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SFTPRO cycle,
measured on 12/11/04 at 9h49. No excitation.
It looks as not the whole beam was ejected to the SPS.You can here this hump.

Beam sound, H plane, 20-times stretched time scale, mono, ca 0.8MB, 26kS/s.




Magnitude spectra of the above signal are shown below for frequencies 50-150kHz. Each spectrum segment (5ms) is normalized separately. This is the reason for red regions for parts with small signal.






Cross-sections of the above plots at the moments specified, linear scale.





Cross-sections of the tune path in log scale. The spectra are normalized to the highest value in the cycle (usually this is at the injection).


(c) M.Gasior, CERN-AB-BDI. All rights reserved.