OK – No high pulse rates.
So enlarge the “Onion” slightly and have 3 focus devices clustered together inside aimed at a single drift tube and fire serially.
Individual pulse rate 330 Hz.
Combined pulse rate – 990 Hz.
Combined output – 15 MW.
Drift tube made of unobtainium and pixie dust.
Promote using Squirrel Marketing (borrowed term) small, agile and nuts. 😛