TransientPropagation: add tests for impact ionization

# SPDX-FileCopyrightText: 2023 CERN and the Allpix Squared authors

# SPDX-License-Identifier: MIT

#DESC tests functionality of impact ionizations in high-field regions

[Allpix]

detectors_file = "detector.conf"

number_of_events = 1

random_seed = 0

[DepositionPointCharge]

model = "fixed"

source_type = "point"

position = 445um 220um 50um

number_of_charges = 1

# We use a custom field here to not trigger the warning about linear fields being inappropriate

[ElectricFieldReader]

model = "custom"

field_function = "[0]*z + [1]"

field_parameters = -30kV/cm/cm, -170kV/cm

[WeightingPotentialReader]

model = pad

[TransientPropagation]

log_level = DEBUG

temperature = 293K

charge_per_step = 1

timestep = 1ps

multiplication_model = "okuto"

multiplication_threshold = 100kV/cm

#PASS Calculated gain of 1.49596 for step of 106.418nm from field of 170.6kV/cm to 170.6kV/cm

 No newline at end of file

# SPDX-FileCopyrightText: 2023 CERN and the Allpix Squared authors

# SPDX-License-Identifier: MIT

#DESC checks that a warning is printed in cases the timestep is too coarse for impact ionization

[Allpix]

detectors_file = "detector.conf"

number_of_events = 0

random_seed = 0

[DepositionPointCharge]

model = "fixed"

source_type = "point"

position = 445um 220um 50um

number_of_charges = 1

# We use a custom field here to not trigger the warning about linear fields being inappropriate

[ElectricFieldReader]

model = "custom"

field_function = "[0]*z + [1]"

field_parameters = -110kV/cm/cm, -1000V/cm

[WeightingPotentialReader]

model = pad

[TransientPropagation]

log_level = DEBUG

temperature = 293K

charge_per_step = 1

multiplication_model = "okuto"

multiplication_threshold = 100kV/cm

#PASS (WARNING) [I:TransientPropagation:mydetector] Charge multiplication enabled with maximum timestep larger than 1ps\nThis might lead to unphysical gain values.

# SPDX-FileCopyrightText: 2023 CERN and the Allpix Squared authors

# SPDX-License-Identifier: MIT

#DESC tests generation of impact ionization charge carriers of opposite type

[Allpix]

detectors_file = "detector.conf"

number_of_events = 1

random_seed = 0

[DepositionPointCharge]

model = "fixed"

source_type = "point"

position = 445um 220um 50um

number_of_charges = 1

# We use a custom field here to not trigger the warning about linear fields being inappropriate

[ElectricFieldReader]

model = "custom"

field_function = "[0]*z + [1]"

field_parameters = -30kV/cm/cm, -190kV/cm

[WeightingPotentialReader]

model = pad

[TransientPropagation]

log_level = DEBUG

temperature = 293K

charge_per_step = 1

timestep = 1ps

multiplication_model = "okuto"

multiplication_threshold = 100kV/cm

#PASS Set of charge carriers ("h") from gain on (445.764um,219.457um,98.845um)