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Entry  Thu Aug 6 00:34:38 2020, Yehonathan, Update, BHD, Monte Carlo Simulations 8x
    Reply  Fri Aug 7 11:23:47 2020, rana, Update, BHD, Monte Carlo Simulations 
       Reply  Mon Aug 10 07:13:00 2020, Yehonathan, Update, BHD, Monte Carlo Simulations 8x
          Reply  Tue Aug 25 05:51:29 2020, Yehonathan, Update, BHD, Monte Carlo Simulations 8x
             Reply  Mon Sep 14 07:50:01 2020, Yehonathan, Update, BHD, Monte Carlo Simulations 10x
                Reply  Fri Oct 16 09:16:37 2020, Yehonathan, Update, BHD, Monte Carlo Simulations 8x
                   Reply  Thu Oct 22 11:48:08 2020, Yehonathan, Update, BHD, Monte Carlo Simulations 8x
                      Reply  Thu Dec 10 14:48:00 2020, Yehonathan, Update, BHD, Monte Carlo Simulations MCMCLance_NoiseBudget_Example.pdfIFO_Check.pdf
                         Reply  Fri Dec 11 09:28:52 2020, rana, Update, BHD, Monte Carlo loop coupling Simulations 
                            Reply  Mon Dec 14 11:09:28 2020, Yehonathan, Update, BHD, Monte Carlo loop coupling Simulations MCMC_LANCE_OLTFs.pdfMCMC_LANCE_OLCoupling2DARM.pdf
                               Reply  Mon Jan 11 16:11:51 2021, Yehonathan, Update, BHD, Monte Carlo loop coupling Simulations MC_LANCE_OLTFs.pdf
                                  Reply  Mon Jan 11 19:10:10 2021, rana, Update, BHD, Monte Carlo loop coupling Simulations 
Message ID: 15758     Entry time: Mon Jan 11 16:11:51 2021     In reply to: 15734     Reply to this: 15759
Author: Yehonathan 
Type: Update 
Category: BHD 
Subject: Monte Carlo loop coupling Simulations 

I dived into the alog to make the OLTFs in the MC_controls example more realistic. I was mainly inspired by these entries:

https://alog.ligo-la.caltech.edu/aLOG/uploads/47116_20190708131007_carmolg_20190702.png

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=18742

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=20466

and Evan's and Dennis's Theses.

Attachment 1 shows the new OLTFs. I tried to make them go like 1/f around the UGF and fall as quickly as possible at higher frequencies. I didn't do more advanced stability checks.

I also noticed that imbalances and detunings in the MC simulation can change the plants significantly. Especially DARM, CARM, and sometimes PRCL. I added the option to fix some OLTFs throughout the simulation. At every iteration, the simulation computes the required control filter to fix the selected OLTFs such that it will match the OLTFs in the undetuned and balanced IFO.

 

 

 

Attachment 1: MC_LANCE_OLTFs.pdf  28 kB  | Hide | Hide all
MC_LANCE_OLTFs.pdf
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