EQSANSResolution.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 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 +
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidAlgorithms/EQSANSResolution.h"
#include <cmath>
 
namespace Mantid::Algorithms {
 
// Register the algorithm into the AlgorithmFactory
DECLARE_ALGORITHM(EQSANSResolution)
 
/*
 * Double Boltzmann fit to the TOF resolution as a function of wavelength
 */
double EQSANSResolution::getTOFResolution(double wl) {
  if (wl > 2.0) {
    return 0.0148 * wl * wl * wl - 0.5233 * wl * wl + 6.4797 * wl + 231.99;
  } else {
    return 392.31 * pow(wl, 6) - 3169.3 * pow(wl, 5) + 10445 * pow(wl, 4) - 17872 * wl * wl * wl + 16509 * wl * wl -
           7448.4 * wl + 1280.5;
  }
}
 
} // namespace Mantid::Algorithms