Concepts for New Recycler Lambertons

GW Foster

Dec 2000

Concepts for New Recycler Lambertons

GW Foster Dec 2000

YOU CAN NEVER BE:

• Too Thin

• Too Rich

• Have too much Aperture

for Beam Transfers

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

Recycler Lambertson

Recycler LambertsonField Map

Recycler Lambertson Specifications

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”

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

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un

its

at 1

")

Calc. Skew Quad

Calc. Skew Octupole

As-Built (approx)

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.

Copper Plated Steel

Field Free Region

BendRegion

Stainless Vacuum Bridge

BrazeJoints

New LambertsonSeptum And Vacuum Pipe

Welded Stainless Skin Option

Vacuum Flange at Ends(Brazed or Welded)

Pole Tip For Permanent Magnet

Machined Steel Base Plate for Lambertson

Permanent Magnet Ferrite(3 Layers for B~0.3T)

Steel Cover Plates

New Recycler Lambertson?