check vibration isolation performance at low frequency

[YoshinoriFujii]

Todo

• get the (current) information of vibration isolation performance at low frequency region:

  • Using local sensors like oplevs

  • measure the TF, IPexc ones with the following configuration, and then get the vibration isolation performance by multiplying the IP-ground-responose:

  • [ ] IPdcdamp + IPsc + BFdamp + BFsc

    • [x] ETMX
    • [x] ITMX
    • [x] ETMY
    • [ ] ITMY

  • [ ] IPdcdamp + IPsc (+ BFsc)

    • [x] ETMX
    • [x] ITMX
    • [x] ETMY
    • [ ] ITMY

  • [ ] IPdcdamp (+ BFsc)

    • [x] ETMX
    • [x] ITMX
    • [x] ETMY
    • [ ] ITMY

[YoshinoriFujii]

> IPdcdamp + IPsc + BFdamp + BFsc, at ETMX

• see /users/VISsvn/TypeAtower/ETMX/Measurements/TF/Measurements/20191004/IP_Lexc_w_control_ALIGNED.xml

  

• magenta: IPdcdamp + IPsc + BFdamp + BFsc

• cyan: IPdcdamp + IPsc (+ BFsc)

• red: IPdcdamp (+ BFsc)

[YoshinoriFujii]

> IPdcdamp + IPsc + BFdamp + BFsc, at ITMX

• see /users/VISsvn/TypeAtower/ITMX/Measurements/20191004/ITMX_IP_L_exc_w_control_ALIGNED.xml

---

• magenta: IPdcdamp + IPsc + BFdamp + BFsc
• cyan: IPdcdamp + IPsc (+ BFsc)
• red: IPdcdamp (+ BFsc)

[YoshinoriFujii]

> IPdcdamp + IPsc + BFdamp + BFsc, at ETMY

• see `/users/VISsvn/TypeAtower/ETMY/Measurements/TF/Measurements/20191004/I

P_Lexc_w_control_ALIGNED.xml`

---

• magenta: IPdcdamp + IPsc + BFdamp + BFsc
• cyan: IPdcdamp + IPsc (+ BFsc)
• red: IPdcdamp (+ BFsc)

[YoshinoriFujii]

> IPdcdamp + IPsc + BFdamp + BFsc, at ITMY

• see /users/VISsvn/TypeAtower/ITMY/Measurements/TF/20191004/IP_Lexc_w_control_ALIGNED.xml