Search found 1247 matches

by Jon Rosenstiel
Mon Oct 19, 2020 6:58 pm
Forum: Files
Topic: Photodiode Pulser Circuit
Replies: 3
Views: 5048

Re: Photodiode Pulser Circuit

Fixed the missing file, should work now.

JonR
by Jon Rosenstiel
Sat Oct 17, 2020 8:10 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Roll your own preamp (Richard Hester design)
Replies: 13
Views: 649

Re: FAQ - Roll your own preamp (Richard Hester design)

Glad I could help out. I’m going to attempt to restore all of Richard Hester’s missing images/schematics/files.

Jon R
by Jon Rosenstiel
Sat Oct 17, 2020 5:45 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Roll your own preamp (Richard Hester design)
Replies: 13
Views: 649

Re: FAQ - Roll your own preamp (Richard Hester design)

Missing images in Richard Hester thread have been restored. (Also restored schematic for the "Pathetically Simple Charge Sensitive Amplifier")

Jon Rosenstiel
by Jon Rosenstiel
Sat Sep 26, 2020 4:25 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: NEW Fusor V build under way.
Replies: 62
Views: 6267

Re: NEW Fusor V build under way.

I've found that 1 to 1.75-inches of HPDE moderator works well for silver activation. (Reflector thickness of 4") I think on paper 1" would not be enough, but I suspect the increased neutron flux more than makes up for it. (Inverse square law) Edit: And we also need to take into account silver's larg...
by Jon Rosenstiel
Fri Aug 28, 2020 8:36 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 22
Views: 3128

Re: Fusor 2020 Activation Experiments

Mark,

As to your copper count conundrum, maybe try copper metal powder in a Marinelli beaker. I think they run somewhere around $15.00 each.

https://www.drct.com/dss/accessories/be ... eakers.htm.

Jon R
by Jon Rosenstiel
Mon Aug 17, 2020 5:24 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020
Replies: 22
Views: 2660

Re: Fusor 2020

Looks really good Mark, I’m impressed.

JonR
by Jon Rosenstiel
Fri Aug 14, 2020 5:06 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Effect of lead and HDPE on fast neutron flux
Replies: 3
Views: 518

Re: Effect of lead and HDPE on fast neutron flux

Richard, Yeah, I was reading about your experience with the 5/8" lead shielding and figured this would be a good time to put this up on the forum. As we know, the BC-720 is pretty-much worthless for the beginner trying to see if his (or her) brand new fusor is producing neutrons, just not sensitive ...
by Jon Rosenstiel
Thu Aug 13, 2020 7:50 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Water Cooling the Cube Fusor
Replies: 5
Views: 613

Re: Water Cooling the Cube Fusor

Thanks Dennis, and you’re welcome Mark. And yes, practice is a really good idea. I did three practice runs before attempting the real deal.

JonR
by Jon Rosenstiel
Thu Aug 13, 2020 6:37 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Effect of lead and HDPE on fast neutron flux
Replies: 3
Views: 518

Effect of lead and HDPE on fast neutron flux

A quick test to see the effect of lead and HDPE on the fusor’s fast neutron flux. Detector element is a 2” diameter by 5/8” thick BC-720 replica fast neutron detector. Note that these types of detectors are insensitive to fast neutrons below 1 MeV. Flux with no absorber: 20.4 cps Flux with 2” of lea...
by Jon Rosenstiel
Thu Aug 13, 2020 6:01 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Water Cooling the Cube Fusor
Replies: 5
Views: 613

Water Cooling the Cube Fusor

I tried forced air cooling and it did help to stabilize neutron output, but it was not stable enough for what I wanted to do. What follows is a brief report on my water-cooling journey. First order of business was to fill the original threaded mounting holes in the bottom of the cube with aluminum e...