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AdV-DAQ (Data Acquisition and Global Control)
casanueva, masserot, was - 14:35 Tuesday 09 September 2025 (67663) Print this report
B1p_PD1 56MHz acquired at 40KHz

This morning we set up the demodulation of the B1p_PD1_56MHz at 40KHz, see the time sequence .

  • the B1p_PD1_56MHz signals built by the demodulation mezzanine are now acquired at 40KHz instead of 10KHz previously
    • After the demodulation mezzanine reconfiguration, the phase of the 100MHz Timing clock  acquired by the same demodulation board remained at the same value
  • At the SDB2_Photodiode server , there is now 2 parts related to the B1p_PD1_56MHz demodulation
    • the standard one for the 10KHz processing
      • The input channels now acquired at 40KHz are filtered and  decimated at 10KHz with a dedicated filter called "flt_40KHzTo10KHz" to have the same delay as previously.
    • and the other for the 40KHz one
      • the LNFS_56MHz phase available at 10KHz has been extended to 40KHz using its sinus and cosine .
      • the B1p_PD1 56MHz demodulation at 40KHz has been setup , with the facilties to perform the demodulation noises mitigation if needed . These mitigations are by default disabled
      • The DAQ channels available are:
        • the demodulation outputs:  SDB2_B1p_PD1_56MHz_{I,Q}_40KHz  and SDB2_B1p_PD1_56MHz_{mag,phi}_FS
        • the demodulation phases:  SDB2_B1p_56MHz_phi0_40KHz,  SDB2_B1p_PD1_56MHz_phi0_40KHz
        • and the demodulation amplitude and phase noise corrections:  SDB2_B1p_PD1_56MHz_6MHz_ampl_noise_corr_40KHz_FS  and SDB2_B1p_PD1_56MHz_phase_noise_corr_40KHz_FS
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Comments to this report:
masserot - 20:17 Tuesday 09 September 2025 (67668) Print this report

The B1p_56MHz_phi0_40KHz phase has been set to the same value as  B1p_56MHz_phi0  , meaning 4.3 .

The attached plot

  • compares the ASD fo the B1p_PD1_56MHz_{I,Q} signal at 10KHz and 40KHz
  • shows the coherence of the  B1p_PD1_56MHz_{I,Q}_40KHz with the demodulation phase noise (B1p_PD1_56Mhz_phase_noise_corr_40KHz_FS)
  • shows the coherence between the  B1p_PD1_56MHz_{I,Q} signal at 10KHz and 40KHz

According to these plots and the shape of the  B1p_PD1_56Mhz_phase_noise_corr_40KHz_FS, it seems that the demodulation phase noise mitigation can be activated without adding noise in the 10KHz-12KHz frequency band

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