Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

First 3-D Magnetic Reconnection Measurements

08.11.2002


In work that promises new insights into the cosmos and fusion-energy production alike, physicists have reported they have made the first three-dimensional laboratory measurements of magnetic reconnection, the main process by which magnetic fields release energy in the universe.


Data show reconnection of two partially merging rings of plasma. The green and gray field lines represent private and reconnected field lines, respectively. The red reconnected field line crosses normal to the reconnection plane, indicating a 3-D character.



Magnetic reconnection is the phenomenon in which magnetic energy in a plasma is rapidly converted to heat and jets of energetic particles. This process is thought to heat the solar corona, the outer atmosphere of the sun, to temperatures 1000 times greater than the sun’s surface itself, as well as to accelerate particles to high energies, possibly even to the very high energies of cosmic rays. Magnetic reconnection is also an important process in some experimental fusion energy reactors that use magnetic fields to confine the plasma.

The physical picture of magnetic reconnection is of two strands of magnetized plasma with oppositely directed magnetic field merging together. Until recently, this process has been studied only in two dimensions--theoretically, computationally, and experimentally.


Now, 3D experimental measurements of magnetic reconnection have been made at the Swarthmore Spheromak Experiment (SSX) at Swarthmore College. At SSX, physicists merge rings of magnetized plasma called spheromaks. Compact probes measure up to 600 magnetic field components more than a million times a second. This permits detailed studies of the ever-changing 3D magnetic structures resulting from these experiments. Measurements of the spheromaks reveal a swept and sheared magnetic structure in the reconnection region (see figure).

With SSX, researchers hope to elucidate fundamental plasma physics processes on the sun and understand new plasma structures in magnetic confinement fusion machines.

Contacts
Michael Brown (610) 328-8648, doc@swarthmore.edu, Swarthmore College
Chris Cothran (610- 690-5778, ccothra1@swarthmore.edu, Swarthmore College

David Harris | EurekAlert!
Further information:
http://www.aps.org/meet/DPP02/baps/press/press4.html
http://www.aps.org/meet/DPP02/baps/abs/S2210001.html

More articles from Physics and Astronomy:

nachricht A new path for electron optics in solid-state systems
15.07.2020 | ETH Zurich Department of Physics

nachricht Black phosphorus-based van der Waals heterostructures for mid-infrared light-emission applications
13.07.2020 | Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, Chinese Academy

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A new path for electron optics in solid-state systems

A novel mechanism for electron optics in two-dimensional solid-state systems opens up a route to engineering quantum-optical phenomena in a variety of materials

Electrons can interfere in the same manner as water, acoustical or light waves do. When exploited in solid-state materials, such effects promise novel...

Im Focus: Electron cryo-microscopy: Using inexpensive technology to produce high-resolution images

Biochemists at Martin Luther University Halle-Wittenberg (MLU) have used a standard electron cryo-microscope to achieve surprisingly good images that are on par with those taken by far more sophisticated equipment. They have succeeded in determining the structure of ferritin almost at the atomic level. Their results were published in the journal "PLOS ONE".

Electron cryo-microscopy has become increasingly important in recent years, especially in shedding light on protein structures. The developers of the new...

Im Focus: The spin state story: Observation of the quantum spin liquid state in novel material

New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices

Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...

Im Focus: Excitation of robust materials

Kiel physics team observed extremely fast electronic changes in real time in a special material class

In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...

Im Focus: Electrons in the fast lane

Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.

Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Contact Tracing Apps against COVID-19: German National Academy Leopoldina hosts international virtual panel discussion

07.07.2020 | Event News

International conference QuApps shows status quo of quantum technology

02.07.2020 | Event News

Dresden Nexus Conference 2020: Same Time, Virtual Format, Registration Opened

19.05.2020 | Event News

 
Latest News

When Concrete learns to pre-stress itself

15.07.2020 | Architecture and Construction

New lithium battery charges faster, reduces risk of device explosions

15.07.2020 | Power and Electrical Engineering

A new path for electron optics in solid-state systems

15.07.2020 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>