I am somewhat surprised not to see a mention of the humble x-ray tube (diode), or the medical linacs. Modern medical linacs are incredible, essentially a large

I am somewhat surprised not to see a mention of the humble x-ray tube (diode), or the medical linacs. Modern medical linacs are incredible, essentially a large block of copper that where you apply a few kilovolts and hydrogen on one end and get megaelectronvolt protons out the other end--the rf drive tube, vacuum pump, and resonant acceleration cavity is all integrated into one unit. https://altairusa.com/role-of-the-linear-accelerator-linac-in-cancer-radiation-therapy/ https://altairusa.com/role-of-the-linear-accelerator-linac-i...