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E. Jericha, H. Abele, G. Badurek, Ch. Gösselsberger, S. Nowak:
"Neutron beam tailoring by means of a novel pulsed spatial magnetic spin resonator";
Poster: Joint annual meeting of the Swiss and Austrian Federal Physical Society, Lausanne, CH; 15.06.2011 - 17.06.2011.

The passage of polarised neutrons through a spatially alternating transverse magnetic field is leading to individual spin rotation frequencies depending on the neutron velocity and the period of the alternating field. If this frequency equals the Larmor frequency, determined by the static guide field in the rest frame of the neutrons, a resonant spin flip will take place. This effect is used to single out a specific wavelength from an initially polychromatic polarised neutron beam. We present a novel design of such a resonator, named MONOPOL, which provides rapid electronic switching to allow for a fast chopping of the neutron intensity [1]. Both the selected wavelength and the respective wavelength resolution can be changed in an instant and the time structure of the neutron pulse modified almost arbitrarily. Implementation to the PERC project [2], searching for new physics beyond the Standard Model of particle physics via the beta-decay of free neutrons, will lead to a high count rate and give rise to a unique flexibility in triggering the standard machine parameters by purely electronic means. Moreover, such a flexible device may readily find applications in elastic and inelastic neutron scattering instruments. Here, we present promising first results of a resonator-prototype.
[1] G. Badurek, C. Gösselsberger, E. Jericha, doi:10.1016/j.physb.2010.09.023.
[2] D. Dubbers, H. Abele, S. Baeßler, B. Märkisch, M. Schumann, T. Soldner, O. Zimmer, Nucl. Instr. Methods A 596 (2008) 238.