Tamaki, Aoumi, Uchiyama
We started cleaning optical windows for optical levers in EXC.
- We removed all windows used for the optical levers from EXC. The number is 16.
- We inspected and cleaned 8 windows. All of them were used in -Y side.
What we noticed are
- It's not as dirty as IY.
- Windows used on the inner shield are clean.
- The chamber side of the surface of the windows is dirty not like Ix and Iy.
Uchiyama found line-like scratches or dirt on the surface of the windows (MN_out+X-Y) during the cleaning. I could not clean it with isopropanol and acetone. I may have put it on during the cleaning.
Following is a memo of inspections.
*MN_out+X-Y: both sides were dirty. The line-like scratches or dirt on the front side of the window. I cleaned the window except for the scratch.
*MN_in+X-Y: both sides were thin stains. Uchiyama found a very small point-like scratch in the center of the window before cleaning. I cleaned the window except for the scratch.
*MN_out-X-Y: both sides were dirty. I cleaned the window.
*MN_in-X-Y: both sides were clean. I cleaned the window.
*TM_out+X-Y: the front surface was dirty. the back surface was clean. I cleaned the window.
*TM_in+X-Y: both sides were clean. Uchiyama found only dust and it was cleaned by air blow. I cleaned the window.
*PF_out+X-Y: the front surface was dirty. the back surface was clean. I cleaned the window.
*PF_in+X-Y: both sides were clean. There was a point-like dirt on the front side of the window. The dirt was cleaned with isopropanol. I cleaned the window.
Tamaki, Nakagaki, mTakahashi, Uchiyama
We reinstalled 16 windows which were removed before.
https://klog.icrr.u-tokyo.ac.jp/osl/?r=28976
Before the installation, Uchiyama inspected the windows used on the +Y side in EXC.
I found scratches on the window for MN_in+X+Y and MN_out-X+Y.
*TM_out+X+Y: The front side was thin stains. I cleaned the window.
*TM_in+X+Y: both sides were clean. I cleaned the window.
*PF_out+X+Y: The front side was thin stains. I cleaned the window.
*PF_in+X+Y: both sides were clean. I cleaned the window.
*MN_out+X+Y: both sides were clean. There was a point-like dirt on the back side of the window. I cleaned the window.
*MN_in+X+Y: both sides were clean. There is a line-like scratch on the front side. There is a point-like scratch on the backside. I cleaned the window except for the scratches.
*MN_out-X+Y: both sides were clean. There are point-like scratches on both sides. I cleaned the window except for the scratches.
*MN_in-X+Y: both sides were clean. I cleaned the window.
4 windows were not used for optical levers. We removed them.
The positions of the windows are followings.
TM_out-X+Y, TM_out-X-Y, PF_out-X+Y, PF_out+X+Y.
Ushiba, Nakagaki, Uchiyama
Last Friday, we removed 4 windows that were not used for optical levers.
Today, we disassembled the 4 windows into window glasses and frames.
Now 4 window glasses are kept in the desiccator beside IMC.
Two frames (TM_out-X-Y, PF_out-X-Y) have been reinstalled in EXC. The rest of the two frames (TM_out-X+Y, PF_out-X+Y) have not been installed yet.
