Issues to be Determined or
Resolved:
On the ATCS Control Model (Prototype), the beam linear diameter on the APD
head is Bld=400um for a plate scale of ps=318um, thus it represents an
angular diameter Bad=1.258".
The M6 mirror can move 1mrad (= 3'26.26") apart its center
position, equivalent to -10;+10V input on the PI Controller (=.
The ratio of M1 to M6 pupil is G = 1.8 / 0.03 = 60.
It yields M6 max. angular tilt corresponds to T = 2 * 1mrad / 60 = +- 6.88" in
each direction.
Let h be the distance M6 to APD, and t the tilt angle applied to M6,
The Interaction Matrix IM0 is [(A 0)(0 B)]
Linearity domain: up to a=0.25 for the centroid values, (the
centroid value of 1 is obtained at half the beam diameter = 200um)
The mirror coefficient shall be retrived from the TF of the mirror
(using MathLab): Last modified: Mon Feb 14 10:36:00 MET 2000
on the APD, 1" sky = 318um = h * 2t
=> t = 318E-6/2h = 32.8" / h
On the ATCS CM, h=1.10 m => t=29.8"
thus the scale
but: 2^15 / (3'26.26" / t) = 4740
where A=B= 1/2 * Bad = 0.629"
ie. Bld/2/a = 50um in the APD plane = 50/ps = 0.16" sky (TBD)