The Death Star achieves nuclear fusion at its core by storing and transferring energy from its various systems such as ventilation, heat exchangers, and weapons to the central mass. The immense size and amount of transient energy cycling to the core sustains a constant fusion reaction, powering the Death Star without relying solely on fusion.

1. The Death Star Power Plant
How the Death Star achieves a fusion core

2. The Death Star does not run on nuclear
fusion
• The Death Star systems are designed to run on virtually all forms of
imaginable energy transfer and conversion equipment.
• The Death Star is a system of energy recovery systems that primarily
store energy by transferring it to the core, or center, of the station.
• At the center of the station is an energy mass that forms as a result of
various energy transfer equipment (ventilation, heat exchangers, laser
beams, particle beams, projectiles, etc.)
• Due to the immense size of the power station, and the amount of
energy stored within the systems as transient energy, at the core of
the central “air-mass” is a fusion reaction that is sustained by the
constant cycling of energy to this mass.