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AdV-ISC (Commissioning up to first full interferometer lock)
casanueva - 11:59 Friday 13 July 2018 (42115) Print this report
Comment to 6MHz SNR study (42109)

Michal noticed that the spectrum of B2 6MHz which is not flat at high frequencies, suggests that the signal does not reach the sensing noise but still contains information. Making the coherence between the B2 8MHz (which is used for correcting the frequency noise since it has better SNR) and the B2 6MHz shows that at low frequencies and at high frequencies there are coherence between both, even though not at all bandwidths (Figure 1).

Figure 2 shows both the B2 6MHz and 8MHz error signal superposed. Notices that the B2 8MHz has a SNR for the SSFS of ~ 145, less than B2 6MHz, suggesting that with the 6MHz at a normal modulation depth the B2 6MHz error signal would be better than the 8 one.

Everything points towards the B2 6MHz as a promising error signal.

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