I know of a few. They use a lot when installed, but rarely need top-ups. They ar...

		lostlogin 30 days ago \| parent \| context \| favorite \| on: Helium is hard to replace I know of a few. They use a lot when installed, but rarely need top-ups. They are shipped full of helium and chilled, but aren’t ramped up (so aren’t superconducting magnets until after commissioning).