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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. Length~15.75 in. Outer diameter ~ 16 in. Cross-section.

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rf spin flipper design

RFSPIN FLIPPER DESIGN

For nHe-3 experiment at SNS

original spin flipper design
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

double cosine theta coils
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

inner cylinder
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
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
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?
another cad drawing
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
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
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
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
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
other problems with design
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).