Feb 2005. Used a micrometer. Measured flyswatter thickness to be 0.030" with about 1/4 mil variations over the surface in the vicinity of the (visible) spot where we had beam.

Measured several locations on the dummy target frame where we had the beam. Got 0.121" with about a 1/2 mil variation.

For the front (vacuum) entrance window we measured 2 of the spares:
6.7 mils avg at the center of one, and about 1 mil thicker 2-3 mm away from the center.
7.0 mils avg at the center of the other one, and about 0.5 mil thicker 2-3 mm away from the center.

For the nose, the window at the He/H2 boundary, which is supposed to be real thin since there is not supposed to ever be any differential pressure across it, and it's only 11mm in diameter, we measured 3 of the spares:
9.0 mils avg at the center of one, and pretty uniform (within a few tenths of a mil) out to a few mm from the center.
9.6 mils avg on another, again pretty uniform away from center like the one before.
8.7 mils on the third one, also uniform. This third one we also used a regular micrometer and got 9.2 mils. Note that all the other measurements were done with the Hall effect thickness gauge.

The 10 mil calibration standard was measured to be 10.2, that's an indication of the measurement uncertainty (~0.2 mils).

They all have a tiny nib at the exact center from machining that's a little bit thicker, little bit means something like 1/2 mil but it's such a tiny feature we can't really measure it reliably.

Dave Meekens and I measured the thickness of the
exit window for the current G0 cell using a Hall
effect thickness gauge:

at center  0.0107"
up 1mm     0.0112"
up 3mm     0.0111"
BR 1mm     0.0118"
BR 2mm     0.0109"
BL 1mm     0.0111"
BL 2mm     0.0110"
down 1mm   0.0109"
down 2mm   0.0112"

Reckeck calibration: zero fixture: 0.0000"
                     0.0100 standard 0.0105"

Mike Seely