40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  ATF eLog  Not logged in ELOG logo
Entry  Thu Aug 5 11:53:26 2021, Radhika, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS model_fit_v_data.pdf
    Reply  Wed Aug 11 14:58:47 2021, Radhika, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS rad_model_fit_v_data.pdfrad_cond_model_fit_v_data.pdf
       Reply  Wed Aug 11 18:00:19 2021, Koji, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS 
          Reply  Fri Aug 13 15:14:14 2021, Radhika, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS rad_295_model_fit_v_data.pdf
             Reply  Fri Aug 13 21:01:42 2021, Radhika, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS 
                Reply  Thu Aug 19 14:34:10 2021, Radhika, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS model_fit_tm_painted.pdfmodels_painted.pdf
                   Reply  Fri Aug 20 13:44:58 2021, rana, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS 
                      Reply  Fri Aug 20 14:05:45 2021, Radhika, DailyProgress, Cryo vacuum chamber, Cooldown model fitting for MS 
Message ID: 2649     Entry time: Fri Aug 20 14:05:45 2021     In reply to: 2648
Author: Radhika 
Type: DailyProgress 
Category: Cryo vacuum chamber 
Subject: Cooldown model fitting for MS 

The fit parameters are 1. the emissivity of the test mass and 2. the emissivity of the inner shield. Turning on absolute_sigma=True, the covariance matrix is:

[[4.40872002e-07 1.98911860e-07]
 [1.98911860e-07 1.50052351e-07]].

Interpreting this, the standard deviation \sigma of the parameters is:

e_testmass (painted with Aquadag): 0.00066398.

e_innershield (rough Al): 0.00038737.

As discussed in today's meeting, these values much lower than expected. I'll look more into how scipy.curve_fit calculates these values, and will use the fitting script discussed to better quantify the error. 

ELOG V3.1.3-