It works by trapping particles in a Penning trap composed of gold-plated cylindrical electrode stacks made from oxygen-free copper that is surrounded by a superconducting magnet bore operated at cryogenic temperatures.
What does that even MEAN, lol?
Copper is a chemical element, atomic number 29 on the periodic table.
Oxygen is also a chemical element, atomic number 8 on the periodic table.
i.e, e,g., therefore, & also: all copper is "oxygen-free." If the article got something so simple as THIS completely wrong, one can easily presume that the REST of the article is incorrect gibberish.
"oXyGEn-fREE cOppER", lmao