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- From: jtchew@csa3.lbl.gov (JOSEPH T CHEW)
- Newsgroups: sci.physics.fusion
- Subject: Re: inertial fusion
- Date: 29 Jul 92 20:19:43 GMT
- Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
- Lines: 47
- Message-ID: <25033@dog.ee.lbl.gov>
- References: <1992Jul27.161712.14850@news.columbia.edu>
- Reply-To: jtchew@csa3.lbl.gov
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-
- >Does anyone know the state of research of inertial fusion is at?
- >How close to breakeven, compared to tokomaks? Is anyone besides LLNL is US or
- >world doing research on inertial fusion?
-
- Try Key, "Lasers generate plasma power," Physics World, August 1991, for
- a survey of the laser-based inertial fusion energy programs worldwide.
- The article is aging as an accurate description of what's going on in
- the mercurial world of big-science funding, but the semi-technical
- background is interesting.
-
- A proposed Nova upgrade/replacement at LLNL could get into the regime
- of scientific breakeven eventually, producing megajoule-range fusion
- output with megajoule-range drive beams. Of course, the "wall plug"
- efficiency would be rather less. A commonly accepted definition of
- "IFE," as distinguished from laboratory microfusion experiments, is
- 10 MJ in and 1000 MJ out, for a gain of 100x. D-T pellets capable of
- supporting this gain requirement, and also compatible with the drive
- beam in question, will be an important R&D area.
-
- The key areas of IFE R&D are somewhat different from those of MFE,
- because the questions are different. We have assurances, from a
- series of nuclear-weapon-driven experiments called Centurion-Halite,
- that IFE-relevant pellets can be driven and fused. The numbers are
- still classified, but the people who have access are permitted to
- show me a qualitative cartoon of where we are now (tiny pellets driven
- by today's lasers) and of Centurion-Halite results, with IFE in the
- middle. The big issue is how to drive the pellets in a way that is
- more cost-effective and causes fewer complaints from people living
- around the power station. :) That might turn out to be big lasers
- (which in any case would be necessary for pellet and maybe reactor
- R&D) or particle beams.
-
- Some scientists consider the latter approach to be especially
- promising. I'm writing this in a fugue state from the production of
- a published version of the Conceptual Design Report ("CDR" ~~ DOEspeak
- for "proposal") for the Induction Linac Systems Experiments, a step
- towards a driver based on heavy-ion beams from an induction linac.
- If you're really interested, drop me a note and I'll put you on the
- mailing list. We expect to get a go-ahead to start building it.
-
- The Germans are working on a synchrotron-based approach at GSI.
- I don't know whether Sandia is still running their proton diode,
- Particle Beam Fusion Accelerator II, but they've been pursuing the
- use of beams of light ions.
-
- --Joe
- "Just another personal opinion from the People's Republic of Berkeley"
-