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Title: High-efficiency Resonant rf Spin Rotator with Broad Phase Space Acceptance for Pulsed Polarized Cold Neutron Beams

Journal Article · · Physical Review Special Topics - Accelerators and Beams
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  1. Los Alamos National Laboratory (LANL)
  2. Arizona State University
  3. University of Michigan
  4. University of Tennessee, Knoxville (UTK)
  5. University of New Hampshire
  6. Indiana University
  7. University of California
  8. National Institute of Standards and Technology (NIST)
  9. University of Manitoba, Canada
  10. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
  11. Hamilton College, New York
  12. University of California, Berkeley
  13. University of Manitoba & TRIUMF, Canada
  14. University of Dayton, Ohio
+ Show Author Affiliations

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 NPD Gamma experiment, a search for the small parity-violating {gamma}-ray asymmetry A{sub Y} in polarized cold neutron capture on parahydrogen, is one example. For the NPD Gamma experiment we developed a radio-frequency resonant spin rotator to reverse the neutron polarization in a 9.5 cm x 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 {sup 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 NPD Gamma experiment are considered.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
DE-AC05-00OR22725
OSTI ID:
937539
Journal Information:
Physical Review Special Topics - Accelerators and Beams, Vol. 11, Issue 8; ISSN 1098-4402
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ASYMMETRY
COLD NEUTRONS
DESIGN
EFFICIENCY
ENERGY RANGE
NEUTRON BEAMS
NEUTRONS
PHASE SPACE
PHYSICS
POLARIZATION
SPALLATION
SPIN
SPIN FLIP
STANDARD MODEL