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MuH.py
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MuH.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 MuH(IFunction1D):
def category(self):
return "Muon\\MuonSpecific"
def init(self):
self.declareParameter("A0", 0.5, 'Amplitude')
self.declareParameter("NuD", 0.5, 'Oscillating Frequency (MHz)')
self.declareParameter("Lambda", 0.3, 'Exponential decay rate')
self.declareParameter("Sigma", 0.05, 'Gaussian decay rate')
self.declareParameter("Phi", 0.0, 'Phase (rad)')
def function1D(self, x):
A0 = self.getParameterValue("A0")
NuD = self.getParameterValue("NuD")
Lambda = self.getParameterValue("Lambda")
sigma = self.getParameterValue("Sigma")
phi = self.getParameterValue("Phi")
OmegaD = NuD * 2 * np.pi
gau = np.exp(-0.5 * (x * sigma) ** 2)
Lor = np.exp(- Lambda * x)
return A0 * gau * Lor * (1 + np.cos(OmegaD * x + phi) + 2 * np.cos(0.5 * OmegaD * x + phi) + 2 * np.cos(1.5 * OmegaD * x + phi)) / 6
FunctionFactory.subscribe(MuH)