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Implement outer BCs for 2D simulation
In this commit boundary condition are implemented for 2D electrostatic simulation. One can give "potential" value for `xmin`, `xmax`, `ymin` and `ymax` boundaries. This feature is demonstrated in `klayout_package/python/scripts/simulations/xsection_cull_with_boundaries.py`
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klayout_package/python/scripts/simulations/xsection_cull_with_boundaries.py
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| # This code is part of KQCircuits | ||
| # Copyright (C) 2023 IQM Finland Oy | ||
| # | ||
| # 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 3 of the License, 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, see | ||
| # https://www.gnu.org/licenses/gpl-3.0.html. | ||
| # | ||
| # The software distribution should follow IQM trademark policy for open-source software | ||
| # (meetiqm.com/developers/osstmpolicy). IQM welcomes contributions to the code. Please see our contribution agreements | ||
| # for individuals (meetiqm.com/developers/clas/individual) and organizations (meetiqm.com/developers/clas/organization). | ||
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| import sys | ||
| import logging | ||
| import argparse | ||
| from pathlib import Path | ||
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| from kqcircuits.pya_resolver import pya | ||
| from kqcircuits.simulations.export.simulation_export import export_simulation_oas | ||
| from kqcircuits.simulations.export.elmer.elmer_export import export_elmer | ||
| from kqcircuits.simulations.export.xsection.xsection_export import create_xsections_from_simulations, \ | ||
| separate_signal_layer_shapes | ||
| from kqcircuits.simulations.waveguides_sim import WaveGuidesSim | ||
| from kqcircuits.util.export_helper import create_or_empty_tmp_directory, get_active_or_new_layout, \ | ||
| open_with_klayout_or_default_application | ||
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| parser = argparse.ArgumentParser() | ||
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| parser.add_argument('--flip-chip', action="store_true", help='Make a flip chip') | ||
| parser.add_argument('--n-guides', nargs="+", default=[1, 2, 3], | ||
| type=int, help='Number of waveguides in each simulation') | ||
| parser.add_argument('--p-element-order', default=3, type=int, help='Order of p-elements in the FEM computation') | ||
| parser.add_argument('--london-penetration-depth', default=0.0, type=float, | ||
| help='London penetration depth of superconductor in [m]') | ||
| parser.add_argument('--etch-opposite-face', action="store_true", help='If true, the top face metal will be etched away') | ||
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| args, unknown = parser.parse_known_args() | ||
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| # This testcase is derived from waveguides_sim_compare.py and | ||
| # provides an example of how to use the XSection tool to produce cross section simulations. | ||
| # | ||
| # Simulation parameters | ||
| sim_class = WaveGuidesSim # pylint: disable=invalid-name | ||
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| multiface = args.flip_chip | ||
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| path = create_or_empty_tmp_directory(Path(__file__).stem + "_output") | ||
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| cpw_length = 100 | ||
| sim_box_height = 1000 | ||
| sim_parameters = { | ||
| 'name': 'xsection_cull_with_boundaries', | ||
| 'box': pya.DBox(pya.DPoint(-cpw_length/2., -sim_box_height/2.), pya.DPoint(cpw_length/2., sim_box_height/2.)), | ||
| 'cpw_length': cpw_length, | ||
| 'face_stack': ['1t1', '2b1'] if multiface else ['1t1'], | ||
| 'etch_opposite_face': args.etch_opposite_face, | ||
| 'n_guides': 1, | ||
| } | ||
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| boundary_conditions = { | ||
| 'xmin':{ | ||
| 'potential':0 | ||
| }, | ||
| 'ymax':{ | ||
| 'potential':0 | ||
| } | ||
| } | ||
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| workflow = { | ||
| 'run_gmsh': True, | ||
| 'run_gmsh_gui': True, | ||
| 'run_elmergrid': True, | ||
| 'run_elmer': True, | ||
| 'run_paraview': True, # this is visual view of the results which can be removed to speed up the process | ||
| 'python_executable': 'python', # use 'kqclib' when using singularity image (you can also put a full path) | ||
| 'elmer_n_processes': -1, # -1 means all the physical cores | ||
| 'elmer_n_threads': 1, # number of omp threads | ||
| } | ||
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| mesh_size = { | ||
| 'vacuum': 100, | ||
| 'b_substrate': 100, | ||
| # 'b_signal_1': 1, | ||
| # 'b_signal_2': 1, | ||
| # 'b_signal_3': 1, | ||
| 'b_simulation_ground': 4, | ||
| 'ma_layer': 0.02, | ||
| 'ms_layer': 0.02, | ||
| 'sa_layer': 0.02, | ||
| 't_substrate': 100, | ||
| 't_simulation_ground': 4, | ||
| } | ||
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| # Get layout | ||
| logging.basicConfig(level=logging.WARN, stream=sys.stdout) | ||
| layout = get_active_or_new_layout() | ||
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| simulations = [sim_class(layout, **sim_parameters)] | ||
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| for simulation in simulations: | ||
| separate_signal_layer_shapes(simulation) | ||
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| # Create cross sections using xsection tool | ||
| # Oxide layer permittivity and thickness values same as in double_pads_sim.py simulation | ||
| xsection_simulations = create_xsections_from_simulations(simulations, path, | ||
| (pya.DPoint(0, -8), pya.DPoint(0, -2)), # Cut coordinates | ||
| ma_permittivity=8.0, | ||
| ms_permittivity=11.4, | ||
| sa_permittivity=4.0, | ||
| ma_thickness=0.0048, | ||
| ms_thickness=0.0003, | ||
| sa_thickness=0.0024, | ||
| magnification_order=3, # Zoom to nanometers due to thin oxide layers | ||
| london_penetration_depth=args.london_penetration_depth, | ||
| vertical_cull=(-3,3), | ||
| ) | ||
| open_with_klayout_or_default_application(export_simulation_oas(xsection_simulations, path)) | ||
| export_elmer(xsection_simulations, | ||
| path, | ||
| tool='cross-section', | ||
| mesh_size=mesh_size, | ||
| boundary_conditions=boundary_conditions, | ||
| workflow=workflow, | ||
| p_element_order=args.p_element_order, | ||
| linear_system_method='mg') |