Record Setting 500 Trillion-Watt Laser Shot Achieved 252
cylonlover writes "Researchers at the Lawrence Livermore National Laboratory's National Ignition Facility (NIF) have achieved a laser shot which boggles the mind: 192 beams delivered an excess of 500 trillion-watts (TW) of peak power and 1.85 megajoules (MJ) of ultraviolet laser light to a target of just two millimeters in diameter. To put those numbers into perspective, 500 TW is more than one thousand times the power that the entire United States uses at any instant in time."
Oww, it burns! (Score:4, Informative)
500 TW is more than one thousand times the *average* power that the entire United States uses at any instant in time.
Re:To put that in perspective (Score:5, Informative)
I heard a radio program (NPR I think) talking about this. The entire energy was about the same as rubbing your hands together for a few seconds.
Can anyone verify? It was early on a Monday morning, so it could ahve been the haze of the weekend...
Putting the hyperbole in perspective... (Score:3, Informative)
Off the cuff, 500 TW divided by 1.58 MJ implies the beam lasted only a few nanoseconds. So, "To put those numbers into perspective", 500 TW is more than one thousand times the power that the entire United States uses for a few nanoseconds."
Re:To put that in perspective (Score:5, Informative)
It's a bit more energy than that, but it's not a remarkable amount of energy. 1.85MJ is enough to turn just under 1L of water from 100C liquid phase to 100C vapour phase. ie - it's enough to boil 1L of water, if the water is already at the boiling point.
Latent heat of vapourization for H2O is about 2200 kJ/kg.
Re:Putting the hyperbole in perspective... (Score:5, Informative)
Sigh...
/., I'll use a car analogy: energy is analogous to how large the gas tank is (gallons, liters, etc.), power is how quickly that gas gets consumed (g/sec, mL/sec, L/100km, mpg). The average power consumption of the U.S. is a few hundred gigawatts...period. There is no gigawatts per second, or any other monstrous measure that pretends to be power, because the "per second" is already built into the Watt unit.
You are conflating power with energy. Don't feel bad: the press gets it wrong more than half the time.
Energy is a bulk quantity: a total amount. Power is a rate: how energy over how much time. Because this is
Correcting your statement: 1.85 MJ is more than one thousand times the energy that the entire United States uses in a few nanoseconds The original statement comparing 500 TW to the (average) power consumption of the U.S. was correct.
Re:Fusion Ignition (Score:5, Informative)
Re:One Thousand Times (Score:4, Informative)
Nope. The original definition (by some French guy, according to Wikipedia) was that 1 calorie heats one gram of water by 1 *C. I remember learning that the original definition was for one kilogram, that's why it was called kilocalorie, and was first measured by Joule. Wikipedia contradicts my history knowledge, but not my numbers.