South Pole Telescope Design
8 December 2003

South Pole Telescope Design

 SPST298

No chopper, small dewar with Lyot stop.

All mirrors are fairly small.  The tertiary is almost flat, and may work as a chopper.

Crazy suggestion---what about chopping by translating dewar and quatinary in x direction?

Figure 1 - side view, all fields

Figure 2 - side view, field 1 only

Figure 3 - detail of Figure 1

Figure 4 - detail of Figure 2

Figure 5 - Detail of Figure 3

Figure 6 - full-field spot diagram.  This design is well-corrected over full 1 degree field of view.

Figure 7 - Same as Figure 1, except the Lyot stop is opened to unblock all rays.

Figure 8 - Spot diagram with Lyot stop opened.