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Re: Magnetically assisted ionization

Posted: Sat Mar 14, 2020 9:19 pm
by Richard Hull
Wow, I am really enthusiastic about your design. I bet it will work out OK. I'll also bet it will be a real performer if D2 ever finds its way inside.

All the best if this gets built. Keep us in the loop. In good hands, this should beat anything the Farnsworth team put together that used D-D fusion. Just the right amount of complexity that can be readily assembled by a focused amateur.

Richard Hull

Re: Magnetically assisted ionization

Posted: Sat Mar 14, 2020 9:58 pm
by Dan Knapp
Hotta's group in Japan did considerable study of this subject in a cylindrical fusor and reported their results at the US-Japan IEC Workshop in College Park, MD, in 2012. Unfortunately, the web site where the presentations at that meeting were posted has since been taken down. They used mutiple coils on the outside of their cylindrical anode chamber and tried various combinations of different current directions in the coils. Their best results yielded a threefold increase in neutron production with the added magnetic fields. Their conclusion was that adding magnetic field near the anode confined the electrons and hence electron impact ionization of deuterium to the area nearest the anode, which would yield the highest energy ions after acceleration toward the cathode. I'm not aware of a comparable study in a spherical fusor or one made from a cross, but this should certainly be a fruitful area to explore. If the Hotta group explanation of the effect is correct, one would want to concentrate the magnetic field to areas nearest the anode.

Re: Magnetically assisted ionization

Posted: Sun Mar 15, 2020 4:37 am
by Richard Hull
In my post in the past I noted the movable coils on the cross arms might be jammed against the anode ends of the arms.

Richard Hull

Re: Magnetically assisted ionization

Posted: Sun Mar 15, 2020 5:24 pm
by Maciek Szymanski
Richard Hull wrote:
Sat Mar 14, 2020 9:19 pm
Wow, I am really enthusiastic about your design.
Richard, it’s very encouraging to hear it from you. I don’t have such high expectations for this design and will be happy if I can learn something new about ionization and ion circulation in the fusor. I’m going to order parts on monday (shells, inox sphere for cathode and laser cut blanks for flanges). Most of the fittings I’ve in hand, so I hope to have it assembled in two months.

Re: Magnetically assisted ionization

Posted: Sun Mar 15, 2020 9:08 pm
by Richard Hull
I wish you well on this. I am lagging behind in getting my 6 way cross Fusor V up and running. I have some vacuum part on order now.

Richard Hull