Computer simulation of the sequence of events in the reconnection process. Shown are contours of constant pressure at different times. As the current starts to become negative, the reconnection process begins and moves the center rapidly to the edge, effectively clamping the current in the center at zero
Doughnuts of plasma can be coaxed into configurations with hollow current rings, providing practical advantages over conventional “filled doughnut” shapes. Simulations suggest they will allow faster turn-on and greater efficiency of future nuclear fusion power plants.
Toroidal tokamaks, doughnut-shaped experimental fusion reactors, use a complex system of magnetic fields to hold a plasma together. Electrical currents flowing in the plasma itself are essential for making the internal magnetic fields needed for confinement. Plasma doughnuts normally carry large electrical currents throughout their volume but researchers expected the direction of the current could be changed back and forth.
However, in recent experiments at the Joint European Torus (JET) and JT-60U tokamaks in England and Japan, researchers tried to reverse the current and found, to their surprise, that the current doughnut became hollow.
David Harris | EurekAlert!
MEMS chips get metatlenses
21.02.2018 | American Institute of Physics
International team publishes roadmap to enhance radioresistance for space colonization
21.02.2018 | Biogerontology Research Foundation
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
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