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Plasma devices to guide and collimate a high density of MeV electrons
Posted on Saturday, December 25, 2004 @ 14:11:06 UTC by vlad

Devices by R. KODAMA et al.
Nature 432, 1005 - 1008 (23 December 2004); doi:10.1038/nature03133

The development of ultra-intense lasers has facilitated new studies in laboratory astrophysics and high-density nuclear science, including laser fusion. Such research relies on the efficient generation of enormous numbers of high-energy charged particles.

For example, laser–matter interactions at petawatt (10^15 W) power levels can create pulses of MeV electrons with current densities as large as 10^12 A cm^-2. However, the divergence of these particle beams usually reduces the current density to a few times 10^6 A cm^-2 at distances of the order of centimetres from the source. The invention of devices that can direct such intense, pulsed energetic beams will revolutionize their applications. Here we report high-conductivity devices consisting of transient plasmas that increase the energy density of MeV electrons generated in laser–matter interactions by more than one order of magnitude. A plasma fibre created on a hollow-cone target guides and collimates electrons in a manner akin to the control of light by an optical fibre and collimator. Such plasma devices hold promise for applications using high energy-density particles and should trigger growth in charged particle optics.

Source: http://info.nature.com/cgi-bin24/DM/y/hRbT0GuiiA0Ch0Xsk0AZ

 
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