Simulation Domain

Geometry  Option

1. Electrodes
   1. View 3D
   2. Define Electrodes
   3. Electrode Numbering
   4. Electrode Video
2. Dielectric Layers
   1. View 3D
   2. Define Dielectric
   3. Define MgO
   4. Dielectric Video

 

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• Simulation Domain

The sides of the simulation domain are noted: West, East, South, North, Bottom, Top, as shown below:

The axis are defined as follows:

X: from West to East

Y: From South to North

Z: from Bottom to Top

 

• Geometry  Option

  The Geometry Option is divided into two parts:

  Definition or viewing of electrodes

  Definition or viewing of dielectric layers (also definition of MgO on surfaces)

  

  These options are described below. 

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  1. Electrodes

  In the Electrodes Option of the Geometry menu option, one can define or only view the electrodes (in 3D).

  

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  1. View 3D

  An example of the view displayed in the View 3D option is shown below (click on the image to view an animation illustrating the use of the icons on the toolbar)

  

  The  , , ,   arrows in the vertical menu bar allow to rotate the simulation domain. The arrow is used to reset the axis to their default position.  The   button is used to exit this view mode.

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  2. Define Electrodes

  After clicking on the Define option of the  Electrode menu option, the grid and electrodes of the West (X=0) plane appear. 

  Electrodes can be defined on the left, right, south, north, top or bottom sides of the simulation domain. An example of electrode designing is shown in the  Electrodes VIDEO.

  

  The user can use the tools displayed in the vertical tool bar to modifiy the electrode geometry (change the shape, add a new electrode, delete one electrode ...). The horizontal menu can also be used in a straightforward way to select the side of the simmulation domain (Cube Side option), to select the electrode (Electrode # option). The View 3D option is very useful and can be used to visualize the simulation domain and electrodes in 3D, while designing the electrodes. 

  A maximum of three electrodes can be used on a side. The meaning of the icons on tool bar is indicated below:

  Click on this icon in the tool bar before defining a rectangular electrode area. Then click on the grid and define a rectangular area by moving the mouse (keeping the left mouse button down)

Click on this icon before erasing one (or part of an) electrode. Then click on the grid and define a rectangular area by moving the mouse (keeping the left mouse button down)

Go to the next side of the simkation domain. The order is: X-West ->W-East -> Y-South -> Y-North -> Z-Bottom -> Z-Top

Go to the previous side

Click on this icon to select the first electrode before defining its shape

Click on this icon to select the second electrode before defining its shape

Click on this icon to select the third electrode before defining its shape

When one of the 3 electrodes has been selected the background colour of the corresponding icon changes from grey to white (i.e. , when electrode 2 is selected). Also the colour of the selected electrode appears in the top left corner of the window. It is not possible to select electrode # 3 if electrode # 2 has not been defined prviously. 

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3. Electrode Numbering

Electrode numbering is made for the following order of the 6 sides of the simulation domain:

1) West, 2) East, 3) South, 4) North, 5) Bottom, 6) Top

For example if there are 2 electrodes on West side and 1 electrode on East side, electrode numbers on West side will be 1 and 2, electrode number on East Side will be 3. If there are 1 electrodes on West side, 1 electrode on East side, and 2 electrodes on North side, electrode numbers on West side will be 1 , on East Side will be 2., and on North side will be 3 and 4.

A colour code is used in SIPDP-3D (electrode definition menu, current-voltage graphics ...) to easily identify each electrode. This code is as follow:

electrode#1= yellow

electrode #2=cyan

electrode #3=magenta

electrode #4=green

electrode #5=red

electrode #6=blue

electrode #7=white

electrode #8=yellow

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2. Dielectric Layers

In the Dielectrics Option of the Geometry menu option, one can define or only view the dielectric layers (in 3D).

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1. View 3D

An example of the view displayed in the View 3D option of the Dielectric menu is shown below (click on the image below to see an animation illustrating this option)

The  , , ,   arrows in the vertical menu bar allow to rotate the simulation domain. The arrow is used to reset the axis to their default position.  

Click on the  and icon  to view the dielectric layers on one side only (east or west). 

The   button is used to exit this view mode.

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2. Define Dielectric

An example of the view displayed in the View 3D option of the Dielectric menu is shown below (click on the image below to see an animation illustrating this option)

 

There are two dielectric volumes. The first one (West Dielectric layer)  is based on side West, the second one (East Dielectric layer) is based on side East of the simulation domain. It is possible to define the dielectric layer shape and permittivity for each [X,X+dx] slice in the West or East dielectric. The icons on the vertical toolbar can be used to navigate  and to define the dielectric on the different [X,X+dx] slices. 

The arrows and of the tool bar are used to move to the previous or next [X,X+dx] slice.

The arrows and of the toolbar are used to move to the 1st or last [X,X+dx] slice respectively.

The arrows and of the toolbar are used to move to the previous or next [X,X+dx] slice and to copy the dielectric shape and permittivity of the displayed [X,X+dx] slice to the previous or next one.

Click on the icon before defining a rectangular dielectric area (with the current permittivity). Then click on a point in the X grid and draw a rectangle by moving the mouse (with the left button down).

 Click on the icon before defining an empty area inside a dielectric region. Then click on a point in the X grid and draw a rectangle by moving the mouse (with the left button down).

It is not possible to draw a cavity inside a dielectric layer. For the West side dielectric layer, this means that if a given area is empty (no dielectric) for a given X slice, it must also be empty for larger X. The code will impose that this conditions is satisfied, i.e., if an empty area is drawn at a given X (on the west side dielectric), the dielectric (if any) will also be removed for all  slices larger than X (on the west side). A symetric condition applies for the East side.

The icon can be used to define the permittivity of a given [X,X+dx] slice. Only one permittivity value can be used for each [X,X+dx] slice (but the permittivity can be change from one slice to another).

The current [X,X+dx] slice is indicated by a yellow colour on the 3D View which can be displayed during the design of the dielectric layer (see image below).

An example of dielectric layer construction can be found in the following animation: Dielectric Video 

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3. Define MgO

The values of the secondary emission coefficient for the different ions are defined in the Data Form.

In the  MgO option of the Dielectric option of the Geometry menu, it is possible to assign different values of the secondary emission coefficient on the top of the dielectric layers based on each side. 

After clicking on the MgO option the following form appears:

When 1.0 is chosen, the values of the secondary emission coefficients are the same as defined in the Data form. Otherwise the secondary emission coefficients defined in the Data form are multiplied by the relative coefficients defined here.

Note that in this version, the secondary emission coefficient is the same on all surfaces of a dielectric layer parallel to a given side (West, East, South, North, Bottom, Top) of the computational domain (but can be different for each side).

 

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