(Work on 13th)
[Hirata, Washimi, Takahashi]
This is a rapid report. Details will be reported later. We started assembling the new mirror. We found that the new mirror (85%) is thinner than the old mirror (70%). Measured thickness with vernier calipers was 7.9mm for the new mirror and 9.6mm for the old mirror at the edge marker. The thickness of the shims (#9 in Picture) was 1.5mm. Therefore, the flange (#5 in Picture) couldn't fix the mirror even if the shims were not used.
(Work on 13th, detail report)
[Takahashi.R, Hirata]
We assembled new 2inch mirror for SRM(pic1), and we reallized the new mirror was thinner than previous one, so we couldn't secure it properly.
At the end, we re-assembled SRM-M mirror again.
0. Preparation
We set two desktop COACH filters on the working desk.
1. First contact(FC): new SRM mirror
・I put FC on AR and HR side of new SRM mirror.
・First, FC was pour into the stainless bottle.
・5min later, pour FC to the center of mirror. I used brush to enlarge the FC area.(The tip of brush can touch FC only.)
・Few minutes later, I put tag on the surface of FC. The direction of the tag should not cover the triangle mark on the side of mirror.
・15min later, I changed surface and put FC again.
2. Disassemble SRM-M
I disassembled SRM-M mirror assy. It stored inside the decicator at the OMC area.
The shim plates for the six M3 screw were kept separate so they wouldn’t get mixed up.
3. Assemble New SRM mirror
・Align triangle mark which is on the side of mirror with scruch line of the black parts(parts#2).
・Assembled parts#7 and tightened M4 screws with 1.5Nm.
・Put O-ring on the mirror surface.
・Assembled parts#5, #9(shim plates). And realized the gap between parts#5 and parts#7 seems almost zero.
・Took some photos to chech thickness.
pic2: side view of new SRM mirror
pic3: side view of SRM-M mirror (old mirror)
pic4: new SRM mirror Assy without shim plates
pic5: SRM-M mirror Assy without shim plates (old mirror)
・Takahashi-san measured thickness of both mirrors by vernier caliper gage. It was reported on klog36579.
・Takahashi-san talked with Ushiba-san, and we decided to re-assemble SRM-M again.
4. First contact: SRM-M mirror
・I put FC to the SRM-M mirror: AR and HR side. Procedure was same as "1. FC:new SRM mirror".
5. Assemble SRM-M mirror
・Procedure is the same as "3. Assemble new SRM mirror" up to a certain stage.
・Assemble parts#5 and parts#9(Shim-plates), tighten M3 screws with 0.6 Nm.
[Takahashi, Washimi, Hirata]
We replaced the window mirror (SRM-W) with the 70% mirror (SRM-M). This is a demonstration for training in replacement. At the beginning, we confirmed the mirror's wedge direction: the X- side (Picture 1). We removed the black cylinder from the rear side and removed the mirror holder (Picture 2) by pushing with a Teflon bar from the rear side (Picture 3). We attached the assembled 70% mirror to the test mass (Picture 4), confirming the wedge direction (Picture 5).
We checked the extracted window mirror. The mirror thickness was 9.6mm at the wedge marker. Two 0.5mm shims were used as the spacer for the flange.
