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RFresonance.py
34 lines (27 loc) · 1.28 KB
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RFresonance.py
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# Mantid Repository : https://github.com/mantidproject/mantid
#
# Copyright © 2019 ISIS Rutherford Appleton Laboratory UKRI,
# NScD Oak Ridge National Laboratory, European Spallation Source,
# Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
# SPDX - License - Identifier: GPL - 3.0 +
# pylint: disable=invalid-name, anomalous-backslash-in-string, attribute-defined-outside-init
from mantid.api import IFunction1D, FunctionFactory
import numpy as np
class RFresonance(IFunction1D):
def category(self):
return "Muon\\MuonSpecific"
def init(self):
self.declareParameter("A0", 0.2)
self.declareParameter("Boffset", 10, "Relaxation rate (G)")
self.declareParameter("B1", 10, "Fluctuation (G)")
self.declareParameter("B1GauWidth", 0.2, "Width of resonance (MHz)")
def function1D(self, x):
A0 = self.getParameterValue("A0")
Bcentre = self.getParameterValue("Boffset")
B = self.getParameterValue("B1")
width = self.getParameterValue("B1GauWidth")
gmu = 0.0135538817 * 2 * np.pi
Beff = np.sqrt(Bcentre**2 + B**2)
RelAmp = (B / Beff) ** 2
return A0 * (1 + (np.cos(Beff * gmu * x) * np.exp(-((width * x) ** 2)) - 1) * RelAmp)
FunctionFactory.subscribe(RFresonance)