If you're looking for how to run SUSI, try here. If you're looking for assorted SUSI documentation from CVS, try here. If you want to set up CVS for yourself using e.g. cshrc, first add the following lines to your .cshrc file and open a new shell:

setenv CVSROOT username@arthur.physics.usyd.edu.au:/usr/local/susi/cvsroot
setenv CVS_RSH ssh
... replacing "username" with your username, then (assuming "cvs" is installed on your machine):
cvs checkout doc
To install cvs on a mac, you can use fink (or maybe MacPorts).

If you are really keen and want to help with some fun SUSI upgrades, try here .

We are attempting to put this documentation in a html format . Any ideas?


PAVO@SUSI began seriously when Mike Ireland started at the University of Sydney in April 2007, after basic experience with the concept was gained at CHARA. We are hopeful that the system will be working and basically functional by mid-July, 2008. There are several different tasks:
  • Create a PAVO back-end, with lenslet array, prism and detector.
  • Route the tip/tilt beams into this back-end.
  • Create new injection optics (field lens and 40m focal-length lenses).
  • Create PAVO group delay tracker optics
  • Re-install the SUSI red-table hardware in re-arranged optical setup.
The order of these tasks, or what "basically functional" means is still to be determined.

Optical Concept - "Front-End"

The first concept for the SUSI optics, to go on the central pier, is given below (xfig file susi_cp2.fig). The blue lines are ~420-520 nm, the green lines are ~520-800 nm, and the red lines are ~800-950 nm. Up is East, with the beams coming from the LDC units. The beams are converging at f/1000, being focussed from the ends of the delay line tunnel. The blue lines come to focus at the lenslet array, and the green lines come to focus at the knife edge. Just to the right of the knife-edge is the image-plane mask. This image-plane has a scale of 0.58 mm per arcsec, which means that the holes in the mask are approximately 1 mm across. The diagram is not quite to scale, and should be elongated by a factor of ~4 in the vertical direction, with the PAVO back end placed on the edge of the current red table. The ~2m between the knife-edge and the lenslet array gives a pupil scale of 2mm, based on a 120mm input pupil. This setup is constructed with dicroics from Semrock: the short-pass dichroic is the FF01-439/154-25, and the long-pass dichroic is the BLP01-785R-25. The choice of these two filters means that the "green" beams, i.e. the PAVO fringe-tracking beams, would have to handle 515 to 805 nm (at ~20% throughput), with 525 to 800 nm being the > 90% throughput range. With the existing 950nm blocking filters, we get a fringe-scanning bandpass of ~800 to 950nm, an ~18% bandpass.


Optical Concept - "Back-End"

The "Back-End" optics consist of a lenslet array, achromatic lens, prism, achromatic lens and detector. For simplicity, we will only consider 1:1 designs for the two achromatic lenses. The lenslet array was to be a 0.5mm pitch f/5 microlens array from SUSS micro-optics. This no-longer exists as a catalog item, although there is a 25mm circular version for nearly 3 times the cost. Assuming a 50mm achromat lens (i.e. the lenses from CHARA), then a 45 degree prism is best to get a ~40 micron coherence length per channel for the back-end.