[dsg-hallb_rich] [EXTERNAL] Re: Equation used to calculate mirror radius of curvature after d0 tests

[Marco Mirazita]

Hi Tyler,
I believe that all these numbers come from the geometry of the support 
of the fiber, camera and stepper motors with respect to some reference 
that I don't remember.
You may refer to the drawings that should be in the clean room.
They should not be changed unless something is changed in the support.
The only unknown is the distance between this support and the one of the 
mirrors.
Marco


Il 2021-11-02 16:17 Tyler Lemon ha scritto:
> Hi Marco,
> 
>  I'm looking at the PlotD0.C code and see that the mirror radius of
> curvature is calculated using the equation below
> 
> Radius = (distance - zOffset_fiber - zOffset_mirror) + (zOffset_motor
> - Zmin)
> 
> Where distance is the distance between the CCD stand and mirror stand
> and Zmin is the z position of the fit d0.
> 
> What lengths do zOffset_fiber, zOffset_mirror, and zOffset_motor
> correspond to in the test station?
> 
> It is clear that they are offsets in z from certain items but what are
> they offsets to?
> 
> To maybe help, PlotD0.C has the values of them as:
> zOffset_fiber = 40.682 mm
> 
> zOffset_mirror = 58 mm
> 
> zOffset_motor = 75.985 mm
> 
> -Tyler
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