cosmos
Step 1
Have a functional ion beam emitter

Step 2
Place a ion prism in front

Step 3
Place more ion prisms

Step 4
Select the first ion prism, then
4a) Left-click its Link to Ion Prism button

4b) Left-click another ion prism to link the two

Step 5
Link more prisms
Step 6
Test run: Change fire mode of any prism to Auto-Fire and...

..watch the fireworks.