40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Wed Feb 2 14:18:37 2011, tara, Notes, NoiseBudget, Temperature vs frequency shift temp-vco.pngvco_vs_T.png
    Reply  Wed Feb 2 17:59:24 2011, rana, Notes, NoiseBudget, Temperature vs frequency shift 
Message ID: 466     Entry time: Wed Feb 2 14:18:37 2011     Reply to this: 467
Author: tara 
Type: Notes 
Category: NoiseBudget 
Subject: Temperature vs frequency shift 

 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.

Attachment 1: temp-vco.png  15 kB  | Hide | Hide all
Attachment 2: vco_vs_T.png  16 kB  | Hide | Hide all
ELOG V3.1.3-