hohlraum

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hohlraum

[′hōl‚rau̇m]
(thermodynamics)
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Within a few hours of looking for applications of hohlraums outside their traditional role in fusion energy research, we were astonished to find they provided the perfect conditions for creating a photon collider.
Expert contributors cover such topics as progress in fast ignition, fusion targets, fundamentals of ICF Hohlraums, direct-drive inertial fusion and the acceleration of photons and quasi-particles.
The laser beams entered the hohlraums through a single hole at one end.
The goal was clearly achieved with a series of different-sized hohlraums irradiated with two nanosecond laser pulses of about eight trillion watts, which produced radiation temperatures in agreement with both theoretical expectations and previous experience from other facilities.
Additionally, the researchers wanted to fire some of these "very long" laser pulses into relatively small hohlraums in order to test computational and theoretical models of when a given hohlraum becomes extremely filled with plasma.
Various diagnostic instruments measured the X-ray spectra and radiation temperatures inside the hohlraum, and imaged the X-rays that were sufficiently energetic to exit through the hohlraum wall.
8 megajoule energy output, the scientists now have good reason to anticipate hohlraum experiments that are hotter, larger and of longer duration when all of NIF's 192 beams are fully operational.
The technique may lead to being able to replace the rigid hohlraums that are currently envisaged for indirect drive laser fusion.
For the z-pinch- driven hohlraum concept, recent experiments on Z with double-pinch hohlraums have demonstrated hohlraum energetics and coupling efficiencies that scale to high yield, and initial radiation symmetry and capsule implosion experiments have also been performed.