The current flux monitor will calculate the total flux of the current density through a line, area or volume of the simulation region. In 2D, the currents are in units of A/m and in 3D they are in units of A.

The monitors returns the following:

$$I_{n,p}=\int_{\partial\Omega}\mathbf{J}_{n,p}\cdot\mathbf{n}\mathrm{d}\sigma$$

where J is the current density, n is the unit normal at the surface, and ∂Ω is the surface of the monitor

## Using the monitor

The following instructions can be helpful when setting up the monitor for your simulation:

- When the simulation region is 2D, you can choose a linear monitor (open conture: line) or a 2D monitor (closed conture). If 2D monitor is chosen, it has to be oriented to be in the simulation domain plane. The flux monitor results in a 2D simulation are in units of A/m. The results can be converted to A by multiplying the value by the norm length (which is set in the solver's General tab).
- When the simulation region is 3D, all types of flux monitor can be used: linear (open conture), 2D (plane or surface), or 3D (closed surface).

Note: Avoid placing the monitor exactly at the contact. If you need to compare the monitor results with those reported for the contact try moving the monitor slightly to avoid direct contact with the metal. |

## General tab

- MONITOR TYPE: The monitor geometry can be chosen. It can be a point, a line in any direction, a plane normal to any of the axis or a 3D monitor.
- RECORD DATA: Choose the data of interest to record, un-check unnecessary data to save momery requirement

## Geometry tab

- X, Y, Z: The center position of the simulation region
- X MIN, X MAX: X min, X max position
- Y MIN, Y MAX: Y min, Y max position
- Z MIN, Z MAX: Z min, Z max position
- X SPAN, Y SPAN, Z SPAN: X, Y, Z span of the simulation region
- USE RELATIVE COORDINATES: If this is enabled then the monitor will use the center or the CHARGE solver as its origin (reference). If disabled then it will use the absolute center (0,0,0) as its origin.

Note: The availability is based on the SOLVER TYPE |

## Results returned

- SURFACEFLUX: Current is returned as a function of emitter voltage and base voltage. In 2D, the currents are in units of A/m and in 3D they are in units of A.