SPARK3D User Manual
Running Multipactor mode

In order to configure a Multipactor simulation, you must

 Multipactor configuration window will be opened.

From this window you can set up the configuration parameters. See Multipactor Analysis manual for a description of all the available options. In the configuration window, fill in

  1. Material name: Silver
  2. Precision (dB): 0.1
  3. Initial power (W): 9000
  4. Maximum power (W): 100000
  5. Initial number of electrons: 1000

In the left hand side of the window lies the Regions tree, where you can select which regions will be analyzed in the simulation. In our example, there are three already defined regions, which correspond to the central irises of the lowpass filter.

Press the Edit Regions button and a new window will be opened, where you can configure the analysis regions. 

You can see the defined regions of study for this example by clicking on the Visualize button. The 3D CAD viewer Paraview will open the EM field of the device together with the defined regions, represented by boxes. For further information on how to work with regions see Specifying Regions tutorial.

We are now ready to launch the simulation. Press the Run button in the MultipactorConfig window.

The simulation starts now and in the main window, the results window is opened so you can see the output in run-time.

For each analyzed region, the results include:

Multipactor output data also includes a table situated on the top of the window, where it is shown the breakdown power threshold for the regions under study. With this information it is easy to recognize which is the most critical region in the device for multipactor onset and the limiting power. For a detailed description on multipactor results interpretation read the Analysis of Results tutorial.

For the current example, we find that at the frequency of study, which is of 9.5 GHz, RectangularRegion 1 has the lowest breakdown power threshold, which is of 9210 W. Thus, this is the limiting power of the device.