Hole boring in a DT pellet and fast ion ignition with ultra-intense laser pulses

Details Hole boring in a DT pellet and fast ion ignition with ultra-intense laser pulses Hole boring in a DT pellet and fast ion ignition with ultra-intense laser pulses

2009-03-22

arxiv.org/abs/0903.3718v1

Phys. Rev. Lett. 102, 025002 (2009)

Physics

Plasma Physics

4 pages

Scientific paper

10.1103/PhysRevLett.102.025002

Recently achieved high intensities of short laser pulses open new prospects in their application to hole boring in inhomogeneous overdense plasmas and for ignition in precompressed DT fusion targets. A simple analytical model and numerical simulations demonstrate that pulses with intensities exceeding 1022 W/cm2 may penetrate deeply into the plasma as a result of efficient ponderomotive acceleration of ions in the forward direction. The penetration depth as big as hundreds of microns depends on the laser fluence, which has to exceed a few tens of GJ/cm2. The fast ions, accelerated at the bottom of the channel with an efficiency of more than 20%, show a high directionality and may heat the precompressed target core to fusion conditions.

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