I removed again the translation stage and placed the tama-size mirror mount, tightly fixed to the optical board.

Yesterday I took 1h of data (rate 100ms) with the pump OFF and  1h of data with the pump ON (9W).

Today I repeated the same measurement: 1h at 0W and 1h at 9W.

I plot the raw data. Blue is the 0W data and red is the 9W data.

I will filter and calculate the ppm/cm.