We set up the geophone for the vibration check at OMC chamber.
Geophone part setting and feed through setting will be reported by RTakahashi-san.
1. Set the seismometer near the OMC chamber.
2. Temporally placed the geophone distributor circuit to 18 of the OMC2 rack
3. Using PEM Yobi D-sub cable, we connected from geophone distributor to IY0 rack
- Channel name is K1:PEM-PORTABLE_IYC_RACK_IY0_ADC1_DSUB5
4. Set the geophone on the floor of OMC chamber
5. Measured the spectrum and evaluated the calibration factor of geophone by comparing with seismometer(Y arm direction)
- temporal calibration factor was evaluated by eye to overlap the spectrum around 10-20Hz between geophone and seismometer(Fig.1.)
6. Set the geophone to OMC chamber
- Current spectrum is shown in Fig.2.
We installed the geophone pod into the OMC chamber.
- Attached the feedthrough flange (D-sub 9pin x8) onto the OMC chamber.
- Put the geophone pod (#35-179) on the floor by the chamber.
- Connected the in-vacuum cables from the feedthrough to the pod.
- Connected the outer cables from the feedthrough to the geophone distributer.
- Compared the geophone spectrum with the seismometer one.
- Moved the pod from the floor to the chamber. The pod was put on the breadboard (-X side) in the chamber.
Specification of geophone (#35): F0=1.02Hz, Q=1.9
[Takahashi, Sato]
The feedthrough flange (Dsub 9pin x8) for the geophone, which was used to measure the vibration on the breadboard in the OMC chamber, was replaced with the blank flange.