Abe, Marc, Matteo
This morning, we installed the 1cm thick SHINKOSHA sample.
We recentered the beam dump on the laser unit and covered back this unit.
Then, we increased the power to ~300 mW to check the sample center and inclinaison.
We checked its X,Y and Z centers :
X center = 398.195 mm
Y center = 121.5 mm
Z center = 51.4 mm
Then, we checked the z center at the left, right, bottom and top position of the sample with extremal positions separated by 13 cm.
We found a 0.8 mm vertical tilt of the mirror and a 0.4 mm horizontal tilt.
Finally, we increased the laser power to 3.46W and started the measurement of absorption map of this sample.
We also did a preliminary evaluation of the absorption as
AC = 3.6e-3 V;
DC = 4.71 V;
P_in = 3.46 W;
P_t = 2.94 W;
T_sample = P_t/P_in;
R_bulk =0.7414 W/cm;
mat_correction=3.34;
abs = AC/(DC*P_in*sqrt(T_sample)*R_bulk)*1e6*mat_correction ~1080 ppm/cm
Before the measurement we also moved the IU to z=68.6mm.
I'll add to the wiki the IU position for surface and bulk reference as well as TAMA size, 1cm shinkosha and KAGRA samples.