SPARK3D User Manual

First, the EM field data of the device under study must be loaded. From the Start working window, you can either create a new solution or open an existing one, in which the EM field is automatically loaded.

To create a new project, press the New Solution button and browse in the explorer to select a EM field file previously created with one of the SPARK3D compatible EM solvers (see EM field exportation). The different formats supported by SPARK3D include FEST3D, CST, HFSS, FEKO, each one with its corresponding file extension.

In this tutorial, you will load an existing example. Click on the Open examples button and select TutorialExamples folder, where you choose TUTORIAL_EXAMPLE.spkx.

A new window will appear with the information of the newly opened file. You see in the left side of the window the tree structure of the current solution, which includes a Model with four analysis regions, a multipactor configuration and a corona configuration, each one with its already existing results and a video configuration. Among the already defined regions of analysis, you can find the so called Circuit, which contains the imported EM field of the entire device, and three more regions defined for corona and multipactor analysis.

Once the EM files have been loaded, it is advisable to visualize the EM field through the 3D CAD viewer included with SPARK3D distribution, Paraview (more information on Kitware's Paraview can be found in

Click on the View model button of the toolbar and the main window of Paraview will open with the EM field previously computed inside the device, which looks like:

 With the left, right and center buttons of your mouse you can rotate, zoom and translate the camera view. In the menu bar there is a display list where the different fields (magnitude, real and imaginary parts of electric and magnetic fields) can be selected.

2D cuts allow you to visualize the fields inside the structure, so that you can detect the potential areas of the structure where the breakdown onset is more likely to occur, that is, where the electric field is maximum. You can create a 2D cut with the slice button  that is located in the menu bar.

In the figure below you see that the irises in the center of the device are the main candidates for breakdown onset.