Algorithm of the Computer Modelling and a SESANS Setup with Adiabatic RF-Flippers
Wicher Kraan (TU Delft - RST/Neutron and Photon Methods for Materials)
V.N. Zabenkin (Petersburg Nuclear Physics Institute (PNPI))
LA Axelrod (Petersburg Nuclear Physics Institute (PNPI))
Yu.O. Chetverikov (Petersburg Nuclear Physics Institute (PNPI))
SV Grigoriev (Petersburg Nuclear Physics Institute (PNPI))
E.G. Yashina (Petersburg Nuclear Physics Institute (PNPI))
A.A. Sumbatyan (Petersburg Nuclear Physics Institute (PNPI))
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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 A, 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.