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Transverse RF Spin Rotator for the n- 3 He experiment. Christopher Crawford University of Kentucky for the n- 3 He Collaboration n-3He Technical Review ORNL, TN 2013-01-08. Transverse RF spin rotator. Resonant RF spin rotator

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Transverse RF Spin Rotator for the n- 3 He experiment


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    1. Transverse RF Spin Rotatorfor the n-3He experiment Christopher Crawford University of Kentucky for the n-3He Collaboration n-3He Technical Review ORNL, TN 2013-01-08

    2. Transverse RF spin rotator • Resonant RF spin rotator • P-N Seo et al., Phys. Rev. S.T. Accel. Beam 11, 084701 (2008) • Properties suitable for n-3He expt. • Transverse horizontal RF B-field • Longitudinal or transverse flipping • No fringe field - 100% efficiency • Real, not eddy currents along outsideminimizes RF leaked outside SR • Doesn’t affect neutron velocity • Compact geometry • Matched to the driver electronicsof the NPDGamma spin flipper • Construction • Development in parallel with similar design for nEDM neutron guide field • Few-winding prototype built at Uky; Real RFSF being built now field lines end cap windings NPDGamma windings n-3He windings

    3. Inner / outer coil design • Windings calculated using scalar potential • Uniform transverse RF field inside • Zero leakage field enforced by B.C.’s • Copper wires run along equipotentials • Inner region: • Intermediate: • Outer region: • 4:1 inside / outside winding ratio • By choosing appropriate radii • Perfect cos theta windings inside & out • 48 inner loops of 18 AWG wire

    4. Status • Waiting for winding grooves to be machined in nylon forms

    5. Alternate winding patterns • Three possibilities all give same field in high-frequency limit INNER INNER/OUTER OUTER easiest to wind no eddy currents no copper in beam • All three wound using same grooves • R&D: test RF fields of each winding

    6. Electrical specifications • Holding field: • Resonant frequency: • Inductance: 4.5 mH • Capacitance: 7.5 nF • Resistance: 5.1 Ω • Maximum voltage: • Stored energy: • Dissipated power: • Quality factor: Q=151

    7. Electrical specifications • RF field strength depends time spent in RFSF. • High energy neutron beams (~20 meV) will be travelling upwards of 1000 m/s • These neutrons will spend approximately 398 microseconds inside the RFSF and need to rotate π-radians • Flip rate: • The maximum value of the required rotational field is then, • The maximum value of the required RF field is exactly twice this, • To produce this field, we calculate the maximum value of required current given the winding spacing of the inner coils. • Proportionally Constant: