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PCRmagRedfield.py
35 lines (28 loc) · 1.15 KB
/
PCRmagRedfield.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 PCRmagRedfield(IFunction1D):
def category(self):
return "Muon\\MuonSpecific"
def init(self):
self.declareParameter("A0", 0.2, "Amplitude")
self.declareParameter("Delta", 0.2)
self.declareParameter("Nu", 0.2)
def function1D(self, x):
A0 = self.getParameterValue("A0")
Delta = self.getParameterValue("Delta")
Nu = self.getParameterValue("Nu")
W = 2 * np.pi * Delta
Q = (Nu**2 + Delta**2) * Nu
if Q > 0:
Lambda = Delta**4 / Q
else:
Lambda = 0
return A0 * (1.0 / 3 + 2.0 / 3 * np.exp(-Lambda * x) * np.cos(W * x))
FunctionFactory.subscribe(PCRmagRedfield)