dual beams
https://mediaspace.wisc.edu/media/Introduction+to+Focused+Ion+Beam/1_84r…
https://app.jove.com/v/10482/focused-ion-beams
https://www.thermofisher.com/us/en/home/global/forms/industrial/helios-5…
https://www.tescan.com/webinars/
https://www.tescan.com/product/tescan-amber-x-ls/