On Sept 20 PM, 2018
Uraguchi, K. Nagano, K. Tanaka, N Fujii, Akutsu
Pressing down the stage
We though it would be safer to make the suspended stage static before start any works. Fortunately VIS brought some heavy metal disks from Mitaka, which had been used to press the stage down as well in Mitaka. So we borrowed the disks and bring them to Xend and stacked on the stage (Fig 1 and 2). Then the stage somehow became static...
To avoid that we could not insert our fingers under each of the disks, we put three cut sunokos (soft floors) every time when we stack each disk. For some reasons, those disks were not sufficient to totally press down the stage, so we stole a top plate of the unused non-suspended stage for the BRT.
Detaching all the horizontal actuator coils
As shown in the pics, the yokes were digging into the actuator coil wires (Fig 3 and 4). Then we detached all (three) the actuator coils for horizontal actuation (Fig 5). The serial numbers are #7, 8, and 9.
The zoom of the damage is shown in Fig 6. Not only the coil wires but also the PEEK part which is the back of the wire winding, was also slightly damaged (scratched) by the yokes (Fig 7); it is natural...
The resolusion...
- We determined we will replace those damaged coils with those for the 2nd TMS-VIS so far.
- The same tragedy will also happen when we will crane the TMS-VIS up and lift it down into the EXT chamber. There are restraint parts to keep the relative postions of the actuator coils and yokes, so we will attach them when we crane it up.
