Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A new entry in the science X-games

28.10.2003


45th Annual Meeting of the Division of Plasma Physics




The emerging field of high energy density physics has been described by a recent National Academy of Science report as the "X-games" of contemporary science. The term high energy density is used to describe matter with pressures more than 1 million times the pressure on the surface of the earth. While high energy density matter is extreme by terrestrial standards, it can be found throughout the universe in a number of astrophysical settings and can be made for short times and within small volumes in the laboratory. In an invited talk on Monday morning Mark Herrmann of DOE’s Lawrence Livermore National Laboratory will describe recent expaeriments that provide a new entry for the "X-games": the laser driven dynamic hohlraum.

The new entry, called a laser driven dynamic hohlraum, consists of a spherical, laser-driven implosion of a plastic shell filled with xenon. As this thin shell implodes it sweeps up the xenon and causes it to radiate x-rays. When enough radiating xenon has been swept up, the xenon begins to trap x-ray radiation on the inside, creating a time-evolving cavity of intense x-rays -- a dynamic hohlraum. With this technique, it may be possible to achieve very high energy densities on experiments at the National Ignition Facility, which began initial physics operations this year.


The initial experiments testing this concept have been carried out using the OMEGA laser at the University of Rochester’s Laboratory for Laser Energetics. Forty beams of OMEGA are used to directly drive a thin capsule filled with xenon gas (left panel). A shock is driven in the xenon, which radiates so strongly that it collapses to a thin dense layer. This dense xenon layer traps x-rays. An image is generated by 10 of the remaining beams (right panel). Initially a low level of signal may be seen due to the self-emission from the laser-heated plastic. After the drive beams turn off the radiography beams are turned on, and the remaining plastic and the thin, dense, shock in the Xenon may be seen as dark shadows. A region of low density plastic that has been created by the radiating shock separates the two dark bands. Simulations of this concept predict a hollow region that is in good agreement with the experiment.

Contacts
Mark Herrmann, LLNL, 925-422-6999

David Harris | American Physical Society
Further information:
http://www.aps.org/meet/DPP03/baps/abs/S120003.html
http://gk.umd.edu/DPP/press5.html

More articles from Physics and Astronomy:

nachricht Tracing aromatic molecules in the early universe
23.03.2017 | University of California - Riverside

nachricht New study maps space dust in 3-D
23.03.2017 | DOE/Lawrence Berkeley National Laboratory

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: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

When Air is in Short Supply - Shedding light on plant stress reactions when oxygen runs short

23.03.2017 | Life Sciences

Researchers use light to remotely control curvature of plastics

23.03.2017 | Power and Electrical Engineering

Sea ice extent sinks to record lows at both poles

23.03.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>