relative to each other to provide torsional stiffness
• Each Link is made of 2 Glass fiber Epoxy (E-Glass) links and one stainless steel link cooled to 500K. All the links and the cold mass support system are linked through stainless steel pins.
• Anchor point on the outer casing includes a mechanism to pre-tension the links and help to align the cold mass accurately
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Arrangement of the links to provide Torsional Stiffness
Vertical Plane
450 Plane
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Warm Vessel/ Outer Casing
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Components of the Cold Mass Components of the Cold Mass Support SystemSupport System
• E-Glass Straps• Stainless Steel Block• Stainless Steel Shear Pins• Integrated Tensioning Device/ Anchor on warm
vessel• End Cap• Mounting Bracket for Cold Mass Support
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Complete Link
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E Glass Strap Stainless Steel Block
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Components of the Integrated Tensioning Device/ Anchor on warm vessel
The device also prevents twisting of the link during the tensioning operation.
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Mounting Brackets on the Cold Mass
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Integrated Tensioning Device/ Anchor on warm vessel
End Cap welded to form a vacuum tight joint.
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Pre -Tension Control
T = 0.2 Fi dp
T – Torque in N-m
Fi – Tension in support link KN
dp – pitch diameter of thread mm
Tension KN Torque N-m
37.5 300
50.0 400
62.5 500
Example
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One turn of the nut moves the screw (cold mass) through one pitch. Pitch of screw = 2 mm
Therefore one turn of the nut moves the corresponding mounting point of the cold mass through 2 mm
Position Control of Cold Mass
A table showing the relationships between angular and radial positions of the cold mass centre line and rotation of the adjustment nuts will be compiled. This can be used during the assembly/ setup
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Summary statement
The design on the Cold Mass support system is adequate to take on the imbalance magnet force while allowing independent adjustment of the position of cold mass
Further work
Dip in the vessel shell under tension load:Manual calculations indicate a deflection of 0.5mm. A FE analysis will be done and the anchor points will be strengthened locally if necessary
Shrinkage during vacuum:Would this shrinkage reduces the pre-tension load?
Table of the adjustment of the individual cold mass support link to the positioning / alignment of the magnet.
These will be ready by the next collaboration meeting in October.