Measuring input beam height above HAM1 table

Jennie W, Camilla,

This morning Camilla and I went into HAM1 on the +Y side and measured the beam height of the beam from the PSL above the table. This is to aid in the design for the JAC periscope.

First we measured the beam height near the septum window to HAM2. We had to use a metre stick that had been wiped down as the beam height was slightly too high for the 12 inch class-B ruler from the tool pan. This ruler had to be bent at the top as it reaches the sloping part of the edge of the chamber roof. Camilla and I took several measurements in case the bottom of the ruler was not straight up from the table.

+X (HAM2 side)

My measurements of this height are here and here - loks about 315mm above the table.

Camilla's measurements are here and here with three zoom outs so the bolt hole we lined the ruler up with and the surrounding components can be seen. Hers suggets 313 -314mm above the table.

We were both measuring in the same spot along the beam.

-X (PSL side)

My measurement on the -Y side suggests 317 mm above the table. The two following pictures are where I had the ruler in front of the balance mass.

This is another measurement with the ruler behind the balance mass but its too hard to see the numbers, I think it is still about 320 mm high here.

There are Camilla's measurements on the same side. The first looks like 317mm above the table, 311mm above the table. The third image shows Camilla had the ruler behind the balance mass (so in a different place from my first -X measurement).