Farnsworth biography - Fusor development

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Farnsworth biography - Fusor development

Postby jlumartinez » Fri Nov 06, 2009 1:19 am

This is a link to a chapter from the book "Lost Science" (by G. Vassilatos) about Farnsworth´s life and the historical development of the fusor:

http://www.hbci.com/~wenonah/history/fusor.htm

Another link to fusor history: http://www.farnovision.com/chronicles/f ... latos.html

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Re: Farnsworth biography - Fusor development

Postby CharlesKramer » Sun Mar 09, 2014 7:01 pm

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Re: Farnsworth biography - Fusor development

Postby KitemanSA » Thu Mar 13, 2014 3:52 am


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Re: Farnsworth biography - Fusor development

Postby CharlesKramer » Sun Mar 16, 2014 8:54 pm

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Re: Farnsworth biography - Fusor development

Postby D Tibbets » Wed Mar 19, 2014 12:07 am

Hirsch was a research fellow in Farnsworths lab in the late 60's. I'm not sure whar his machine was called, but it recorded neutron outputs of ~ a billion per second. Perhaps higher as reported above. This was at ~ 100 KeV or greater, and I think with D-D fuel. I'm uncertain if D-T was used, but if so the fusion output may have been ~ 10-100 times higher at more modest voltages (D-T fusion cross section peak is at ~ 50 KeV.

Bussard mentioned this record in the context of WB 6. His claims of ~ 500 million neutrons per second matched the "record" (within an order of magnitude), and importantly did it at energies of 10 KeV, where the D-D fusion cross section is ~ 100 times less.

This is nice but not very useful. What makes the Polywell remarkable (if claims are true) is how much it scales up with increased magnetic field strengths. Keep in mind that a few billion neutrons per second only represents a fusion output of a few milliwatts.

Dan Tibbets
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Re: Farnsworth biography - Fusor development

Postby CharlesKramer » Tue Mar 25, 2014 2:57 pm

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Re: Farnsworth biography - Fusor development

Postby hanelyp » Tue Mar 25, 2014 9:04 pm

Power output for magnetic confinement devices scales as B^4R^3 pretty universally. Presuming losses scale slower than R^3, you can get better fusion gain by going bigger. The problem they've run into building bigger tokomaks is new unanticipated turbulence loss modes, related to the magnetic field curvature and profile. The polywell is hoped to be immune to such instability modes with the magnetic field getting uniformly stronger as the plasma pushed it away from the center.
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Re: Farnsworth biography - Fusor development

Postby CharlesKramer » Fri Mar 28, 2014 11:51 am

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Re: Farnsworth biography - Fusor development

Postby CharlesKramer » Fri Mar 28, 2014 11:54 am

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Re: Farnsworth biography - Fusor development

Postby hanelyp » Fri Mar 28, 2014 3:46 pm

The line "The high magnetic field in the device (up to 13 Tesla on the plasma axis, more than twice that of ITER) ..." appears relevant to IGNITOR scale. It looks like they're trying to push the B^4 factor.
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