If you want a gas discharge tube and not vacuum, you can even drop the coil on the inside: https://hackaday.io/project/194683-plasma-toroid-sky-guided-...
But most hollow-state devices run on either DC or pulses, so coupled inductors wouldn't work.
If you want a gas discharge tube and not vacuum, you can even drop the coil on the inside: https://hackaday.io/project/194683-plasma-toroid-sky-guided-...
But most hollow-state devices run on either DC or pulses, so coupled inductors wouldn't work.
Wouldn't work ... without additional electronic components.
Than you can skip the hollow state part altogether. And any plastic-package parts would screw your vacuum up badly - if it survives sealing and bakeout that is.