RF SPIN FLIPPER DESIGN For nHe-3 experiment at SNS

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 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

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 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)

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 materialise

CAD Drawing of an Outer Quadrant

Another CAD Drawing Quadrant with interlocking ends. Price quote from Shapeway’s at $ 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 Design Inside of outer cylinder outside of inner cylinder Measured diameter of 18 AWG wire is inches Machined grooves have diameters 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).