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  Fri Jun 1 16:30:09 2018, shruti, Summary, TempCtrl, Measuring thermal decay time constant VacCanTemp_analysis.pdfSetup_covered_in_aluminium.png
    Reply  Fri Jun 1 22:00:52 2018, Craig, Summary, TempCtrl, Measuring thermal decay time constant 
    Reply  Wed Jun 6 22:08:33 2018, rana, Summary, TempCtrl, Measuring thermal decay time constant 
Message ID: 2198     Entry time: Wed Jun 6 22:08:33 2018     In reply to: 2194
Author: rana 
Type: Summary 
Category: TempCtrl 
Subject: Measuring thermal decay time constant 

We expect the vacuum can to have multiple time constants since there are multiple sources of heat loss. Don't worry too much about fitting, just tune the model so that it matches the observation. i.e. the model should have more than 1 conductive cooling path. Once it is accurate to ~20-30%, better to focus on the feedback than the tuning of the model.

ELOG V3.1.3-