new nanodevice creates near perfect electron stream

happyjack27 · Post by **happyjack27** » Thu Jul 12, 2012 2:31 am

new nanodevice creates near perfect electron stream

http://science.slashdot.org/story/12/07 ... m=facebook

...a possible dramatic improvement for electron guns down the road - when the amperage gets high enough.

hanelyp · Post by **hanelyp** » Thu Jul 12, 2012 4:31 pm

My impression of the electron injection in a polywell is that it mostly depends on the stream following the right magnetic field line going in.

D Tibbets · Post by **D Tibbets** » Fri Jul 13, 2012 4:25 pm

The abstract mentions a billion electrons. It would have to be scaled up some, like ~ 10^12 times.

I suspect it would work better than a headlight fillament which emits omnidirectionally at low voltage. The high voltage on the magrid would quickly pull them towards a central location both due to the symetric electrical field on the magrid can surrounding the cusp, and the converging magnetic field. A collumated tight beam starting point may help some, but how much is an open question.

D Tibbets

MSimon · Post by **MSimon** » Fri Jul 13, 2012 4:30 pm

D Tibbets wrote:The abstract mentions a billion electrons. It would have to be scaled up some, like ~ 10^12 times.

I suspect it would work better than a headlight fillament which emits omnidirectionally at low voltage. The high voltage on the magrid would quickly pull them towards a central location both due to the symetric electrical field on the magrid can surrounding the cusp, and the converging magnetic field. A collumated tight beam starting point may help some, but how much is an open question.

D Tibbets

Concur. And just to go OT a bit. Are you a tube guy? A dying art.

hanelyp · Post by **hanelyp** » Fri Jul 13, 2012 7:41 pm

If you don't know or pick up some vacuum tube know how, you aren't taking the polywell seriously.

D Tibbets · Post by **D Tibbets** » Sat Jul 14, 2012 11:18 pm

I'm not a vacuum tube guru, but I recognize the importance of that perspective. Many seem not to appreciate what has already been practically demonstrated with vacuum tubes. Bussard lamented this condition in younger physicists. At least one plasma physicist on this forum in the past has avoided challenging or discussing vacuum tube issues when they have been presented as counters to his arguments.. This has given me the impression that he is naive towards this technology.

Dan Tibbets