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AdV-SGD (FDS commissioning)
vardaro - 18:51 Wednesday 23 November 2022 (57880) Print this report
Recovery of QNR after the break and new on OFF measurement

After the break I did the following actions to recover the system:

  1. realigned GR and IR toward the filter cavity
  2. Enabled SQB1 and SQB2 tracking loops
  3. Locked the filter cavity with Green
  4. Put the IR in resonance and I understood that the length of the cavity was changed too much and the frequency of the SC to be in resonance was 100.087 MHz instead 100.090 MHz. I was not able to engage again FMODERR loop
  5. To engage the FMODERR loop I changed manually the length of the cavity by 800 um changing the constant F0_setpoint from -803 to -1503 in the FCEM SBE (i did it online the value is not saved). After that the SC was resonant in the caity with the PLL frequency of 100.090 MHz and I could engage again FMODERR
  6. I engaged SQZ measurement and I realigned the HD detector

I left the FDS on OFF measurement with detuning of 350 Hz, IR setting time of 100 sec and IR AA off during the ON OFF. From Fig 1 and 2 we have the doubt that the detuning jumps of the last runs were due to the IR AA bed settings

Measurement started at 17:50 UTC

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vardaro - 1:06 Thursday 24 November 2022 (57882) Print this report

At 00:00 UTC I decreased the detuning from 350 Hz to 210 Hz and I realigned the system

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