Project

General

Profile

IQ-R2 » History » Version 1

Stephen Kent, 07/19/2012 02:59 PM

1 1 Stephen Kent
h1. IQ-R2
2 1 Stephen Kent
3 1 Stephen Kent
Optical prescription, fabrication errors, alignment errors, flexure, and CCD non-planarity contribute no more than ???? waves RMS (or ??? FHWM) to images taken at best-focus position [DECam TO-2 (see Table 2 for budget), TO-4] To be tested over full HA/Dec range of Survey.
4 1 Stephen Kent
5 1 Stephen Kent
The idea is to test as many line-item contributions to the PSF budget as possible.  In practice we can probably do the following:
6 1 Stephen Kent
* Focal plane height varies by <= 30 microns peak-peak.
7 1 Stephen Kent
* Primary mirror figure / Corrector design / static alignment / flexure contribute <= ??? waves RMS.
8 1 Stephen Kent
9 1 Stephen Kent
h2. Prerequisites
10 1 Stephen Kent
11 1 Stephen Kent
* Same as for IQ-R1
12 1 Stephen Kent
13 1 Stephen Kent
h3. Procedure
14 1 Stephen Kent
15 1 Stephen Kent
* Use the same science CCD images as for IQ-R1.
16 1 Stephen Kent
* Reanalyze images but incorporate higher-order Zernike terms in the fit.
17 1 Stephen Kent
* Subtract out field patterns in coma, astigmatism that could be attributed to misalignment or primary mirror astigmatism.  (Alternatively, extract all azimuthally-symmetric Zernike patterns)
18 1 Stephen Kent
* Compute wave-front error from all remaining Zernikes.
19 1 Stephen Kent
20 1 Stephen Kent
h3. Verify