damping loop performance check - Githubissues

YoshinoriFujii / Weekly-task

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damping loop performance check #29

Open YoshinoriFujii opened 4 years ago

YoshinoriFujii commented 4 years ago

generally

check if all the resonant modes which disturbs the lock-acquisition are damped with 1/e-decay-time<1 min.
- For the modes < ~20Hz
- For the TM modes.
- For the recoil-chain modes, would it be better to set another requirement?

with simulation

[ ] tune the vertical models which suits the actual ones.
[ ] check if the currently implemented ones are enough to damp the main-chain modes

with measurement

[ ] Measure the decay time constants of the modes

YoshinoriFujii commented 4 years ago

Tip: plotting decay-time vs. resonant frequencies

use: getqt_damp(sysc0,sysc);

I modified the acript a bit so that the script draws the requirement of 1min. properly, as follows
- /kagra/Dropbox/Personal/Fujii/TypeA/simulation/utility/getqt_damp.m so far,
```
loglog(vecpole0(:,1)/2./pi,1./vecpole0(:,2),'bo',...
vecpolec(:,1)/2./pi,1./vecpolec(:,2),'r.',...
freq,1000/pi./freq,'--y',...
   freq,60,'--m',...
'MarkerSize',8)
```

Then now,

loglog(vecpole0(:,1)/2./pi,1./vecpole0(:,2),'bo',...
       vecpolec(:,1)/2./pi,1./vecpolec(:,2),'r.',...
       freq,1000/pi./freq,'--y',...
       freq,10/pi./freq,'--g',...
       'MarkerSize',8)
hold on
[col, len] = size(freq);
loglog([freq(1) freq(len)], [60. 60.], 'm--');
%       freq,60,'--m',...
hold off

Also changed the figure size: https://stackoverflow.com/questions/5183047/setting-graph-figure-size set(fig,'Color','white', 'Position', [0 0 800 700])