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Virgo Runs (O4b)
berni - 23:01 Saturday 13 April 2024 (63958) Print this report
Operator Report - Afternoon shift

ITF found in Science mode.

From 18:30 UTC to 18:40 UTC ITF in Calibration to perform the planned DAILY_CALIBRATION.

At 19:35 UTC the ITF unlocked;  in the attached plot you can see a spike in the Sc_PR signals. At the same time the process ISC_Fb reported the following message:

2024-04-13-19h35m31-UTC>ERROR..-[TfbSource::StoreData] producer Sc_PR: overflow at GPS 1397072149.999912000 (received 2230 / expected 2000) (14490 times)

 

The ITF relocked at the first attempt; Science mode 20:27 UTC.

 

SBE

With the ITF unlocked I recovered the SPRB vertical position with step motors.

 

SUSP 

At the beginning of the shift, I contacted Paolo and Valerio regarding the issue with Sa_MC_F0_COIL_H1; to recover the correction, it would have been necessary to exit Science mode and perhaps unlock the ITF. We decided to continue monitoring the signal; around 16:00 UTC, the correction peaked and reversed the trend, so it was decided to postpone the intervention until tomorrow.

 

Guard tours (time in UTC)

13:00 - 13:30

17:00 - 17:30

20:00 - 20:30

21:40 - 22:10

Images attached to this report
Comments to this report:
masserot - 14:19 Friday 26 April 2024 (64105) Print this report

Looking at the ISC_Fb logfile, one can find  these 2 messages:

  • 2024-04-26-02h22m33-UTC>WARNING-[TfbSubFrame::Fill] GPS: 1398133371.600000000 - Source Sc_PR: 22/2000 missing packet(s), 0 data break(s) (missing data are at the end of the vector)
    • It means that  that 22 Sc_PR Tolm packets over the 2000 expected for a frame at 5Hz are missing.
  • 2024-04-26-02h22m33-UTC>ERROR..-[TfbSource::StoreData] producer Sc_PR: overflow at GPS 1398133371.999912050 (received 2021 / expected 2000) (1323 times)
    • this one is linked to each channel and it is a tagged message meaning that only the content of the last one is displayed with in parentheses the number of messages produced
    • the Sc_PR Tolm packet contains the data of 63 channels: 1323/63 = 21 Tolm packets
    • it means that 21 Sc_PR Tolm packets have been added to the 2000 expected

According to these 2 messages, as the frame building is done at 5Hz, it seems that

  • at for the frame GPS 1398133371.600000000 + 0.2, 22 Sc_PR Tolm packets were missing
  • while for the frame GPS 1398133371.800000000 + 0.2, 21 Tolm packets have been added to the 2000 expected

This plot at its zoom show the LSC_PR_Z_CORR and  Sc_PR_MIZ_LSC_CORR for  the 2024-04-26-02h22m33 event where

  • the purple rectangle show the 22 missing Sc_PR Tolm packect starting at GPS1398133371.7978
  • the orange rectangle show   the time periode from GPS1398133371.8 to GPS1398133371.8364 where Sc_PR Tolm packets are correctly received but the channels content are at zero at for the Sc_PR_MIZ_LSC_CORR  one

Related the 2024-04-13-19h35m32 Sc_PR event

ISC_Fb logfile report

  • 2024-04-13-19h35m31-UTC>WARNING-[TfbSubFrame::Fill] GPS: 1397072149.600000000 - Source Sc_PR: 230/2000 missing packet(s), 0 data break(s) (missing data are at the end of the vector)
    • 230 Sc_PR Tolm packet missing for the 5Hz frame time stamped 1397072149.600000000
  • 2024-04-13-19h35m31-UTC>ERROR..-[TfbSource::StoreData] producer Sc_PR: overflow at GPS 1397072149.999912000 (received 2230 / expected 2000) (14490 times)
    • 230 Sc_PR Tolm packets have been added to the 2000 expected for the last frame GPS 1397072149.8 + 0.2

This plot  show the LSC_PR_Z_CORR, Sc_PR_MIZ_LSC_CORR  and others Sc_PR channel for  this event where

  • the purple rectangle show the 230 missing Sc_PR Tolm packect starting at GPS1397072149.7770
  • the orange rectangle show   the time periode from  GPS1397072149.8 to  GPS1397072149. 8355 where Sc_PR Tolm packets are correctly received but the Sc_PR  channels content are at zeros
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