Today at sharp 8:30 am, perfectly fine running experiment went bad again. The North path became buggy again with strong low frequency oscillations in almost all of the loops except the temperature control of vacuum can. The temperature control of beatnote frequency felt a step change and hence went into oscillations of about 65 kHz.
Not sure what went wrong, but 8:30 am might be the clue here. But can't change/test anything until I can go to the lab.
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