https://www.researchgate.net/publicatio ... orage_Ring
novel compact nuclear fusion concept based on a 20 MeV tabletop electron storage ring (ESR), which electrostatically confines and accelerates deuterium and tritium ions to fusion-relevant energies.
....analytical calculations and simulations suggest that a confined ion population of 10^17 within a volume of 1.25 × 10^-5 m^3 can yield fusion power exceeding 2 MW