Scientists at the U.S. Department of Energy’s Princeton Plasma Physics Laboratory have developed an enhanced version of the Lawson criterion, a fundamental equation that defines conditions necessary for achieving fusion ignition. The new approach incorporates four additional factors influencing fusion performance, suggesting that altering the sequence of plasma heating and compression could significantly decrease the energy needed to reach self-sustaining fusion reactions.
The research team, led by physicists Luis Delgado-Aparicio, Masayuki Ono, and Jonathan Menard, compares their discovery to finding a more efficient mountain pass. Traditional fusion strategies attempt to increase plasma density first before supplying enormous amounts of heat to achieve ignition. The new calculations indicate that heating the plasma before increasing its density could accomplish the same outcome while requiring substantially less energy. The scientists identified a particularly important region called the Cordey saddle, which represents a relatively accessible point on the boundary between plasma requiring external heating and plasma capable of sustaining its own fusion reactions.
The researchers evaluated different routes using a measurement called Q, which compares the power produced by fusion reactions with the external heating power supplied. In idealized plasma, the Cordey saddle occurs at approximately Q = 5, though actual fusion systems are more complex due to contaminants and magnetic field effects. The findings could influence the design of tokamaks and stellarators, the two major types of magnetic fusion devices being investigated for future fusion power plants.
A significant advance of this research is its comprehensive approach, evaluating multiple physical processes together rather than separately as previous studies had done. According to Ono, including these effects in the design process could prevent expensive problems during construction and operation. The work addresses critical scientific and technological challenges that must be overcome before commercial fusion power becomes viable, potentially helping engineers design more practical systems and avoid costly mistakes. The research was published in Physical Review Letters.
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