A huge breakthrough in nuclear fusion technology has been achieved since our previous blog on nuclear fusion.
On Dec. 5, 2022, a team of scientists at the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory (LLNL) has achieved “scientific energy breakeven.” For the first time on Earth, a nuclear fusion device has produced more energy from fusion than the energy needed to drive it. This is a huge milestone as it confirms a proof of concept for nuclear fusion power generation.
Our previous blog outlined the idea of nuclear fusion, the various types, and what it means for humanity. Here is a short summary of the principles of nuclear fusion:
A nuclear fusion reaction occurs when two or more light nuclei merge to form a single heavier nucleus. Deuterium and tritium (both hydrogen isotopes) are used most often. When two light nuclei fuse, they form a single nucleus with less mass than the combined mass of the two nuclei. This missing mass is released as energy, which can be harvested. Nuclear fusion holds huge energy-generating potential and may be used to replace large baseload power stations in the future.
There are two primary approaches: magnetic confinement fusion (MCF) and inertial confinement fusion (ICF). Magnetic confinement fusion uses magnetic fields to hold and sustain a ribbon of plasma (a dense, hot state of matter), where fusion can occur. Inertial confinement fusion relies on the ignition of spherical fuel pellets and compression forces to create a sphere of plasma where fusion occurs. The approach used at LNLL is ICF.
What Happened at LNLL?
An array of high-energy laser beams hit the inner wall of a metallic cylinder. Within the cylinder is a peppercorn-sized fuel sphere of deuterium and tritium (both hydrogen isotopes). Before contact, the laser beams were converted from infrared to ultraviolet radiation. The laser beams simultaneously hit the inner wall of the metallic cylinder and generated x-rays. The x-rays caused the fuel sphere to implode, which created enough heat and pressure to induce fusion reactions.
For decades, scientists at LNLL have been running similar experiments, but this was the first time a scientific energy breakeven (or net fusion energy) was achieved. This recent experiment used 2.05 megajoules (MJ) of laser energy to induce a fusion energy output of 3.15MJ.
How Far Away is Commercial Nuclear Fusion?
One step closer, but still a few decades away.
The development at LNLL is the first significant step toward energy breakeven with nuclear fusion. However, ICF technology is still several steps behind MCF technology in terms of scalability. LNLL’s laser technology still needs to be modernized, and the approach needs to be optimized in many other ways.
The US Department of Energy (DOE) does aim to fund and develop a pilot nuclear fusion power plant by the 2040s. Building the technology and scalable infrastructure to support fusion energy production takes time and money. There will need to be a significant collaboration between the private sector and public institutions to reach commercial nuclear fusion power plants. Until commercial fusion is up and running, renewables will continue to be instrumental in achieving energy independence.
Click here to read our previous blog which explains nuclear fusion in more depth.
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