When the Geometry option has been chosen a new menu is presented to the user, with different options. The main options are: Electrodes, Dielectrics, MgO, and Permittivity and correspond respectively to the definitions of the electrode position and dimensions, dielectric layer shape including barrier ribs, values of the secondary emission coefficients on the dielectric surfaces, and values of the permittivity of the dielectric layers and ribs. These options are described below.
A video example of the electrodes definition can be seen here: Electrodes VIDEO
After clicking on the Electrodes option, the user must chose between two options corresponding respectively to a graphical and a numerical definition of the position and size of the electrodes.
If the Define Graphically option has been selected, the user can create an electrode, move it, and adjust its position and size with the mouse.
Electrodes can be defined on the left, right, top or bottom sides of the simulation domain. To create a new electrode, click on the graphic window, in the black bagkground, outside of the simulation domain and on the side (left, right, top, bottom) where the electrode must be created. An electrode is created after clicking. Move it to the desired position on the side of the domain keeping the left mouse button pressed and release the mouse button. The dimension of the electrode can then be adjusted by clicking on one edge of the electrode and moving the mouse with the button pressed (see the illustrations below and the Electrodes VIDEO).
If the Define Numerically option has been selected, the user can define or modify the electrode position and size on each side of the simulation domain by numerical inputs. The user must enter in a table (see figure below) the positions of the two edges of each electrode. If the positions given by the user do not coincide with nods of the computational grid, the closest nods will be chosen by the SIPDP-AC. The user can visualize the position of these nods by clicking on the Adapt to Grid button. This is illustrated in the animation Electrodes VIDEO.
It is possible to insert some electrodes inside the left dielectric layer. This can be done only in the Define Numerically option (see above). Several electrodes can be inserted, but they can only be in the same x plane. The grid position of the electrodes in the x (horizontal) direction must be fixed (and larger than 2, 1 corresponding to the left border of the domain).
Electrode numbering is used for example to define the voltage on each electrode in the Data menu.
Electrode numbering is counter-clockwise from the bottom left on the domain, as illustrated below.
A video example of the dielectric layers definition can be seen here: Dielectrics VIDEO
After clicking on the Dielectric option, the user must select a rectangle dielectric domain (already existing or new) with the mouse. This domain must be adjacent to an already exisiting domain, or be in contact with the left or right side of the simulation domain. Dielectric domains attached to the left or right side of the simulation domain cannot overlap.
See the illustrations below or the Dielectrics VIDEO
A video example of the MgO layer definition can be seen here: MgO VIDEO
After clicking on the MgO option, the user must select a portion of the surface a dielectric domain with the mouse. After the mouse button has been released the user is prompted to enter the relative value of the secondary emission coefficient for that surface element. The values of the secondary emission coefficient on the selected surface element will be equal to the values defined in the data form (for each ion) multiplied by the relative value enterd in the dialog box. The relative values are indicated on the left side of the windows, with different colors corresponding to each surface element defined by the user.
See the illustrations below or the MgO VIDEO.
A video example of the Permittivity definition can be seen here: Permittivity VIDEO
After clicking on the Permittivity option, the user must select a rectangular domain in the dielectric layers or barrier ribs. After the mouse button has been released a dialog box appears and the user is prompted to enter the value of the relative permittivity of that part of the dielectric domain. The relative values of the permittivity are indicated on the right side of the windows, with different colors corresponding to each volume element of the dielectric layer defined by the user
See the illustrations below or the Permittivity VIDEO.
