Ubuntu Manpage: yao - Adaptive Optics simulation tool in yorick

NAME

       yao - Adaptive Optics simulation tool in yorick

SYNOPSIS

       Start yao with the gtk GUI:
          yao parfile.par
          yorick -i yaopy.i parfile.par

       Within yorick (no GUI, but same graphical output)
          #include yao.i
          aoread,"parfile.par"; aoinit; aoloop; go;

DESCRIPTION

Yao is a monte-carlo simulation package for adaptive optics. It includes fast core coded in C (e.g.
wavefront sensing) that are glued together by yorick interpreted code. One defines the system to evaluate
using a configuration file, and then run aoread, aoinit and aoloop. Yao features:

* Shack-Hartmann and Curvature WFS, on or off axis.

* Stackarray (piezostack), curvature (bimorph), modal (zernike) and Tip-Tilt deformable mirrors are
supported. The altitude of conjugation is adjustable.

* An arbitrary number of WFSs and DMs can be selected, with the possibility of mixing types. It is
therefore possible (and easy) to simulate single DM systems, as well as single non-zero conjugate,
GLAO and MCAO systems.

* It supports Natural and Laser Guide Stars (or a mix), WFS with photon and read-out noise.

* It uses a multi-layered atmospheric model, with geometrical propagation only.

* The loop execution has been optimized for speed: the critical routines have been coded in C. Yorick is
thus used as a convenient glue between lower levels optimized C calls. Overall, this is rather
efficient: A simple 6x6 Shack-Hartmann system runs at up to 650 iterations per second on an apple dual
2GHz G5 (200 iterations/sec for a full diffraction propagation model). A 50x50 Shack-Hartmann system
runs at about 3 iterations/s. A 188 curvature system runs at 25 iterations/s.

* Straightforward scriptability to probe parameter domains.

* GTK GUI to change some of the system parameters while the loop is running (new in v4.0). This provides
an educational approach to Adaptive Optics (newbies can play with the parameters and immediately sees
how the system reacts) and can also provides a quick way to investigate the stability conditions for a
newly designed system, before entering more serious Monte-carlo simulations.

Options
help,aoread will give you information about the syntax, parameters and keywords of aoread. See
help,aoinit and help,aoloop also.

AUTHOR

       Francois Rigaut, Gemini Observatory

FILES

       Input files:

       parfile.par    A yao parameter file. This file follows a regular yorick syntax. It is  directly  included
                      by  yorick  to  define the structures used by yao. As it might be a little bit daunting to
                      create a parfile from scratch, example parfiles are provided. Their  location  depends  on
                      the installation. Search for yao/examples (e.g. shx6x.par, curvature.par)

       screen*.fits   To  simulate  the  atmospheric  turbulence,  yao needs phase screens. You can create phase
                      screens with create_phase_screens(). They might also be included in your distribution.

       Output files:

       parfile.res    After a simulation run, results are output in parfile.res in the cwd

BUGS