Image Details
Caption: Figure 6.
Fiber positioner robots are shown packed together on the focal plate. In addition to the fiber ferrule, each ϕ arm has a light-trap hole with a dark dye. The original concept for these light traps was to be able to selectively extinguish bright stars in the field; in practice, they have been most useful for identifying ϕ angles during hardware debugging. A projecting tab feature on each ferrule holder provides a simple but effective hard limit against clockwise overextension.
© 2022. The Author(s). Published by the American Astronomical Society.