On the calculation of the neutron adiabatic spin-flipper

Luschikov, V.I.; Taran, Yu.V.

doi:10.1016/0168-9002(84)90025-1

Cited by 16 publications

(10 citation statements)

References 1 publication

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“…11 Instead of changing the H 1 rotation frequency, however, the idea was to give the holding field B 0 a monotonic gradient. Then, as a neutron travels through the region of non-zero B 1 , its Larmor precession frequency due to B 0 is always either increasing or decreasing (depending on the direction of travel).…”

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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“…Applying spin flips with a transverse oscillating magnetic field to reverse the polarization, one can remove all magnetic contributions which are independent of the gas polarization, such as fluxgates offsets or a misalignment of the magnetometers' axes with B 0 . This well-known technique, called "adiabatic fast passage" [27], requires a spin-flip coil and a RC circuit resonating at the Larmor frequency, corresponding to a 80 µT holding field. An extension of this method to spin-flip polarized 3 He confined in a cell may be found in Ref.…”

Section: B Direct Polarimetrymentioning

confidence: 99%

Constraining short-range spin-dependent forces with polarizedHe3

et al. 2015

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We have searched for a short-range spin-dependent interaction using the spin relaxation of hyperpolarized 3 He. Such a new interaction would be mediated by a hypothetical light scalar boson with CP -violating couplings to the neutron. The walls of the 3 He cell would generate a pseudomagnetic field and induce an extra depolarization channel. We did not see any anomalous spin relaxation and we report the limit for interaction ranges λ between 1 and 100 µm: gsgpλ 2 ≤ 2.6 × 10 −28 m 2 (95 % C.L.), where gs(gp) are the (pseudo)scalar coupling constant, improving the previous best limit by 1 order of magnitude.

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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%

“…Neutron beam monitors M1, M2, and M3 are parallel plate 3 He ionization chambers filled with an admixture of 3 He, 4 He, and N 2 to a total pressure of one atmosphere [15]. The stable and linear neutron beam monitor M1 is used to normalize the neutron beam intensity pulse by pulse with 1% accuracy.…”

Section: Description Of the Apparatusmentioning

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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On the calculation of the neutron adiabatic spin-flipper

Cited by 16 publications

References 1 publication

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

Constraining short-range spin-dependent forces with polarizedHe3

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

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