Specifying the voltage

There is now a single option to specify whether we provide the voltage (in Volt) or electric field (in V/m). The syntax is as follows:

field_given_by = <voltage,field,voltage_table,field_table> <value>

For example:

# To apply a voltage of 34 Volts
field_given_by = voltage 34

# To apply a background field of 0.25e7 V/m, which is internally converted into a voltage
field_given_by = field 0.25e7

# To apply a time-dependent voltage given in file_name.txt
field_given_by = voltage_table file_name.txt

# To apply a time-dependent background field given in file_name.txt
field_given_by =  field_table file_name.txt

The voltage or field table should have the following structure:

voltage_vs_time (or field_vs_time)
--------
t0 v0
t1 v1
... ...
--------

For the sake of backward compatiblity (with earlier versions of the code), the field (in V/m) can still be specified by field_amplitude.

Applying a voltage pulse

The code has the functionality to generate trapezoid-shaped pulses, by specifying the pulse rise/fall time, width, period and the number of pulses (default=1).

field_pulse_width = <time in seconds>. This is the pulse width excluding the pulse rise and fall time. By default, we have a pulse width of infinity, i.e., the voltage/field value is constantly applied throughout the duration of the simulation.
field_num_pulses = <integer number of pulses>. The number of pulses, by default one.
field_rise_time = <linear rise and fall times of the pulse (seconds)>. By default, this value is 0 sec.
field_pulse_period = <total duration of the pulse, including the off-time in sec>. Make sure that this value is larger than the "pulse on time" (field_pulse_width + 2*field_rise_time), else the code will exit with an error message.

Please look at the .cfg file programs/standard_2d/streamer_cyl_2pulses.cfg for an example on how to setup and run a simulation with 2 pulses.

Table of Contents

Specifying the voltage

Applying a voltage pulse