Subscribe free to our newsletters via your
. Energy News .




ENERGY TECH
Uniformity: the secret of better fusion ignition
by Staff Writers
Heidelberg, Germany (SPX) Oct 22, 2013


File image.

One of the ways to achieve thermonuclear fusion is through a controlled reaction between two light variants of hydrogen, called deuterium and tritium. Mauro Temporal, from the Ecole Normale Superieure Cachan, in France, and colleagues have made theoretical calculations indicating how best to improve the ignition stage of fusion reaction.

Their approach, described in a paper published in EPJ D, involves increasing the uniformity of irradiation using high-power laser beams on the external shell of a spherical capsule containing a mix of deuterium and tritium.

Reaching uniformity of irradiation matters. Indeed, if it can be achieved, it rapidly heats up the capsule and makes it implode, compressing the fuel inside to very high density. This, in turn, induces the compression and heating of a small amount of fuel in a hot spot, which is a sine qua non for reaching the ignition conditions of thermonuclear fusion to produce large energy quantities.

Temporal and colleagues analyse the possibility of using the UK-based Orion facility's high-power laser beams to study uniformity. Orion has a few nanosecond-long pulse - 5 kiloJoules in energy - which cannot achieve ignition, but can help to test ways to produce uniform irradiation from non-uniformly distributed beams: a technique called Polar Direct Drive.

Specifically, the authors use numerical simulations to analyse the uniformity of the illumination of a spherical target both in the case of circular or elliptical laser intensity profiles. Their work also takes into account other potentially disruptive factors. These include beam-to-beam power imbalance, laser-beam pointing error and target positioning error.

They demonstrate that this approach reduces considerably the non-uniformity of the capsule irradiation-by 50 percent and 35 percent, for elliptical and circular intensity profiles respectively.

M. Temporal, B. Canaud, W.J. Garbett, F. Philippe, and R. Ramis (2013), Polar Direct Drive Illumination Uniformity Provided by the Orion Facility, European Physical Journal D, DOI 10.1140/epjd/e2013-40362-4

.


Related Links
Springer
Powering The World in the 21st Century at Energy-Daily.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




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





ENERGY TECH
Fusion, anyone?
Washington DC (SPX) Sep 25, 2013
The dream of igniting a self-sustained fusion reaction with high yields of energy, a feat likened to creating a miniature star on Earth, is getting closer to becoming reality, according the authors of a new review article in the journal Physics of Plasmas. Researchers at the National Ignition Facility (NIF) engaged in a collaborative project led by the Department of Energy's Lawrence Liver ... read more


ENERGY TECH
Russia switches Greenpeace piracy charge to 'hooliganism'

US power plant pollution declines 10 percent from 2010

Firms eye power generation in post-Fukushima Japan

South Korean president calls for global energy cooperation

ENERGY TECH
UMD Researchers Address Economic Dangers of 'Peak Oil'

Uniformity: the secret of better fusion ignition

China media hail Russia ties after $85 bn oil deal

China heads to South America in global energy 'scramble'

ENERGY TECH
Spain launches first offshore wind turbine

Key German lawmaker: End renewable energy subsidies by 2020

Installation of the first AREVA turbines at Trianel Windpark Borkum and Global Tech 1

Trump's suit to halt wind farm project to be heard in November

ENERGY TECH
New NRDC Crowdfunding Campaign to Connect Schools to Solar Power

ecoSolargy's End-To-End HDPV Solution Reduces PV System Costs

Santerno Introduces New PV Power Plant Controller that Provides Single Point of Control

Solar Grid Storage and AllCell Partner to Help Ensure Grid Stability

ENERGY TECH
EU to examine govt aid for UK nuclear deal

India starts up controversial Russia-backed nuclear plant

British nuclear plant deal seen as spur to more development

UN atomic agency suffers 'malware' attack

ENERGY TECH
Scientists Identify Key Genes for Increasing Oil Content in Plant Leaves

Ethanol Safety Seminar Planned in Tacoma

US Biodiesel Production Surpasses Set Target for Second Straight Year

AREVA awarded a contract for the construction of a biomass power plant in the Philippines

ENERGY TECH
Is China Challenging Space Security

NASA's China policy faces mounting pressure

Ten Years of Chinese Astronauts

NASA vows to review ban on Chinese astronomers

ENERGY TECH
ADB urges East Asian giants to work together on climate change

Investment to limit climate change is lagging: study

US Supreme Court to hear greenhouse gas cases

'Stadium waves' could explain lull in global warming




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal 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. 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