Simon, Pengbo

Today we covered both side of the sample OSTM (Sigma koki) with the first contact, and then put it on the sample holder.

After that, we started the polarization measurement of the KAGRA #7 sample. First,  we found an arrow on the barrel and some dirty marks on one side, so we used optical tissues with alcohol to clean it. Then, we put the sample on the holder with the arrow at the top, and start the p-polarization map.