Fusor Forums

Rex, Cathode construction: From what I’ve found neutron production is strongly related to cathode dimensions, and only weakly related (if at all) to cathode material. End cap patterns: One of the reasons I posted the endcap pix was I was hoping someone would tell me about the patterns. Anyway, my ta...

Guys, appreciate the kind words, glad I could help out in some way.

Below is a TIER comparison between my spherical fusor and the new cube. Jon Rosenstiel

Jim, Richard... Right you are, it's the activation that matters. To that end, I just attempted to duplicate (as best I could) Richard Hull's HEAS silver activation experiment. A 2" diameter piece of silver 0.007" thick was placed between two 4" x 4" x 2" thick PE blocks nestled up against one of the...

Richard, The cube’s neutron numbers at 40 kV, 10 mA with the original, aluminum cathode, ID= 0.5”, OD= 1.0”, L= 0.7” was around 5.5E+05 n/s (TIER), about one-half that of my fully conditioned spherical fusor. (1.0E+06 n/s) Note that unless otherwise specified 40 kV, 10 mA was used for all testing. N...

Richard,

Joe Gayo found an interesting paper on isotropy / anisotropy.

Link to Joe's post...
https://www.fusor.net/board/viewtopic.p ... 9&start=30

Link to the paper... (See pages 18 & 19)
https://ir.library.dc-uoit.ca/bitstream ... Leslie.pdf

Jon Rosenstiel

Richard,

I'll have some answers for you in a few days, I'm still trying to digest results I'm seeing from the titanium cathode.

Jon Rosenstiel

Titanium cathode testing. One of titanium's downsides is outgassing when it becomes red-hot.
Jon Rosenstiel

Richard,

The reaction may be isotropic in nature, but the neutrons coming out of the cube are definitely not. Both Joe and I have confirmed that the cube's neutron "output" or "flux" is about four times stronger in line with the plasma beam than at right angles to the beam.

Jon Rosenstiel

Jim, I think I may have figured this out, please let me know what you think. Off-axis tests using my BC-720 replica fast neutron detector showed that the faint circles seen on the cube’s endplates (image below) roughly define the outer limits of the cube’s neutron emission cone. Plugging the circle’...

Thanks for the pix David. Looks like I missed a good event.

Jon Rosenstiel