Search found 1199 matches

by Jon Rosenstiel
Sat Nov 09, 2019 11:22 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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...
by Jon Rosenstiel
Thu Oct 31, 2019 6:47 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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.
fusor vs fusor.png
fusor vs fusor.png (47.4 KiB) Viewed 521 times
Jon Rosenstiel
by Jon Rosenstiel
Wed Oct 30, 2019 6:46 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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...
by Jon Rosenstiel
Tue Oct 29, 2019 10:47 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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...
by Jon Rosenstiel
Mon Oct 28, 2019 11:13 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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
by Jon Rosenstiel
Mon Oct 28, 2019 6:09 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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
by Jon Rosenstiel
Sun Oct 27, 2019 11:58 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

Titanium cathode testing. One of titanium's downsides is outgassing when it becomes red-hot.
Ti cathode_640_jpg.jpg
Ti cathode_640_jpg.jpg (39.36 KiB) Viewed 489 times
Jon Rosenstiel
by Jon Rosenstiel
Sat Oct 12, 2019 5:28 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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
by Jon Rosenstiel
Fri Oct 11, 2019 10:36 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2722

Re: Cube fusor build

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’...
by Jon Rosenstiel
Tue Oct 08, 2019 10:43 pm
Forum: Images du Jour
Topic: HEAS 2019 photos of the event
Replies: 19
Views: 1677

Re: HEAS 2019 photos of the event

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

Jon Rosenstiel