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Breakthrough in Nuclear Fusion: Record-Breaking Magnetic Field Achieved
A landmark achievement in nuclear fusion research has been made by a team at the University of Wisconsin-Madison. This breakthrough involves setting a new record for the strongest steady magnetic field used to confine plasma, raising optimism that future demonstration reactors could potentially produce more power than they consume.
New High-Temperature Superconductors
The pivotal magnets, developed by an innovative startup in the fusion industry, were recently delivered to the UW-Madison experiment. Upon cooling these magnets to their operating temperatures and applying a high electrical current, the team achieved a 17-tesla magnetic field, which is significantly stronger than high-resolution MRI scanners used for brain imaging. Strong magnetic fields are crucial for the specific fusion power approach being pursued by multiple organizations, given that a doubling of magnetic field strength can markedly increase a reactor's power output.
WHAM's Significant Milestone
WHAM, active for several years, recorded its first plasma with these new magnets. As noted by Kieran Furlong, a key figure in Realta, this marks a substantial milestone for WHAM. Despite Realta having emerged from WHAM in 2022, there remains a close collaboration with UW-Madison scientists and the ongoing experiments. This record-breaking magnetic field achievement follows the earlier record set by MIT’s Alcator C reactor, highlighting the closely-knit nature of the fusion research community.
CFS and Realta Innovations
Both CFS and Realta are dedicated to advancing powerful magnetic fields for containing burning plasma, which facilitates the fusion of hydrogen nuclei and subsequent release of significant heat. CFS utilizes a tokamak design, which forms plasma into a doughnut-like shape. Conversely, Realta and WHAM focus on a magnetic mirror design. This design employs two strong magnets to create a field that holds plasma in a form resembling a Tootsie roll. The plasma is compressed at either end, allowing hydrogen ions to collide and fuse in the midsection, releasing heat in the process.
Future Prospects: Anvil and Hammer Reactors
WHAM will continue to serve as a testbed for the magnetic mirror reactor design. Once adequate data and understanding are acquired, Realta aims to construct a demonstration reactor named Anvil, projected for completion later in the decade. This reactor will be a larger iteration of WHAM and will provide critical data on reactor design, as well as a platform for testing various materials under reactor conditions. Following Anvil, Realta plans to develop Hammer, an advanced version with dual magnets on each end to enable longer reactors, ultimately aiming for higher power output.
