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VIS (OMM)
ryutaro.takahashi - 22:01 Tuesday 18 June 2024 (29973) Print this report
Installation of OMC stack

[Aso, Washimi, Ito, Takahashi]

We installed the reconstructed stack and optical bench into the OMC chamber.

Stack Legs

  1. Cleaned the baseplate and chamber bottom using a vacuum cleaner and wipers.
  2. Set the guide rod at the center of the stack leg position.
  3. Attached three connection jigs to the SUS blocks of the #2 stack leg.
  4. Hung the combined stack leg up with the crane.
  5. Moved the stack leg into the chamber. The bottom bellows were set to the counterbores on the baseplate. Since #2 and #3 legs were offset from the crane line by 43cm, we needed to push horizontally by our hand with 13kgf.
  6. Repeated the installation of the other two legs.

 

Optical Bench

  1. Attached the disk balance suspended from the crane to the optical bench.
  2. Hung the optical bench a little. The bench was almost balanced.
  3. Hung the optical bench up so that the bench could clear the chamber wall.
  4. Moved the bench onto the stack legs. M10 bolts were inserted into the center of the stack leg.
  5. Covered the chamber with a clean bag.
Images attached to this report
Comments to this report:
ryutaro.takahashi - 22:51 Wednesday 19 June 2024 (29997) Print this report

[Aso, Washimi, Ito, Takahashi]

We adjusted the optics on the optical bench in the OMC chamber.

  1. Adjusted the height of the optical bench. Since the stack top was higher than the prediction, the support bolts in the optical bench to link the stack legs were drawn up so that the bench bottom could touch the stack leg directly. Then the support bolts were projected from the bench top. We gave up to use the bolt under the OMMT1 suspension. Finally, the measured height of the optical bench with the laser leveler was consistent with the last measurement.
  2. Closed the chamber with the bell jar. The O-ring was replaced.
  3. Installed the OMMT1 suspension. Three people pushed up the suspension from the outside of the chamber and one person pulled up it from inside the chamber. Since one of the markers for the positioning of the suspension was loose, we compared the position with the photo taken before the removal.
  4. Moved the OSTM suspension near the side hatch to adjust the OSEMs. The TM, IM, IRM, and bellows springs were released. Both the in-vacuum cables and the outer cables were connected.
  5. Released the TM, IM, IRM, and bellows springs. The black panel at Y- was removed to adjust the OSEMs.
  6. Installed the magnet dampers for the OMC suspension.
Images attached to this comment
tatsuki.washimi - 9:13 Thursday 20 June 2024 (30005) Print this report

{Additional photos}

We checked the tilt after "1. Adjusted the height of the optical bench". 
By our eyes, it looked fine.

Images attached to this comment
tomotada.akutsu - 10:08 Thursday 20 June 2024 (30007) Print this report

Oh, according to the 2nd photo, the pedestal of the steering mirror was about touching or overlapping the thick screw...

tatsuki.washimi - 10:49 Thursday 20 June 2024 (30009) Print this report

I confirmed it's eye's magic.

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tatsuki.washimi - 11:35 Thursday 20 June 2024 (30011) Print this report

We checked the height of the OMC optical table again this morning.

It looked fine.

Images attached to this comment
tatsuki.washimi - 17:08 Thursday 20 June 2024 (30018) Print this report

The gap is enough larger than the screw head tickness.

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ryutaro.takahashi - 20:24 Thursday 20 June 2024 (30030) Print this report

[Aso, Washimi, Takahashi]

We finalized the OMMT1 and OSTM suspensions.

  1. Attached the temporally removed black panel at Y- in the OMMT1 suspension.
  2. Adjusted the OSEMs in the OSTM suspension. It was difficult to adjust the horizontal position. The measured TFs became normal after the adjustment.
  3. Attached the black panels at X+ and Y+ in the OSTM suspension. The suspension was set to the original position on the optical bench.
Images attached to this comment
tomotada.akutsu - 20:36 Thursday 20 June 2024 (30031) Print this report

I have not heard that you will attach the shield plates back. Did you attach them without spring washers? Because of some dust issue, the spring washers should not be re-used even though they were originally used. Anyway, just inform to me before doing what are out of your business. You can use slack, right?

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