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Abstract
We report on a method to tune the focal length of high resolution neutron MIEZE spectrometers. The MIEZE technique relies on a fast sinusoidal neutron intensity modulation up to the MHz range, generated by the rotation of the neutron spin in radio-frequency spin flippers, and subsequent conversion to an intensity modulation by a spin analyzer. This intensity modulation is washed out due to the neutron velocity dispersion, but by proper choice of the spin rotation frequencies as well as the distances between sample, detector and spin flippers, a focal point in space appears (echo point), where the neutron detector is placed. In this work, we describe how to extend the dynamic range of the MIEZE technique by several orders of magnitude by introducing a field subtraction coil (NSE coil), such that at low energy resolution a good overlap with conventional spectroscopy techniques is achieved. All formulas for calculating the tuning parameters and an experimental example from the RESEDA spectrometer at the Heinz Maier–Leibnitz Zentrum (MLZ) are discussed.
Highlights
Modulation of intensity with zero effort (MIEZE) is a neutron spectroscopy technique with high energy resolution, closely related to the established neutron spin echo (NSE) method
We report on a method to tune the focal length of high resolution neutron MIEZE spectrometers
We describe how to extend the dynamic range of the MIEZE technique by several orders of magnitude by introducing a field subtraction coil (NSE coil), such that at low energy resolution a good overlap with conventional spectroscopy techniques is achieved
Summary
Modulation of intensity with zero effort (MIEZE) is a neutron spectroscopy technique with high energy resolution, closely related to the established neutron spin echo (NSE) method. By introducing an additional DC coil (NSE coil, figure 1) in between the RSFs the resolution range is significantly extended This coil is a solenoid, with field axis parallel to the neutron beam. It effectively subtracts field int egral and increases the resolution range to short Fourier times (τMIEZE) by several orders of magnitude [5]. We derive the dependence of the intensity contrast on the current in the NSE coil These results are compared to data recorded using the LMIEZE option of the resonant spin echo spectro meter RESEDA [6, 7] at the Heinz Maier–Leibnitz Zentrum in Garching, Germany
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