News & Views |
Featured
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Demonstration of hot-spot fuel gain exceeding unity in direct-drive inertial confinement fusion implosions
Inertial confinement fusion experiments in a direct-drive configuration report more energy produced in deuterium–tritium fusion reactions than the amount of energy in the central part of the plasma created by laser irradiation of the fuel capsule.
- C. A. Williams
- , R. Betti
- & E. M. Campbell
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Article |
Demonstration of a hydrodynamically equivalent burning plasma in direct-drive inertial confinement fusion
Hydro-equivalent scaling of recent direct-drive inertial confinement fusion implosions shows that a burning plasma can be achieved with a higher laser energy.
- V. Gopalaswamy
- , C. A. Williams
- & C. Deeney
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News & Views |
Burning plasma surprise
In a burning plasma, fusion-born α particles are the dominant source of heating. In such conditions, the deuterium and tritium ion energy distribution deviates from the expected thermal Maxwellian distribution.
- Stefano Atzeni
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Article |
Evidence for suprathermal ion distribution in burning plasmas
Inertial confinement fusion experiments reveal a departure from the expected hydrodynamic behaviour of a plasma when the fusion reactions become the primary source of plasma heating.
- E. P. Hartouni
- , A. S. Moore
- & A. B. Zylstra
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Article |
Enhanced performance in fusion plasmas through turbulence suppression by megaelectronvolt ions
Experiments at the Joint European Torus tokamak show improved thermal ion confinement in the presence of highly energetic ions and Alfvénic instabilities in the plasma.
- S. Mazzi
- , J. Garcia
- & I. Zychor
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Perspective |
Disruption prediction with artificial intelligence techniques in tokamak plasmas
Tokamak plasmas are prone to sudden collapses that terminate the nuclear fusion reactions. This perspective discusses the prediction of these so-called disruptions with artificial intelligence techniques.
- J. Vega
- , A. Murari
- & I. Zychor
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Letter
| Open AccessDesign of inertial fusion implosions reaching the burning plasma regime
In burning plasma, alpha particles from fusion reactions are the dominant source of heating. The design choices that resulted in reaching this state in experiments at the National Ignition Facility are reported.
- A. L. Kritcher
- , C. V. Young
- & G. B. Zimmerman
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Article
| Open AccessObservation of a reduced-turbulence regime with boron powder injection in a stellarator
In stellarators, turbulence is detrimental for the confinement of the plasma. In the Large Helical Device, a confinement regime with reduced turbulence and improved confinement is observed.
- F. Nespoli
- , S. Masuzaki
- & T. Morisaki
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Comment |
A brief history of nuclear fusion
Since the 1950s, international cooperation has been the driving force behind fusion research. Here, we discuss how the International Atomic Energy Agency has shaped the field and the events that have produced fusion’s global signature partnership.
- Matteo Barbarino
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Letter |
Impact of the Langdon effect on crossed-beam energy transfer
In inertial confinement fusion experiments, the effect of the overlapping laser beams on the plasma is predicted to lead to a distortion of the electron distribution function, which has now been observed in experiments.
- David Turnbull
- , Arnaud Colaïtis
- & Dustin H. Froula
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News & Views |
Zirconium isotope found to be a neutron poison
Zirconium alloys are widely used as cladding material in nuclear reactors due to their neutron transparency. Now, it is shown that 88Zr has a surprisingly high neutron capture cross-section exceeding that of other zirconium isotopes by six orders of magnitude.
- Stephan Heinitz
- & Ulli Köster
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Article |
3D field phase-space control in tokamak plasmas
A theoretical and numerical approach, validated by experiments at the KSTAR facility, shows how magnetohydrodynamic instabilities in tokamak plasmas can be efficiently controlled by a small relaxation of the confining field into a 3D configuration.
- Jong-Kyu Park
- , YoungMu Jeon
- & Michael C. Zarnstroff
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Magnetic configuration effects on the Wendelstein 7-X stellarator
Results from the first experimental campaign of the Wendelstein 7-X stellarator demonstrate that its magnetic-field design grants good control of parasitic plasma currents, leading to long energy confinement times.
- A. Dinklage
- , C. D. Beidler
- & M. Zuin