Search found 1236 matches

by Jon Rosenstiel
Thu Aug 06, 2020 4:26 am
Forum: Images du Jour
Topic: Multi Cylinder Cathode Fusor
Replies: 5
Views: 284

Re: Multi Cylinder Cathode Fusor

Should be interesting... and exciting too. Good on ya, Frank.

JonR
by Jon Rosenstiel
Sun Aug 02, 2020 2:04 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8434

Re: Cube fusor build

Except for the detector’s thickness (it’s 5/8” thick) you’ve got it right, Richard.

JonR
by Jon Rosenstiel
Sat Aug 01, 2020 10:25 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8434

Re: Cube fusor build

Detector position for the 90-degree data in an earlier post was in-line with the neutron formation area (0.75” off center) not the cube's centerline. Below find close-up 0-degree/90-degree data taken with the detector on the cube's centerline at both 0-degrees and 90-degrees. data_1.jpg Each distanc...
by Jon Rosenstiel
Sat Aug 01, 2020 10:04 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8434

Re: Cube fusor build

Frank,
I sat on that graph for quite a while because something didn't seem quite right about it, but I never could put my finger on what it was.

Here is a similar chart from the attached paper.
Screenshot 2019-12-19 15.24.59.png
DD Anisotropic neutron emission.pdf
(1.99 MiB) Downloaded 8 times
JonR
by Jon Rosenstiel
Fri Jul 31, 2020 9:10 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8434

Re: Cube fusor build

Joe, I don't know if you consider 20-inches a "much greater distance", but that's the limit of my setup.

Ratio of 0-degree to 90-degree count-rates at different distances.
At 3.5-inches = 3.0:1
At 10-inches = 2.0:1
At 20-inches = 1.7:1

Jon Rosenstiel
by Jon Rosenstiel
Fri Jul 31, 2020 4:56 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8434

Re: Cube fusor build

Wow, very interesting hypothesis Frank, and great analogy, think laser without the mirrors. I had a great time doing the experiment. And that BC-720 replica I made nearly twenty years ago finally found a purpose.

JonR
by Jon Rosenstiel
Thu Jul 30, 2020 9:53 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Activation measurement technique
Replies: 47
Views: 13592

Re: Activation measurement technique

Glad to be of help.

Just now fixed the missing txt file, managed to copy its contents into a word document.

JonR
by Jon Rosenstiel
Thu Jul 30, 2020 9:36 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8434

Re: Cube fusor build

Sorry for the long delay Frank. Feedthrough puncture issues, other projects, a water-cooling mod and on and on. All data runs were done at 8 mA, 44 kV, ~23.5 mTorr. Two detectors were used, a moveable fast neutron detector (2” BC-720 replica coupled to a pmt) and a stationary 1”x 22” He3 tube in a p...
by Jon Rosenstiel
Thu Jul 30, 2020 8:04 pm
Forum: Images du Jour
Topic: Fusor 2020 Star Mode
Replies: 2
Views: 172

Re: Fusor 2020 Star Mode

Beautiful star, Mark. If you positioned a bubble detector in line with one of the star’s rays I suspect you’d see more bubbles than when placed between the rays.

JonR
by Jon Rosenstiel
Thu Jul 30, 2020 3:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Activation measurement technique
Replies: 47
Views: 13592

Re: Activation measurement technique

I believe I've got everything fixed... except for the txt file.

JonR