Travel restrictions imposed by the COVID-19 pandemic are transforming, with pluses and minuses, scientific conferences around the world. Take the Coordinated Working Group Meeting (CWGM), an international event cohosted by the U.S.
A challenge to creating fusion energy on Earth is trapping the charged gas known as plasma that fuels fusion reactions within a strong magnetic field and keeping the plasma as hot and dense as possible for as long as possible. Now, scientists at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) have gained new insight into a common type of hiccup known as the sawtooth instability that cools the hot plasma in the center and interferes with the fusion reactions. These findings could help bring fusion energy closer to reality.
One way that scientists seek to bring to Earth the fusion process that powers the sun and stars is trapping hot, charged plasma gas within a twisting magnetic coil device shaped like a breakfast cruller. But the device, called a stellarator, must be precisely engineered to prevent heat from escaping the plasma core where it stokes the fusion reactions. Now, researchers at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) have demonstrated that an advanced computer code could help design stellarators that confine the essential heat more effectively.
From fresh insight into the capture and control on Earth of fusion energy that drives the sun and stars, to the launch of pioneering new initiatives, groundbreaking research and discoveries have marked the past year at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL). The Laboratory has advanced on all fronts and is expanding into new ones, and Quest reports on all the excitement around these activities in the 2020 edition.
All efforts to replicate in tokamak fusion facilities the fusion energy that powers the sun and stars must cope with a constant problem — transient heat bursts that can halt fusion reactions and damage the doughnut-shaped tokamaks. These bursts, called edge localized modes (ELMs), occur at the edge of hot, charged plasma gas when it kicks into high gear to fuel fusion reactions.
Vincent Graber, a doctoral student in mechanical engineering at Lehigh University, has won a highly competitive award from the U.S Department of Energy (DOE) that he will use to conduct research at the DOE’s Princeton Plasma Physics Laboratory (PPPL) on the design of a critical device to help bring the fusion energy that powers the sun and stars to Earth.
Blobs can wreak havoc in plasma required for fusion reactions. This bubble-like turbulence swells up at the edge of fusion plasmas and drains heat from the edge, limiting the efficiency of fusion reactions in doughnut-shaped fusion facilities called “tokamaks.” Researchers at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) have now discovered a surprising correlation of the blobs with fluctuations of the magnetic field that confines the plasma fueling fusion reactions in the device core.
New aspect of understanding
A major roadblock to producing safe, clean and abundant fusion energy on Earth is the lack of detailed understanding of how the hot, charged plasma gas that fuels fusion reactions behaves at the edge of fusion facilities called “tokamaks.” Recent breakthroughs by researchers at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) have advanced understanding of the behavior of the highly complex plasma edge in doughnut-shaped tokamaks on the road to capturing the fusion energy that powers the sun and stars.
Princeton Plasma Physics Laboratory is a U.S. Department of Energy national laboratory managed by Princeton University.
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