RFSPIN FLIPPER DESIGNFor nHe-3 experiment at SNS

Original Spin Flipper Design0.7 inch thick Aluminum Shell

4 nylon outer quadrants wrapped in 18 AWG solid wire

Nylon Inner Cylinder wrapped in 18 AWG solid wire

Cross-section

Length~15.75 in.Outer diameter ~ 16 in.

Double Cosine Theta Coils• Basic Idea of a cosine theta coil is to produce a

constant transverse B-field inside the coil.

• A single cos-theta coil will do this but also produce a non-zero field on the outside of the coil.

• you need two coils to produce a net field of zero outside the device.

B

B=0

B=0

Inner cylinder• Nylon Cylinder has been made

• Still need to machine grooves along the cylinder

• An improved design will also have ends machined to easily route wires.

Outer QuadrantsOriginal Outer Quadrants were machined incorrectly

Possibilities for new outer quadrants:• Submit CAD Drawings to 3D Print companies

• Bore out new nylon material and apply 3D printed strips with adhesive.

• Smooth out original nylon outer quadrants and apply 3D printed strips with adhesive (May lose precision here)

3D Printing

• Extrusion diameter roughly ¼ diameter of 18 AWG solid wire for printer at UK

• Price of 3D printed object based mass of material used and not on intricate design.

• Can send STL files over the internet to 3D print companies who will professionally build your product.

• 3D printing is slow.

• UK has 3D printers. Does UT have 3D printers?

3D Printing Companies

Company Focus Materials Max build size(in) Delivery time Shipping

Hobbyists, Designers 12 Types 28" x 15" x 23" 10-21 Days Interational, Included

Artists, Designers 13 Types 24" x 20" x 24" 5-15 Days International, Included on orders>$99

Industry, Engineers, Inventors 20 Types 36" x 24" x 36" 3-5 Days International

Hobbyists, Designers 35 Types 27" x 25" x 22" 1-3 Days International, Not included

Industry, Engineers, Inventors 4 Types 24" x 20" x 24" 4-10 Days International, Not included

Hobbyists, Engineers 6 Types 19.3" x 15.4" x 7.8" 1-7 Days International, not included

Hobbyists, Designers 11 Types 19" x 19" x 19" 14-21 Days International Not Included

Industry, Engineers 18 Types 36" x 24" x 36" 5-10 Days International Not Included

materialise

CAD Drawing of an Outer Quadrant

Another CAD Drawing

• Quadrant with interlocking ends.

• Price quote from Shapeway’s at $550.00

• Quadrant is only half of the required length

Cross-Section of Outer Quadrant

Each quadrant has:

• 93 grooves on the outer surface

• 120 grooves on the inner surface

Test Piece Printed at UK• High Resolution Print took about an hour to print

• Printed correct groove spacing on outside of outer quadrant

Another Test Piece Printed at UK• Square grooves cannot be used on inside of outer

quadrant at high density groove spacing

• Circular grooves must be truncating for a reasonable 3D print

Big Problem with Current DesignInside of outer cylinder

outside of inner cylinder

• Measured diameter of 18 AWG wire is 0.040-0.043 inches

• Machined grooves have diameters 0.045 inches

Other Problems with Design• Do we need metal end plates for the spin flipper(need drawings).

• Solid 18 AWG wire has a natural bend radius which must be designed into the device.

• No design information on how the inner and outer cylinders will be attached to each other (need drawings).

• No design information on how spin flipper coils are mounted to the Aluminum shell (need drawings).

• No design information on how spin flipper wires will be connected and routed to electronics(need drawings)

• Completed spin flipper will be “fragile”. Need a device to transport spin flipper without damaging it (need drawings).