I make windscreens out of 0.003" thick titanium foil. Aluminum may have to be a lot thicker.
You want to give some thought into this. How tall is your pot? If you are just going to spiral the windscreen and stick it into the pot, then the pot inside better be tall enough, otherwise you are going to have to fold the windscreen.
Lots of people intentionally fold their windscreen accordion-fashion to strengthen it and help it stand upright, and it can be collapsed and stored inside the pot for transport.