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AdV-COM (AdV commissioning (1st part) )
mwas - 11:33 Tuesday 26 June 2018 (41991) Print this report
Comment to ITF Recovery: back in LOW_NOISE_3, max BNS Range > 35 Mpc (41986)
The demodulation noise has improved significantly.
Figure 1 shows the projection which is now more than a factor 10 below the noise curve at most frequency, and with lines reaching the noise floor.
This is likely due to the swap of the GPS receiver.

Figure 2 and 3 show the improvement in the demodulation phase spectra. The SPRB 10MHz clock and the B4 112MHz phase spectrum is a factor 10 lower. Note, the atomic clock comparison is not useful as there was some 2*pi wrapping jumps in the reference time. This also explains the disappearance of several bumps in the PRCL spectrum between 50Hz and 150Hz, that where caused by the SSFS loop error signal being spoiled by the demodulation phase.
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