ATM Roger's mirror.

["James W. Burrows" <burrjaw@halcyon.com>]

At 11:39 1998-12-20 -0700, Roger Ceragioli wrote:

>Diameter of Mirror: 5.94"
>Radius of Curvature: 47.88"
>
>Edge Radii of Couder Mask:
>Zone 1 (inner radius): 0.00"
>       (outer radius): 0.79"
>Zone 2 (outer radius): 1.61"
>Zone 3               : 2.17"
>Zone 4               : 2.60"
>Zone 5                 : 2.97"
>The raw data from the final test were as follows:
>Zone 1:  -.072/-.075
>Zone 2:  -.063
>Zone 3:  -.046
>Zone 4:  -.027
>Zone 5:  -.007/-.006

After resolving my confusion over the minus signs (I think they're correct
as written (smaller means closer to the mirror), if tex will handle
negative numbers), sixtests gives wavefront P-V = 1/2.7, WRMS = 1/9.9,
Strehl = .666.  The surface deviation plot says oblate spheroid - mucho
undercorrection.

The disagreement between star test and these Foucault results can probably
be ascribed to the f/4 mirror.  Expert Major Krajci suggests using a pin
stick instead of a Couder mask for fast mirrors.  You might give that a
try, see if you get better agreement with star test.  Please report
results, the ATM community awaits.

        -- Jim Burrows          phone 206.244.2933, fax .0294
        --                      mailto:burrjaw@halcyon.com
        -- Seattle              N47.4722, W122.3661 (WGS84)