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# Copyright (C) 2005-2017 Massachusetts Institute of Technology
#
# This program is free software you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
from __future__ import division
import unittest
import meep as mp
class TestPhysical(unittest.TestCase):
def test_physical(self):
a = 10.0
ymax = 3.0
xmax = 8.0
dx = 2.0
w = 0.30
cell_size = mp.Vector3(xmax, ymax)
pml_layers = [mp.PML(ymax / 3.0)]
sources = [mp.Source(src=mp.ContinuousSource(w), component=mp.Ez,
center=mp.Vector3(-dx), size=mp.Vector3())]
sim = mp.Simulation(cell_size=cell_size,
resolution=a,
boundary_layers=pml_layers,
sources=sources,
force_complex_fields=True)
sim.init_sim()
sim.solve_cw(tol=1e-6)
p1 = mp.Vector3()
p2 = mp.Vector3(dx)
amp1 = sim.get_field_point(mp.Ez, p1)
amp2 = sim.get_field_point(mp.Ez, p2)
ratio = abs(amp1) / abs(amp2)
ratio = ratio ** 2 # in 2d, decay is ~1/sqrt(r), so square to get 1/r
fail_fmt = "Failed: amp1 = ({}, {}), amp2 = ({}, {})\nabs(amp1/amp2){} = {}, too far from 2.0"
fail_msg = fail_fmt.format(amp1.real, amp1, amp2.real, amp2, "^2", ratio)
self.assertTrue(ratio <= 2.12 and ratio >= 1.88, fail_msg)
if __name__ == '__main__':
unittest.main()
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