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E. Jericha, S. Baumgartner, J. Bosina, P. Geltenbort, M. Hino, W. Mach, T. Oda, G. Badurek:
"First performance of travelling wave neutron magnetic spin resonators";
Talk: VI European Conference On Neutron Scattering (ECNS2015), Zaragoza; 08-30-2015 - 09-04-2015.

Magnetic spin resonance in spatially alternating magentic fields allows us to influence polarised neutron beams with regard to their spectral distribution and their time structure [1]. In pulsed operation of such resonators we may produce an almost arbitrarily shaped temporal substructure of the neutron beams. The flexibility is significantly increased when realising the pulsed magnetic field as magnetic travelling wave [2]. Here, we introduce the first technical realisations of such travelling wave resonators and present first experimental results obtained with thermal neutrons at the TRIGA reactor of the Atominstitut at the Vienna University of Technology and with very cold neutrons at the PF2-VCN instrument of the Institut Laue-Langevin, Grenoble. The current development is mainly motivated by its potential application in novel neutron instrumentation. Among the envisaged applications are the neutron beta decay experiment PERC for the high-precision characterisation of the weak interaction by neutron beta decay as well as the ultra-flexible tailoring of polarised neutron beams at the upcoming European Spallation Source ESS. The experimental results presented will highlight the inherent potential of these neutron resonators with regard to their intended applications.
[1] C. Gösselsberger et al., J. Phys.: Conf. Ser. 340 (2012) 012028.
[2] C. Gösselsberger et al., Physics Procedia 42 (2013) 106.