(Following up) Actually Google Books *does* have the first paper Lerner cites:
http://books.google.com/books?id=JtdClDWSlOYC&q=lerner#v=onepage&q=mg&f=false
in which he accidentally a world-record magnetic field (without thinking it worth mentioning). There is no direct magnetic field probe whatsoever. There is a huge train of assumptions from which he derives that 0.4 gigagauss. It all hinges on a measurement of
low x-ray power P emitted by some fusion shot, coupled with what he describes as a
upper bound (from fusion neutron production) on the density n in some transient plasmoid. From this he finds the volume V proportional to P/n^2. (Except, he fails to mention, that's now a
lower bound on the volume, not a measurement of it.) He has some other idea---poorly constrained---that the tiny transient plasmoid has to obey a bunch of field-compression conservation laws,
and that it has to have a B field large enough to confine 1 MeV tritium ions in a tiny radius. If you believe that constraint,
and if you take use his claimed tiny radius ... yes, the B field has to be large in order to bend tritions around in this tiny r. But by now he's forgotten that r is a
lower bound on the radius. The B field has to be
no bigger than 0.4 GG to bend tritons in a circle
no smaller than 6 microns. That's all he has actually shown, even allowing that all his other assumptions are correct.
So: Lerner's paper, which he claims is the proof-of-concept that Focus Fusion has reached a world-record 0.4 GG, in fact contains only a calculation (not a measurement!) suggesting fields
somewhere between 0 and 0.4 gigagauss. In other words, it's no proof of concept at all; Lerner has misrepresented it.
I hope some of his IndieGoGo funders are reading this: Do not fund this campaign, people. Lerner's fusion contraption, is
no better than that of any other garage-tinkerer's. Lerner's record of
running, analyzing, and reporting the behavior of his machine is
terrible, and his presence in the field does more to
hurt fusion than to help it.