Extreme Plasma Theories Put to the Test
2012 08 08

From: ScienceDaily.com

The first controlled studies of extremely hot, dense matter have overthrown the widely accepted 50-year-old model used to explain how ions influence each other’s behavior in a dense plasma. The results should benefit a wide range of fields, from research aimed at tapping nuclear fusion as an energy source to understanding the inner workings of stars.

The study also demonstrates the unique capabilities of the Linac Coherent Light Source (LCLS) X-ray laser at the U.S. Department of Energy (DOE)’s SLAC National Accelerator Laboratory. While researchers have created extremely hot and dense plasmas before, LCLS allows them to measure the detailed properties of these states and test a fundamental class of plasma physics for the first time ever.


The peaks on this chart represent key energy signatures produced in a dense ultrahot plasma, which for the first time allow detailed measurements of the effects of this plasma environment.



Plasma is sometimes referred to as the fourth state of matter -- alongside solid, liquid and gas -- and in this case it was hundreds of times hotter than the surface of the sun (2 million kelvins or 3.6 million degrees Fahrenheit). These measurements, reported by an international team of researchers and published this week in Physical Review Letters, contradict the prevailing model that scientists have used for a half-century to understand the conditions inside plasmas.

"We don’t think this could have been done elsewhere," said Justin Wark, leader of a group at Oxford University that participated in the study. "Having an X-ray laser is key."

The international research team, which made the plasma by targeting super-thin aluminum with X-rays at LCLS, reported its initial results in January. Now, in a second study based on a new analysis of data from the same experiment, the group tackled another question: How are atoms in such a hot, dense plasma affected by their environment?

[...]


Read the full article at: sciencedaily.com







Related Articles
Plasma Rain on the Sun
Huge Magnetic Plasma ’Snake’ Spotted On the Sun
Our Evolving Solar System: Plasma, Polar Reversals, and 2012
Plasma Lasers for Shielding - and Advertising
The World Axis, Cosmic Axis, or Axis Mundi. Plasma Mythology (Video)


Latest News from our Front Page

If Someone Secretly Controlled What You Say, Would Anyone Notice?
2014 10 01
The subject enters a room in which a 12-year-old boy is seated. A 20-minute conversation ensues. The subject quizzes the boy about current events and other topics to get a sense of his intelligence and personality. But the boy is not what he appears to be. Unbeknownst to the subject, the boy is wearing a radio receiver in his ear, and ...
Obama has had accurate intelligence about ISIS since BEFORE the 2012 election, says administration insider
2014 10 01
‘President Barack Obama’s intelligence briefings have provided him with specific information since before he won re-election in 2012 about the growing threat of the terror group now known alternatively as ISIS and ISIL, an administration insider told MailOnline on Monday. ‘Unless someone very senior has been shredding the president’s daily briefings and telling him that the dog ate them, highly accurate ...
Can holding a magnet against your head help defeat depression?
2014 10 01
Former GP Sue Mildred suffered from crippling depression and anxiety for 20 years. On two occasions it was so severe that she ended up in hospital, and for 15 years she was unable to work. Sue, 51, has tried antidepressants, talking therapies and, out of desperation, even ECT (electro-convulsive therapy), where an electric current is passed through the brain. This did ...
Extremists to have Facebook and Twitter vetted by anti-terror police
2014 09 30
Theresa May to announce new Extremist Disruption Orders to strengthen counter-terrorism if the Tories win the next general election Extremists will have to get posts on Facebook and Twitter approved in advance by the police under sweeping rules planned by the Conservatives. They will also be barred from speaking at public events if they represent a threat to “the functioning of democracy”, ...
Scottish Independence: Protesters demand revote
2014 09 30
Pro-independence campaigners gathered outside the Scottish Parliament for the second day in a row, this time to demand a revote of the September 18 referendum. While yesterday’s “Rally For A Revote” saw the return of Saltires and Yes banners to Holyrood, it did not match the turnout for the “Voice Of The People” rally held on Saturday, when up 3000 people ...
More News »