AdV-COM (AdV commissioning (1st part) )barsuglia - 17:14 Wednesday 04 January 2017 (35970)
Print this reportComment to SSFS noise injections (35962)In order to study the origin of the the double peak around 30 Hz, of the peak slightly below 40 Hz and of the peak slightly above 60 Hz (see plot 2, but also entry 35967), I have looked at the INJ system noise budget, as described in the documents VIR-0369A-15 and VIR-0212A-16 (Capocasa et al.). I have noticed that there are similar structures in the TF between the IB_tz control signal and the frequency noise (see for instance the attached plot, from VIR-0369A-15, but also the figure at pag.10 of VIR-0212A-16). In particular, the double peak around 30 Hz is clearly visible in the IB angular TFs. Of course this can be a coincidence, and moreover I don't know which is the mechanism allowing these structure to be present in the SSFS TF, but I think it is interesting to investigate better this point.
