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MIR (SR2)
hiromi.yasui - 16:57 Wednesday 23 March 2022 (20205) Print this report
Mirror Cleaning

with Hirata-san, Fabian-san

The preparation of this cleaning was reported on klog 20185.

We applied the First Contact on the HR side of the SR2 mirror, and this was my first First Contact.

 

At first, we carefully applied the first layer and overcoated 5 more layers.

After that, we put two peeling tabs on the left and right sides respectively and additionally overcoated 2 more layers.

(We got one drop on the lower left of jig and we hope it doesn't reach to the mirror...)

It took about 3hours.

Some pictures of this work are uploaded here.

 

We are planning to peel off this FC tomorrow afternoon.

 

Images attached to this report
Comments to this report:
hiromi.yasui - 16:44 Thursday 24 March 2022 (20221) Print this report

with Hirata-san, Fabian-san

We removed the jig at first and then peeled off this FC by pulling the left tab with blowing the Top gun.

Unfortunately, there is FC residue and one spot of dirt on its left side.

We could find these two pieces of dirt by visual inspection, but we found some more dirt by camera shot.

Please check the attached picture and discuss the next step.

Non-image files attached to this comment
hiromi.yasui - 17:37 Friday 25 March 2022 (20232) Print this report

This morning, we inspected the surface of the mirror with Tomaru-san using Flashlight, Blacklight, and Greenlight.

The Greenlight helped us a lot to find some particles on its surface.

And he suggested that the FC residue and some small stains won't affect much because these are not close to its center.

On the other hand, we realized that the AR side has some stains, which were never found before, on its upper right area and lower right area.

You can see that in our pictures (https://www.dropbox.com/work/Subsystems/MIR/mirror%20inspection/SR2/20220325).

 

After some discussion, we started to apply the First Contact on the AR side, and no need for HR.

The method is the same as yesterday, and I carefully put two peeling tabs so that these tabs could reach the edge of the FC.

We took some pictures and uploaded on here.

And we will peel off this FC on Monday morning and inspect it again.

Images attached to this comment
hiromi.yasui - 17:50 Monday 28 March 2022 (20260) Print this report

with Hirata-san, Tomaru-san

We removed the jig for AR and peeled off this FC by blowing the Top gun.

Unfortunately, FC residue remains on its right side, which we pulled the peeling tab, and some stains we want to remove also remain.

Some pictures of the surface of this mirror were stored here.

Then we realized that this type of stain couldn't be clean by the First Contact.

Furthermore, the mirror has still some small dust and we couldn't remove them by blowing the top gun.

But this dust could have stuck to its surface after the FC was removed because we were working upwind.

Anyway, we decided we couldn't do any more cleaning and we released the suspension.

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