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AdV-COM (AdV commissioning (1st part) )
bersanetti - 12:20 Monday 23 June 2025 (67100) Print this report
Unlocks from LOW_NOISE_3 from 18 to 22 June

I analyzed the unlocks in the last five days (excluding Commissioning activities):

  • 18/06/2025    09:19:47    DARM glitch at 750 Hz
  • 19/06/2025    04:01:11    PR or BS TX oscillation
  • 19/06/2025    07:43:50    NE glitch
  • 19/06/2025    17:47:42    NE glitch
  • 19/06/2025    21:37:35    DARM glitch at 1.2 kHz
  • 20/06/2025    00:19:13    Oscillation at 5.2 Hz
  • 20/06/2025    02:09:05    WE glitch
  • 20/06/2025    07:16:30    WE glitch
  • 20/06/2025    12:04:02    NE glitch
  • 20/06/2025    20:47:02    NE glitch
  • 21/06/2025    08:32:31    WE glitch
  • 21/06/2025    09:36:10    PR TX or NE MAR glitch
  • 21/06/2025    18:15:47    WE glitch
  • 21/06/2025    19:06:03    WE glitch
  • 21/06/2025    21:06:33    WE glitch
  • 22/06/2025    00:30:49    WE glitch
  • 22/06/2025    04:14:07    NE glitch
  • 22/06/2025    07:53:44    SSFS glitch
  • 22/06/2025    13:10:33    NE glitch
  • 22/06/2025    14:56:27    WE glitch
  • 22/06/2025    22:36:47    WE glitch

Statistics:

  • NE+WE glitch: 68 % (15/22 unlocks)
  • all others were single instances.
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Comments to this report:
mwas - 16:23 Monday 23 June 2025 (67105) Print this report

There are also cases where the interferometer can survive DSP glitches.

Figure 1 shows a case when the alignment of the OMC was kicked by the B1 PD saturation.

Figure 2 shows that before the B1 PD saturation the NE correction signal received by the DSP was slightly different from the one sent by the LSC process.

Figure 3 shows the difference between the sent and recevied NE signal in a more clear way, by shifting by 4 samples the received correction so it is close to be superposed with the sent one, there are two red dots which are clearly not following the blue ones.

This case also happened after the transceiver replacement of this morning.

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