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sec_emission_model_from_file.py
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sec_emission_model_from_file.py
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#-Begin-preamble-------------------------------------------------------
#
# CERN
#
# European Organization for Nuclear Research
#
#
# This file is part of the code:
#
# PyECLOUD Version 8.7.1
#
#
# Main author: Giovanni IADAROLA
# BE-ABP Group
# CERN
# CH-1211 GENEVA 23
# SWITZERLAND
# giovanni.iadarola@cern.ch
#
# Contributors: Eleonora Belli
# Philipp Dijkstal
# Lorenzo Giacomel
# Lotta Mether
# Annalisa Romano
# Giovanni Rumolo
# Eric Wulff
#
#
# Copyright CERN, Geneva 2011 - Copyright and any other
# appropriate legal protection of this computer program and
# associated documentation reserved in all countries of the
# world.
#
# Organizations collaborating with CERN may receive this program
# and documentation freely and without charge.
#
# CERN undertakes no obligation for the maintenance of this
# program, nor responsibility for its correctness, and accepts
# no liability whatsoever resulting from its use.
#
# Program and documentation are provided solely for the use of
# the organization to which they are distributed.
#
# This program may not be copied or otherwise distributed
# without permission. This message must be retained on this and
# any other authorized copies.
#
# The material cannot be sold. CERN should be given credit in
# all references.
#
#-End-preamble---------------------------------------------------------
import os
import numpy as np
import scipy.io as sio
from numpy.random import rand
from .sec_emission_model_ECLOUD import SEY_model_ECLOUD
class SEY_model_from_file(SEY_model_ECLOUD):
def __init__(self, sey_file, flag_costheta_delta_scale, flag_costheta_Emax_shift,
E_th=None, sigmafit=None, mufit=None,
switch_no_increase_energy=0, thresh_low_energy=None, secondary_angle_distribution=None,
):
"""
- sey file is the path to a mat file of the correct format, either an absolute path or in the sey_files folder.
- if flag_factor_costheta is True, the SEY is increased depending on the angle with which the electrons are hitting.
Set to None or False to disable.
"""
self.E_th = E_th
self.sigmafit = sigmafit
self.mufit = mufit
self.switch_no_increase_energy = switch_no_increase_energy
self.thresh_low_energy = thresh_low_energy
self.secondary_angle_distribution = secondary_angle_distribution
if secondary_angle_distribution is not None:
from . import electron_emission
self.angle_dist_func = electron_emission.get_angle_dist_func(secondary_angle_distribution)
else:
self.angle_dist_func = None
if type(sey_file) is dict:
sey_properties = sey_file
else:
# Search for file with given name, either as an absolute path or in the dedicated folder
# Absolute path has precedence.
candidate_files = [
os.path.expanduser(sey_file),
os.path.abspath(os.path.dirname(__file__)) + '/sey_files/' + sey_file,
]
existing_files = list(filter(os.path.isfile, candidate_files))
if not existing_files:
raise ValueError('SEY file %s is not found' % sey_file)
sey_file_real = existing_files[0]
print('Secondary emission from file %s' % sey_file_real)
sey_properties = sio.loadmat(sey_file)
energy_eV = sey_properties['energy_eV'].squeeze()
sey_true = sey_properties['sey_true'].squeeze()
sey_elast = sey_properties['sey_elast'].squeeze()
extrapolate_grad_true = float(sey_properties['extrapolate_grad_true'].squeeze())
extrapolate_const_true = float(sey_properties['extrapolate_const_true'].squeeze())
extrapolate_grad_elast = float(sey_properties['extrapolate_grad_elast'].squeeze())
extrapolate_const_elast = float(sey_properties['extrapolate_const_elast'].squeeze())
diff_e = np.round(np.diff(energy_eV), 3)
delta_e = diff_e[0]
if np.any(diff_e != delta_e):
raise ValueError('Energy in file %s is not equally spaced.' % sey_file_real)
# sey_diff is needed by the interp function
# A 0 is appended because this last element is never needed but the array must have the correct shape
self.sey_true_diff = np.append(np.diff(sey_true), 0.)
self.sey_elast_diff = np.append(np.diff(sey_elast), 0.)
# This merely populates the object namespace
self.energy_eV = energy_eV
self.sey_true = sey_true
self.sey_elast = sey_elast
self.sey_file = sey_file
self.flag_costheta_delta_scale = flag_costheta_delta_scale
self.flag_costheta_Emax_shift = flag_costheta_Emax_shift
self.energy_eV_min = energy_eV.min()
self.energy_eV_max = energy_eV.max()
self.delta_e = delta_e
self.extrapolate_grad_true = extrapolate_grad_true
self.extrapolate_const_true = extrapolate_const_true
self.extrapolate_grad_elast = extrapolate_grad_elast
self.extrapolate_const_elast = extrapolate_const_elast
def SEY_values(self, E_impact_eV, costheta_impact):
delta_true = np.zeros_like(E_impact_eV, dtype=float)
delta_elast = np.zeros_like(E_impact_eV, dtype=float)
mask_fit = (E_impact_eV > self.energy_eV_max)
mask_regular = ~mask_fit
delta_true[mask_regular], delta_elast[mask_regular] = self.interp(E_impact_eV[mask_regular])
delta_true[mask_fit] = self.extrapolate_const_true + self.extrapolate_grad_true * E_impact_eV[mask_fit]
delta_elast[mask_fit] = self.extrapolate_const_elast + self.extrapolate_grad_elast * E_impact_eV[mask_fit]
if self.flag_costheta_Emax_shift:
# recompute Delta True
E_impact_eV_scaled = E_impact_eV / (1. + 0.7 * (1. - costheta_impact))
mask_fit = (E_impact_eV_scaled > self.energy_eV_max)
mask_regular = ~mask_fit
delta_true[mask_regular], _ = self.interp(E_impact_eV_scaled[mask_regular])
delta_true[mask_fit] = self.extrapolate_const_true + self.extrapolate_grad_true * E_impact_eV_scaled[mask_fit]
if self.flag_costheta_delta_scale:
factor_costheta = np.exp(0.5 * (1. - costheta_impact))
delta_true *= factor_costheta
delta_true[delta_true < 1e-10] = 0. # We get rid of negative values
delta_elast[delta_elast < 1e-10] = 0. # We get rid of negative values
delta = delta_true + delta_elast
ref_frac = 0. * delta
mask_non_zero = (delta > 0)
ref_frac[mask_non_zero] = delta_elast[mask_non_zero] / delta[mask_non_zero]
return delta, ref_frac
def SEY_process(self, nel_impact, E_impact_eV, costheta_impact, i_impact):
yiel, ref_frac = self.SEY_values(E_impact_eV, costheta_impact)
flag_elast = (rand(len(ref_frac)) < ref_frac)
flag_truesec = ~(flag_elast)
nel_emit = nel_impact * yiel
return nel_emit, flag_elast, flag_truesec
def interp(self, energy_eV):
"""
Linear interpolation of the energy - SEY curve.
"""
index_float = (energy_eV - self.energy_eV_min) / self.delta_e
index_remainder, index_int = np.modf(index_float)
index_int = index_int.astype(int)
return self.sey_true[index_int] + index_remainder * self.sey_true_diff[index_int], self.sey_elast[index_int] + index_remainder * self.sey_elast_diff[index_int]
def interp_regular(self, energy_eV):
#This fails if the input is not in ascending order.
#return np.interp(energy_eV, self.energy_eV, self.sey_parameter)
raise ValueError('Warning! Do not use interp_regular!')