Check actuator coupling ratio at IP stage for Yarm suspensions

[YoshinoriFujii]

Background

• After a work of checking the mechanical coupling, I started to wonder how the coupling of Yarm suspensions are. To check the status of Y-arm suspensions

Todo

• [ ] Check the status of mechanical actuator coupling of Y-arm suspensions.
  • [ ] ITMY
  • [ ] ETMY

[YoshinoriFujii]

btw, before starting this work, on 2019.9.30

• I found that the steep 240Hz line was observed in both the Y-arm suspensions, and I have just removed it by adding notch to the LVDTINF filter bank.
• see /users/VIS/TypeA/general/LogNotes/20190930/Yarm_suspension_notch240/

  Before

  

After

[YoshinoriFujii]

ITMY

• see /users/VISsvn/TypeAtower/ITMY/Measurements/TF/20190930
• This measurement was done with the seismometer sensor correction ON.

  IP_L_exc

  

ちなみに

• IPLexc to TML

IP_T_exc

IP_Y_exc

• [ ] TO BE MEASURED!

---

Then,

• The actuator coupling was mostly same as that of ETMX suspension, not like the ITMX's.

[YoshinoriFujii]

ETMY

• see /users/VISsvn/TypeAtower/ETMY/Measurements/TF/Measurements/20190930
• This measurement was done with the seismometer sensor correction ON.

  IP_L_exc

  

ちなみに

• IPLexc to TML

IP_T_exc

• [ ] TO BE MEASURED!

IP_Y_exc

---

Then,

• The actuator coupling of ETMY was also mostly same as that of ETMX suspension, not like the ITMX's.

[YoshinoriFujii]

For comp:

• see https://github.com/YoshinoriFujii/Weekly-task/issues/31 as well.

ITMY

ETMY