[Washimi, Takahashi]

We recovered the BF damper from the disconnection of H2 LVDT.

1. Opened the side hatch at the cross tube. Locked the BF body with the EQ stoppers.
2. Disconnected the Dsub connector for the secondary coils on the support ring. Checked the resistance of the coil side. The resistance between 2-7 pins (H2) was normal (11Ω).
3. Disconnected the Dsub connector for the primary coils on the side plate of the BF. Checked the resistance of the coil side. The resistance between 2-7 pins (H2) was overflow.
4. Dismounted the coil bobbin.
5. Found the socket came out from the cable to the feedthrough. Repaired the cable. Cramped the new socket to the top of the cable.
6. The lead cable from H2 coil was also cut at ~5cm from the pin side during the repair work. Repaired the cable. Cramped the new pin to the top of the lead cable.
7. Connected the coil to the Dsub side. Checked the resistance. It was 7.8Ω. Mounted the coil bobbin.
8. Connected the Dsub connector. Checked the signal on the medm. The H2 and other LVDTs were working.
9. Released the BF body. Closed the side hatch.

(Log on 14th)

[Ikeda, Washimi, Takahashi]

We applied new cabling to the primary coils for the BF damper. The lead wires were re-cabled on the side of the coil bobbin with the PEEK tie-anchor or the PEEK plate. The screws to fix the V2 coil was loose. Maybe it was a mistake when we recovered the coil. Additionally, the lead wires of the coils were fixed on the coil bobbins with an adhesive (TRA-BOND 2116).

[Takahashi, Ikeda, Washimi]

We repaired the H2 LVDT for the BF damper. The pin-socket connection on the primary coil was loose because the Kapton insulation tube was too long. The tube was shortened and the pin-socket was reconnected fast.

The capton sleeved cables seemingly sit on the coil; shook will not move them?? The worst case would be that the sleeves just sliding off the coil, and being located in-between the primary and secondary coils. Will it not happen with this setup?

[Washimi, Takahashi]

We checked the resistance and inductance of the LVDT coils for the BF damper at the feedthrough flange with the flip cable.