NIF Aims For the Ultimate Green Energy Source

theodp writes "Edward Moses and his team of 500 scientists and engineers at Lawrence Livermore's National Ignition Facility are betting $3.5B in taxpayer money on a tiny pellet they hope could produce an endless supply of safe, clean energy. By the fall of 2010, the team aims to start blasting capsules containing deuterium-tritium fuel with 1.4 megajoules of laser power, a first step towards the holy grail of controlled nuclear fusion. Not all are convinced that Moses will lead us to the promised land. 'They're snake-oil salesmen,' says Thomas Cochran, a scientist with the Natural Resources Defense Council. Moses, for his part, seems unfazed by the skepticism, saying he's confident that his team will succeed."

Comments

Mirror of the mirror

[Geoffrey.landis]

What bothers me is that, back in the 70s, LIvermore built the Mirror Fusion Test Facility, at a cost of somewhat over a billion dollars, to test a fusion concept. The project was cancelled by the Reagan administration the day the facility was finished.

http://en.wikipedia.org/wiki/Mirror_Fusion_Test_Facility

Do we have more stick-to-it spirit these days? Or is this another few billion dollars spent with no other purpose than to improve the economy of Livermore, California?

Re:Mirror of the mirror

[WaywardGeek]

Bush Jr also canceled all the funding for fusion experiments. It's the only reason we ever even heard of the Bussard Polywell, since the scientists were free to talk about it after their contract with the Navy ended. Of course, now that the Navy funding is back, we're not allowed to hear how development is going.

The obvious conspiracy theory is Big Oil doesn't like the threat of an alternative energy source, and they have a lot of clout at the White House when Republicans are in power. Other Bush Jr decisions included halting nearly all new permits for solar array power stations. So, the conspiracy theory has legs.

Re:Mirror of the mirror

[tgd]

If you're looking for conspiracy theories, there's a better one that is actually backed by better facts.

Its a common activity of the federal government (and arguably not an unreasonable one) to spend billions of dollars on projects that are not intended to ever succeed in the role they are sold to the public as, but rather to support industries that are deemed critical to national interest or security.

The ISS/Space Shuttle is probably the best and most widely known example. This was hundreds of billions spent to keep engineers and, more importantly, defense contractors, employed and solvent between DoD contracts, and to ensure that the skills they collectively had weren't lost through retirement or otherwise.

The US has the same problem with the skills around nuclear (fission and fusion) research and engineering, particularly since we stopped building and testing nuclear weapons. The argument has been made before, because the scientific justification is so bad, that many of these projects like the NIF are done for the same reason, and focus deliberately shifts around projects as the need for the project to actually produce something starts to come to a head.

IMO, the NIF alone is a giant waste of money, but if it serves as an act of corporate welfare to keep the scientists and contractors involved in the project active and up to date, then perhaps its not a bad investment.

But I don't think any experts who aren't getting a paycheck related to it really expect a viable solution to fusion power to come from it.

Three points

[cmowire]

Point one: Not spending money on fusion research is incredibly dumb. It's not likely to pan out in the near-term future, but there's plenty of ancillary science to be done on the subject. For example, the VASMIR space drive built on fusion research, it's just not hot enough to provoke fusion

Point two: Relying on fusion power to make for a short-term fix is also dumb. Especially if you think it's going to be safe and clean. The problem with fusion is how many neutrons it emits. Even when you use one of the fusion chains designed not to produce neutrons, you produce a good amount. The reactor core is going to be even more radioactive than a fission reactor core. And even if you get to a "Breakeven" point, that doesn't mean that you'll be price-competitive with other forms of power.

Fusion is easy. Just take a GIANT ball of gas, let it collapse into a star, and put solar panels around the star.

Point three: Calling it the Ultimate Green Energy Source is a cover story. A 2007 report by the National Research Council's Plasma Science Committee concluded that "NIF is crucial to the NNSA Stockpile Stewardship Program because it will be able to create the extreme conditions of temperature and pressure that exist on Earth only in exploding nuclear weapons and that are therefore relevant to understanding the operation of our modern nuclear weapons."

In other words, the NIF will be used, at least some of the time, to re-create the conditions inside of an exploding nuclear warhead so we can design new nukes without testing them and therefore violating the test ban treaties.

Re:Three points

[vlm]

The reactor core is going to be even more radioactive than a fission reactor core.

Why? Other than an appeal to authority, or FUD, I don't see it. And I'm fairly well educated in this area.

The inherent problem with "spent" fission fuel, is we have very little control over how the atoms fission. Generally you get about 1/3 and 2/3 chunks but a graph of the relative weights shows two wide peaks. The stuff thats stable for millions of years is harmless, because, well, its stable for millions of years before it does anything. Likewise for the stuff with a half life of a few seconds, like the silver isotopes, because an hour after shutdown its all reacted. But there are plenty of icky cobalt and strontium and other isotopes that have an annoying half life "around a human generation long" that are really hazardous biologically. So there is no way to run a fission reactor without accumulating icky radioactive waste. Don't want a fission reactor full of cobalt and strontium isotopes? Well, tough luck, that is an inherent byproduct of the fuel itself.

On the other hand, fusion doesn't use "stuff" that inherently involves bad half lives. Don't want a fusion reactor full of cobalt and strontium isotopes? Well then don't build the reactor out of it.

... solar panels ...

Ah I see it was all just astroturfing or something.

Re:Three points

[vlm]

Look up neutron activation. When neutrons are flying around in a nuclear (of any type) reactor core, some of them hit the material in the walls, causing the atoms to absorb a neutron and change isotopes. Which tends to result in a reactor core that is radioactive, even though it wasn't made of radioactive materials and didn't absorb any isotopes.

I know a lot about that topic. Lets make our reactor vessel out of iron. Nice and strong. We need a table of nuclides, but wikipedia is an adequate substitute. So, lets see what horrible long term waste results from neutron activation of iron.

http://en.wikipedia.org/wiki/Isotopes_of_iron

Most of the half lives are in the ms range. If you manage to strike the same atom simultaneously with five neutrons, you get a 44 day halflife, this is irrelevant in practice. Overall, neutron activation of iron is not a significant issue.

Some materials can be neutron activated, some simply cannot. Don't worry about distilled water, or lead.

The important point, is you choose the structural material so neutron activation is simply, inherently irrelevant. Hence the intense interest in material science in fusion reactors.

You could intentionally make a fusion reactors walls out of U-235 and generate tons of contamination, but why?

Re:synchronizing nearly 200 lasers

[joe_frisch]

These days synchronizing lasers to microseconds is easy. At LCLS/SLAC we synchronize our conventional and X-ray laser to 100 femtoseconds. We've also done 40 km of fiber to about 1 picosecond (and I think other labs have done better)