RF SPIN FLIPPER DESIGN For nHe-3 experiment at SNS
Feb 23, 2016
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).