An adiabatic resonance spin-flipper for thermal and cold neutrons

Баженов, А.Н.; Lobashev, V.M.; Pirozhkov, A. N.; Slusar, V.N.

doi:10.1016/0168-9002(93)90311-5

Cited by 50 publications

(22 citation statements)

References 3 publications

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“…In fact, practical adiabatic fast passage spin flippers have been constructed for use with UCN as well as thermal and cold neutron beams. 13 Reported efficiencies for such cold neutron flippers are = 0.99 ± 0.01 for a device used at the Nuclear Physics Institute in Saint-Petersburg (PNPI) in, among other things, neutron decay angular correlation measurements with cold neutrons, 13 and = 0.9993(1) (stat) for the flipper used with the PERKEO II spectrometer, 14 in which the highest precision measurement of the β asymmetry to date using cold neutrons was performed.…”

Section: B Figure Of Merit Considerations For Adiabatic Fast Passagementioning

confidence: 99%

A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

Holley

Broussard

Davis

et al. 2012

Review of Scientific Instruments

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A. T.; Broussard, L. J.; Davis, J. L.; et al., "A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment," Rev. Sci. Instrum. 83, 073505 (2012) The UCNA collaboration is making a precision measurement of the β asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron spin flipper capable of efficient operation in ambient magnetic fields on the order of 1 T. The requirement that it operate in a high field necessitated the construction of a free neutron spin flipper based, for the first time, on a birdcage resonator. The design, construction, and initial testing of this spin flipper prior to its use in the first measurement of A with UCN during the 2007 run cycle of the Los Alamos Neutron Science Center's 800 MeV proton accelerator is detailed. These studies determined the flipping efficiency of the device, averaged over the UCN spectrum present at the location of the spin flipper, to be = 0.9985(4).

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Section: B Figure Of Merit Considerations For Adiabatic Fast Passagementioning

confidence: 99%

A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

Holley

Broussard

Davis

et al. 2012

Review of Scientific Instruments

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“…The adiabatic resonance spin flipper is based on the principle described in Ref. [4], the DC-field gradient was produced by permanent magnets on a 0.3 m long wedge-shaped iron yoke producing a gradient from 120 to 210 G and the RF-coil was made of 30 Â 0.1 mm 2 Litz-wire wound with about 1 turn/mm over a length of 30 mm on a round 50 mm tube (the axis of the solenoid is the flight path of the neutrons). At I RF ¼ 2.5 A and a RF of 420 kHz (this is not the modulation frequency) we could flip more than 95% of the neutron polarization.…”

Section: The Experimentsmentioning

confidence: 99%

Quasi-elastic measurements using neutron spin flippers

Bleuel

Fitzsimmons

Lal

2008

Nuclear Instruments and Methods in Physics Research Section A:

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“…The condition of the adiabatic rotation is easy to meet at slow neutron energies and such a spin flipper is relatively easy to realize. Adiabatic rf spin flippers for neutrons were first used for ultracold neutrons [3,4] and later also for cold neutron beams [5,6]. The theory for their operation has been further developed to take into account higher-order effects from Berry's phase [7,8].…”

Section: Principles Of Operation Of Rf Neutron Spin Flippersmentioning

confidence: 99%

High-efficiency resonant rf spin rotator with broad phase space acceptance for pulsed polarized cold neutron beams

Seo¹,

Barrón‐Palos²,

Bowman³

et al. 2008

Phys. Rev. ST Accel. Beams

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High precision fundamental neutron physics experiments have been proposed for the intense pulsed spallation neutron beams at JSNS, LANSCE, and SNS to test the standard model and search for new physics. Certain systematic effects in some of these experiments have to be controlled at the few ppb level. The NPDGamma experiment, a search for the small parity-violating -ray asymmetry A in polarized cold neutron capture on parahydrogen, is one example. For the NPDGamma experiment we developed a radio-frequency resonant spin rotator to reverse the neutron polarization in a 9:5 cm 9:5 cm pulsed cold neutron beam with high efficiency over a broad cold neutron energy range. The effect of the spin reversal by the rotator on the neutron beam phase space is compared qualitatively to rf neutron spin flippers based on adiabatic fast passage. We discuss the design of the spin rotator and describe two types of transmission-based neutron spin-flip efficiency measurements where the neutron beam was both polarized and analyzed by optically polarized 3 He neutron spin filters. The efficiency of the spin rotator was measured at LANSCE to be 98:8 0:5% for neutron energies from 3 to 20 meV over the full phase space of the beam. Systematic effects that the rf spin rotator introduces to the NPDGamma experiment are considered.

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An adiabatic resonance spin-flipper for thermal and cold neutrons

Cited by 50 publications

References 3 publications

A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

A high-field adiabatic fast passage ultracold neutron spin flipper for the UCNA experiment

Quasi-elastic measurements using neutron spin flippers

High-efficiency resonant rf spin rotator with broad phase space acceptance for pulsed polarized cold neutron beams

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