Andres R. & Jeff B. 

   After replacing the metal EQ Stops with the silica tip in chamber EQ stops, we installed the glass mass in H1-SR2. The mass is now suspended on a new wire loop. The measured pitch and roll of the M1, M2, and M3 masses are almost zero, (as close to zero as we can measure with an optical level). 

Per the XYZ Local CS document for H1-SR2 (D0901128) the center of the optics, including the spacer (D1100180), should be at 220.9mm above the ISI table. The measured height of the center of the M3 optics in H1-SR2 is 221.28mm above the ISI. As it is hanging, the center of the optic is 0.38mm high, which is within the +- 1mm tolerance for the center of the mass. 

Tomorrow we will center the OSEMs and start running transfer functions. 

M3 measurement data: 
Measured height of top of M3 mass = 215.7mm
Measured height of bottom of M3 mass = 64.79mm     
Center of M3 mass -->(215.7 – 64.79)/ 2 = 75.46mm 
Height of center of mass --> 64.79 + 75.46 = 140.25mm
Adjustment for spacer --> 140.25 + 81.03 = 221.28mm 
Height of beam path with spacer = 220.9mm
Mass height to beam path differential --> 221.28 – 220.9 = 0.38mm