Joel Rogers has published new Polywell simulations. Get it while it’s hot:
http://www.plasma.ee.kansai-u.ac.jp/iec2010/pdf/pdf_slides_posters/Rogers2.pdf
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Prometheus Fusion Perfection 
two things that strike me in that:
1. why the hell did he use square magnets? that’s going to result in a lot more electron loss i.e. power loss than something more “conformal to the B-fields” as was said in the google presentation, such as, say, toroidal magnets (which is far more typical anyways).
2. i don’t see him mention anywhere that the magnetic field strength will grow at R^2. (this is because in an electromagnet it’s proportional to current times area). that might account for the difference between his r^3 obervations and bussard’s r^5 calculations.