Abstract: we did a test installation of an oplev's pillar to the tunnel.

Workers: Uchiyama and Akutsu

The test installation has been done around (1) PR3 chamber, (2) IFI chamber (for IMMT2 mirror), and (3) MCF chamber (for MCo mirror).

For all cases, the bolt holes on the floor are all dirty, and the M24x130 bolts are hard to fit to them without cleaning the bolt holes; even after the cleaning, it was so hard,

so ratchet socket wrenches are used to screw. Actually we didn't have M24 washers today, so the legs have not been fully fixed.

 (1) for PR3,

It is known that the pillar and the chamber's hinge will mechanically interfer, and the inconvenient fact was confirmed. We just slide the pillar a little from the planned location, and found a so-so place, but not know wether the optical table on the pillar can be installed or not. When the pillar stands, the top surface is almost horizontal without shims (shown by a whater leveler), and this means the floor surface here and the pillar's upper and lower surfaces are well manufactured.

(2) for IMMT2 mirror

Not much mechanical intereferences, but one concern is space between a barrelhead attached to a gate valve between MCF and IFI chambers. Still the bolts were hard. When the pillar stands, the top surface is almost horizontal without shims (shown by a whater leveler), and this means the floor surface here and the pillar's upper and lower surfaces are well manufactured. The height from the top surface to the beam line is measured to be 112.5 mm (the beam line height is just estimated from the chamber structure). Then the oplev beam height from the optical table on the pillar can be estimated 112.5 - 27 = 85.5 mm. The expected beam height was 85.85~85.9 mm, so it could be in the tolerant range.

(3) for MCo mirror

Not much mechanical intereferece, but one concern is space between a reducing flange and the pillar. Still the bolts were hard. Unfortunately, the floor surface for the pillar is not so good, and we need two pieces of shims to make the top surface horizontal. The height from the top surface to the beam line is measured to be 115 mm (the beam line height is just estimated from the chamber structure), which should be the same as the one arund IFI chamber, but now it is obvious to have 2.5 mm difference. This difference would be a little bit large if you take into consderaton about measurement errors. Then the oplev beam height from the optical table on the pillar can be estimated 115 - 27 = 88 mm. The expected beam height was 85.85~85.9 mm, so it could be a little bit larger than my expectation, but can be tuned.