Subscribe to our free daily newsletters
  Space Travel News  

Subscribe to our free daily newsletters

A bar magnet creates chaos in plasma
by Staff Writers
Washington DC (SPX) Jul 27, 2017

This is a localized glow region, the complex space charge configuration, near cathode surface with application of ~28G magnetic field. Image courtesy Shaw and AIP Publishing.

Placing a magnet on your refrigerator might hold up your calendar, but researchers from India's Saha Institute of Nuclear Physics found that placing one outside a plasma chamber causes a localized, fireball-like structure. This work may help understand plasma dynamics under these north-south, or dipolar, magnetic fields. They present their results this week in the journal Physics of Plasmas, from AIP Publishing.

When subjected to the magnetic dipole field produced by a bar magnet, the researchers found that a localized glow appeared near the cathode surface. According to their paper, this localization is due to enhancement of the degree of ionization because of electron confinement in the magnetic field near the negatively charged cathode surface. They found that the intensity of the glow region increased as they increased the strength of the magnetic field.

Traditionally, work in this field is conducted by keeping a permanent magnet inside a plasma chamber - this means there is no way to vary field strength or field line structure. By placing the bar magnet on the outside of the plasma chamber, the authors of this paper could change the position of the magnet and vary the strength of the magnetic field.

"Though bar magnets have been used in plasma experiments, the focus was mainly on the measurement of plasma equilibrium parameters like density, potential and other fluctuation measurements," said lead author Pankaj Kumar Shaw. "In our opinion, this is the first effort to investigate nonlinear dynamical phenomena of the fluctuations under dipolar magnetic field."

In these previous studies, the introduction of a magnetic field to plasma would cause the plasma fluctuation to go from order to chaos. Placing the bar magnet outside the plasma chamber, Shaw and his colleagues found that increasing the magnetic field strength revealed a transition from order to chaos via a process of a period doubling bifurcation.

"Following a particular sequence from order to chaos via [a] period-doubling route was unexpected," said Shaw, who added that while previous experiments had reported the emergence of turbulence and chaos from introducing a magnetic field, that this was the first experiment to report a doubling route to chaos with magnetic field strength.

"Changing position of the bar magnet varied the strength of magnetic field over 1-10G," Shaw said. "This observation in such a low range of magnetic field was surprising."

In the future, Shaw said his team hopes to design a new plasma experiment that incorporates more bar magnets and investigate their effects on plasma dynamics.

The results of this paper could be important in space plasma research, said Shaw. Specifically, it could help scientists understand effects such as magnetic anomalies on solar wind-lunar surface interactions. It could also prove vital in other areas of plasma applications such as plasma processing of materials where magnetic fields are extensively used.

Knowing the "root cause of plasma instabilities is important for applications of plasma-surface interactions," Shaw said. Furthermore, he thinks this could help educate a future generation of physicists. "This simple experiment can be used to teach various aspects of plasma physics, nonlinear dynamics, and time series analysis to high school students."

Research Report: "A localized cathode glow in the presence of a bar magnet and its associated nonlinear dynamics"

CCNY physicists master unexplored electron property
New York NY (SPX) Jul 27, 2017
While the charge and spin properties of electrons are widely utilized in modern day technologies such as transistors and memories, another aspect of the subatomic particle has long remained uncharted. This is the "valley" property which has potential for realizing a new class of technology termed "valleytronics" - similar to electronics (charge) and spintronics (spin). This property arises ... read more

Related Links
American Institute of Physics
Understanding Time and Space

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once

credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly

paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

For Moratorium on Sending Commands to Mars, Blame the Sun

Tributes to wetter times on Mars

Opportunity will spend three weeks at current location due to Solar Conjunction

Curiosity Mars Rover Begins Study of Ridge Destination

Living in Deep Space: Lockheed Martin to Build Full-Scale Prototype of NASA Cislunar Habitat

How to rescue a Moonwalker in need

Japanese Space Agency Proposes Plan to Send Astronauts to Moon

Japan reveals plans to put a man on moon by 2030

New Horizons Video Soars over Pluto's Majestic Mountains and Icy Plains

Juno spots Jupiter's Great Red Spot

New evidence in support of the Planet Nine hypothesis

NASA's New Horizons Team Strikes Gold in Argentina

A New Search for Extrasolar Planets from the Arecibo Observatory

Gulf of Mexico tube worm is one of the longest-living animals in the world

Molecular Outflow Launched Beyond Disk Around Young Star

Eyes Wide Open for MASCARA Exoplanet Hunter

ISRO Develops Ship-Based Antenna System to Track Satellite Launches

Elon Musk says successful maiden flight for Falcon Heavy unlikely

Russia to Supply Largest Ever Number of Space Rocket Engines to US This Year

Aerojet Rocketdyne tests Advanced Electric Propulsion System

China develops sea launches to boost space commerce

Chinese satellite Zhongxing-9A enters preset orbit

Chinese Space Program: From Setback, to Manned Flights, to the Moon

Chinese Rocket Fizzles Out, Puts Other Launches on Hold

Ancient, massive asteroid impact could explain Martian geological mysteries

Pitted Materials in Craters Could Indicate Buried Ice on Asteroids

Bizarro comet challenging researchers

NASA'S First Asteroid Deflection Mission Enters Next Design Phase

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement