Fusor Forums

Fixed the missing file, should work now.

JonR

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

Jon R

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

Jon Rosenstiel

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...

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

Looks really good Mark, I’m impressed.

JonR

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 ...

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

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...

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...