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Concepts for New Recycler Lambertons
GW Foster
Dec 2000
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Concepts for New Recycler Lambertons
GW Foster Dec 2000
YOU CAN NEVER BE:
• Too Thin
• Too Rich
• Have too much Aperture
for Beam Transfers
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Lambertson Challenges
• Septum Width– Lamination die ~2x material
~0.125”
• Septum Straightness– Stacking– Overall Warpage
• Vacuum– Laminations have large area– Iron Rusts
• Bend Field– Iron Limit ~1 T– Perm. Mag. (Ferrite) Limit ~0.5T
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Recycler Lambertson
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Recycler LambertsonField Map
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Recycler Lambertson Specifications
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Specific Problems with Recycler Lambertsons
• Brick Trim of field shape (skew quad) not exact– ~1% skew quad field defect
• Gun Boring of Field-free region not very precise– Effective Septum Width ~0.2”– Septum extremely thin some
places
• Vacuum problems required Stainless beam pipe insert
• Overall Septum Width ~0.3”
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Trimming Skew Quad With Side Brick Position
Lambertson Field Defects vs. Side Brick Position
-200
-100
0
100
200
300
400
500
600
0 0.25 0.5 0.75 1
Side Brick Overhang Distance Below Pole Tip Surface (in.)
Cal
cula
ted
Fie
ld D
efec
t (
un
its
at 1
")
Calc. Skew Quad
Calc. Skew Octupole
As-Built (approx)
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New Lambertson Concepts
• Copper-Plated Steel to solve vacuum problems– (Suggested by Helen Edwards)
• Vacuum Shell: either– Brazed Connections to Stainless– Thin Stainless Skin on Insert
• Separates Vacuum & Septum design from Structure & Magnetics.
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Copper Plated Steel
Field Free Region
BendRegion
Stainless Vacuum Bridge
BrazeJoints
New LambertsonSeptum And Vacuum Pipe
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Welded Stainless Skin Option
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Vacuum Flange at Ends(Brazed or Welded)
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Pole Tip For Permanent Magnet
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Machined Steel Base Plate for Lambertson
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Permanent Magnet Ferrite(3 Layers for B~0.3T)
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Steel Cover Plates
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New Recycler Lambertson?