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Message ID: 17073     Entry time: Wed Aug 10 20:30:54 2022
Author: Tega 
Type: Summary 
Category: SUS 
Subject: Characterisation of suspension damping 

[Yuta, Tega]

We diagnosed the suspension damping of the IMC/BHD/recycling optics by kicking the various degree of freedom (dof) and then tuning the gain so that we get a residual Q of approx. 5 in the cases where this can be achieved.

MC1: Good
MC2: SIDE-YAW coupling, but OK
MC3: Too much coupling between dofs, NEEDS ATTENTION
LO1: Good
LO2: Good
AS1: POS-PIT coupling, close to oscillation, cnt2um off, NEEDS ATTENTION
AS4: PIT-YAW coupling, cannot increase YAW gain because of coupling, No cnt2um, No Cheby, NEEDS ATTENTION
PR2: No cnt2um, No Cheby
PR3: POS-PIT coupling, cannot increase POS/PIT/YAW gain because of coupling, No cnt2um, No Cheby, NEEDS ATTENTION
SR2: No cnt2um

Attachment 1: BHD_SUSPIT_KICK.png  172 kB  Uploaded Wed Aug 10 21:33:18 2022  | Hide | Hide all | Show all
BHD_SUSPIT_KICK.png
Attachment 2: BHD_SUSPOS_KICK.png  189 kB  Uploaded Wed Aug 10 21:33:18 2022  | Show | Hide all | Show all
Attachment 3: BHD_SUSSIDE_KICK.png  166 kB  Uploaded Wed Aug 10 21:33:18 2022  | Hide | Hide all | Show all
BHD_SUSSIDE_KICK.png
Attachment 4: BHD_SUSYAW_KICK.png  148 kB  Uploaded Wed Aug 10 21:33:18 2022  | Hide | Hide all | Show all
BHD_SUSYAW_KICK.png
Attachment 5: IMC_SUSPIT_KICK.png  158 kB  Uploaded Wed Aug 10 21:34:07 2022  | Hide | Hide all | Show all
IMC_SUSPIT_KICK.png
Attachment 6: IMC_SUSPOS_KICK.png  173 kB  Uploaded Wed Aug 10 21:34:07 2022  | Hide | Hide all | Show all
IMC_SUSPOS_KICK.png
Attachment 7: IMC_SUSSIDE_KICK.png  163 kB  Uploaded Wed Aug 10 21:34:07 2022  | Hide | Hide all | Show all
IMC_SUSSIDE_KICK.png
Attachment 8: IMC_SUSYAW_KICK.png  149 kB  Uploaded Wed Aug 10 21:34:07 2022  | Hide | Hide all | Show all
IMC_SUSYAW_KICK.png
Attachment 9: PRSR_SUSPIT_KICK.png  164 kB  Uploaded Wed Aug 10 21:34:17 2022  | Hide | Hide all | Show all
PRSR_SUSPIT_KICK.png
Attachment 10: PRSR_SUSPOS_KICK.png  153 kB  Uploaded Wed Aug 10 21:34:17 2022  | Hide | Hide all | Show all
PRSR_SUSPOS_KICK.png
Attachment 11: PRSR_SUSSIDE_KICK.png  130 kB  Uploaded Wed Aug 10 21:34:17 2022  | Hide | Hide all | Show all
PRSR_SUSSIDE_KICK.png
Attachment 12: PRSR_SUSYAW_KICK.png  160 kB  Uploaded Wed Aug 10 21:34:17 2022  | Hide | Hide all | Show all
PRSR_SUSYAW_KICK.png
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