I plotted the temperature difference between two cavities vs VCOMON.
This might give us how temperature on the vacuum can couples to frequency drift (at least for diurnal change.)
More data is needed to verify this.
Since VCOMON channel was added yesterday, I can plotted the data upto 20hrs.
Fig1 shows time series data of 1) temperature difference between ACAV and RCAV , 2)VCOMON.
the temperature is multiplied by a factor of 100 for easy comparison.
Fig2 is a plot of dT vs VCOMON. The data before t = 500 min are discarded (no VCOMON data yet).
More data is needed for a better linear fit.
Electronic jumps in RCAV temp results in the jumps in dT as well. We can see jumps at t ~300, 700, 800 in fig1.
We'll figure out how to fix this jump.