Algorithm of the Computer Modelling and a SESANS Setup with Adiabatic RF-Flippers

Authors:
W. H. Kraan, V. N. Zabenkin, L. A. Axelrod, Yu. O. Chetverikov, S. V. Grigoriev, E. G. Yashina, and A. A. Sumbatyan
The year of the publication:
2017
Journal:
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques N 6 vol. 11 1281–1288
Keywords:
Larmor precession, SESANS setup, adiabatic/RF flippers
Abstract:

We made software to simulate Larmor precession in a setup for SESANS with adiabatic/RF flippers in magnets, existing at PNPI. The final polarisation of a divergent “ribbon beam” of height 2 cm is calculated as a function of λ. For λ = 6 Å, flippers 56 cm apart and RF frequency 1 MHz we find spin-echo length δ = 0.9 μm. We show numerically, how λ is converted to δ. Extension to δ = 20 μm is realistic.

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