Posts Tagged ‘Alan Partridge’

Fusion: Hotter Than the Sun

February 3, 2010

Incidentally light (and heat) leaving the sun travels for 8 minutes, exactly the same time it takes to turn an apple pie into a lethal weapon.  Fusion power is what powers the sun and there is hopes that it could be harnessed here on earth.  At the centre of the sun hydrogen atoms (specifically the isotopes deuterium and tritium) fuse together to produce helium, this process releases an enormous amount of energy.  Scientists hope to one day reproduce this process on earth, and a new finding has brought us one step closer.

Experiments at the National Ignition Facility in the US have shown that ignition of fusion fuel could be achieved using a laser.  By firing 192 lasers at a tiny pellet of deuterium and tritium, plasma was successfully produced without obscuring the lasers themselves.  Handling plasma has always presented a hurdle to progressing with fusion power.  At temperatures of 109 K very little can survive, so creating vessels to contain the plasma requires more than just reinforced steel.

The ITER is the vessel that scientist hope can contain the plasma of a fusion reaction so that heat can be extracted from it.  A collaborative effort between 7 national and supranational bodies, the ITER is due to begin construction of its tokamak in 2011.  A tokamak uses magnetic fields to confine the plasma rather than physical methods, this allows the plasma to be created without damaging any structures.  If all goes to plan construction should be complete by 2018.  Bringing us ever so closer to creating our own mini-sun here on earth.