SPARK3D User Manual

Analysis of Multipactor Results

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In this tutorial the capabilities of SPARK3D GUI to handle and better analyze Multipactor results are shown. As general features you can find that:

- results are given both in tabular and graphic form for a better understanding and can be saved in .csv or .png format respectively;
- partial results can be seen in run-time, that is, both tables and graphs are updated as results are being obtained;
- the simulation process can be followed in the Power vs Order table.

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

There are two tables and one graph:

- 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.
- 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.
By right-clicking on the graph, you can save the graph in a .png file and its data, which correspond to the left-side table, in .csv format, respectively.

- The upper table contains the breakdown power threshold 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 element.
- By right-clicking on a cell corresponding to a particular region the option
**Visualize 3D statistics**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). - 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 breakdown power threshold 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.