1. RFSPIN FLIPPER DESIGN For nHe-3 experiment at SNS

2. Original Spin Flipper Design 0.7 inch thick Aluminum Shell 4 nylon outer quadrants wrapped in 18 AWG solid wire Nylon Inner Cylinder wrapped in 18 AWG solid wire Length~15.75 in. Outer diameter ~ 16 in. Cross-section

3. 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=0 B B=0

4. 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.

5. Outer Quadrants • Original 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)

6. 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?

7. 3D Printing Companies materialise

8. CAD Drawing of an Outer Quadrant

9. Another CAD Drawing • Quadrant with interlocking ends. • Price quote from Shapeway’s at $550.00 • Quadrant is only half of the required length

10. Cross-Section of Outer Quadrant • Each quadrant has: • 93 grooves on the outer surface • 120 grooves on the inner surface

11. Test Piece Printed at UK • High Resolution Print took about an hour to print • Printed correct groove spacing on outside of outer quadrant

12. 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

13. Big Problem with Current Design Inside 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

14. 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).