Discussion thread: "Data-driven analysis of breathing and ion-transit modes in 2D hybrid Hall thruster simulations"

[dmaddalo]

Hello everyone!

I just uploaded my slides for the Young researchers poster mini-session with title in object.

Please feel free to check it out and ask me any questions you may come up with.

[tarek-ben-slimane]

Hello Davide,
Very nice presentation and a nice article as well.
I have several clarifying questions if you don't mind. In the presentation you mention that the data was filtered. Did you use like a band-pass filter ? Also, it seems that at low voltage a third high frequency cluster at around (200 kHz) also appears that wasn't there in the nominal case. Is it also linked to the ITTI ?
Thank you very much :)

[dmaddalo]

Hello Tarek,
Thank you for your interest.
The data has indeed been filtered, but mostly in order to eliminate noisy contributions. For this purpose, a Singular Value Decomposition (SVD) routine has been carried out adopting an energy cut-off value close to the estimated level of noise and reconstructing the original dataset only with the retained modes.
The second cluster of frequencies that appear at lower voltage is indeed linked to the ITT dynamics as the dominant contribution in that cluster is an exact harmonic of the ITT main frequency (namely, twice as much). The loss of dominance of the breathing mode allows this second group of harmonics to become visible, whereas it got overwhelmed in the nominal case.

I hope I helped.

Best regards,

Davide