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Zeitschriftenartikel:

G. Badurek, Ch. Hartl, E. Jericha:
"A non-conventional neutron polariser concept";
Nuclear Instruments and Methods in Physics Research A, 586 (2008), S. 95 - 99.



Kurzfassung englisch:
Even in an idealised case conventional methods of neutron polarisation inevitable loose at least 50% of the intensity by removing one spin state from the incident beam. We demonstrate, however, that it should be possible to polarise a pulsed beam of slow neutrons without loosing any particle. This so-called "Dynamical Neutron Polarisation" (DNP) method is mased upon acceleration and deceleration, respectively, of the two neutron spin states during passage through an NMR-like arrangement of crossed static and radiofrequency magnetic fields, followed by spin-dependent spin rotation in a homogeneous precession field. Precise ramping of the strength of this precession field synchronously with a time modulated π/2-spin turn device at the exit position allows to stop precession for all neutron wavelengths exactly at the moment where both spin states are alignet parallel, albeit on the cost of a tiny energy difference between them. We present a theoretical description of DNP which is essentially based upon a semi-classical spin-rotation formalism and present a typical result of a thorough investigation of the performance of such a non-conventional polariser with respect to a manifold of instrumental parameters

Schlagworte:
Neutron polarisers; Neutron spin precession; Neutron optics


"Offizielle" elektronische Version der Publikation (entsprechend ihrem Digital Object Identifier - DOI)
http://dx.doi.org/10.1016/j.nima.2007.11.051

Elektronische Version der Publikation:
http://publik.tuwien.ac.at/files/PubDat_169641.pdf


Erstellt aus der Publikationsdatenbank der Technischen Universitšt Wien.