QinetiQ's T7 is a technically distinct ring-cusp electron-bombardment gridded-ion design derived from the Kaufman-type T6. The QinetiQ design paper documents a larger diameter, changed magnetic-field and anode geometry, 5-7 kW target power, dual-mode operation, and a high-specific-impulse mode above 4,000 s; the record preserves development status without asserting current production or flight use.