SPARK3D User Manual
Analyzing Multipactor results

Multipactor configuration provides the input breakdown power threshold of the selected regions of the structure. The simulation process can be followed in the Results configuration window, where a sweep in input power is shown as the simulation runs, indicating how the simulator tries to approach to the Multipactor breakdown threshold level.

The existence of results in a Multipactor configuration is emphasized by the Results tree icon, which is highlighted when there are results and is dimmed otherwise.

Multipactor configuration results can be analyzed in its corresponding results window, which can be opened:

Output

The multipactor module provides the input power breakdown threshold per carrier of the selected regions of the structure. The simulation process can be visualized in the info window of the main SPARK3D canvas, where a sweep in input power is shown as the simulation runs, showing how the simulator tries to approach the breakdown threshold.

Multipactor results are given both in tabular and graphic form. They can be seen in run-time through the results window, which looks as follows:

There are two tables and one graph:

  1. The left hand side table shows for each analyzed power whether there has been breakdown or not. When breakdown occurs for a certain input power, the multipactor order is given in the second column of the table whereas when there is no breakdown the message "No break" appears.
  2. In the graph it is represented the electron evolution with time for each power analyzed. This way it is easy to follow the increase/decrease of the electron population as the simulation runs. When left-clicking on the cell corresponding to a certain power of the left hand side table, its corresponding curve is highlighted on the graph for a better recognition.
  3. The upper table contains the threshold breakdown power for each region under study. Through this table the user can handle the results shown both in the left hand side table and the graph:
    • By left-clicking on a cell corresponding to a particular region both the graph and the left hand side table update their values to the current region.
    • By right-clicking on a cell corresponding to a particular region an option "Show 3D Stats" appears. This option launches a paraview window and shows the position of the electrons in the structure, and the 3D stats (if enabled in the configuration window (see Configuration window)).
    • By left-clicking on the cell corresponding to the signal value, the whole row is selected and a bar diagram appears in the graph comparing the threshold breakdown power for all regions. With this information it is easy to recognize which is the most critical region for Multipactor and the maximum power level supported by the device.

 

 

The data represented in the graph can be saved into an image file or a CSV file by using the right-click options "Export to Image" and "Export to CSV" on the graph.


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