Development of Time of Flight Modulation of Intensity by Zero Effort for Larmor

Master thesis (2018)

Authors

N. Geerits Applied Sciences

Contributors

J. Plomp (mentor)
W.G. Bouwman (mentor)
S.W.H. Eijt (mentor)
N.H. van Dijk (mentor)
Faculty
Applied Sciences, Applied Sciences
Copyright: © 2018 Niels Geerits
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Published Date

18-10-2018

Language

English

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Faculty

Applied Sciences

Abstract

A time of flight MIEZE spectrometer, which employs radio frequency spin flippers with square pole shoes and a magnetic yoke is presented. These flippers can achieve higher fields than conventional resonant RF flippers, which employ an air core. High fields are crucial for the construction of a high resolution and compact MIEZE spectrometer. Setups using conventional and novel flippers are constructed for comparison and a variety of experiments to characterize MIEZE instruments. Evidence is presented which indicates that high field flippers are capable of generating a 100kHz MIEZE signal comparable to that obtained with a conventional setup. Furthermore the need for a fast and thin detector is demonstrated. In addition the shape of the MIEZE focal spot is determined to be Gaussian. Finally the importance of stable timing for time of flight MIEZE is demonstrated. This research is relevant for the implementation of MIEZE on the Larmor instrument at ISIS pulsed neutron source in the UK.

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