Fusor Forums

One day it’s a fusor, the next a pumping station. On the pumps (Leybold D16A backing and Pfeiffer TPH-190 turbo) is my Ortec hpGe detector getting its annual bump and bake. Wrapped up in foil is an aluminum rod in contact with the detector’s cooling rod. Heat tape wrapped around the upper portion of...

Jim,

As to outgassing, was your titanium cathode pure Ti or an alloy? (The one I made was an alloy, 6Al-4V)

Jon R

Only a 30-foot range? Guess I’ll need to buy two or three for the house plus another for my lab!

Jon Rosenstiel

From my understanding the main purpose of the magnets was to help stability, I don't recall Joe saying anything (good or bad) about their effect on NPR. (Neutron Production Rate) My main interest is activation so maximum neutron flux at the sample is what I'm after. Stability was not an issue for me...

Frank, great idea that may help us get to the bottom of this conundrum, much appreciated. I’ve worked on this just enough to realize that the detector clamped in a lab stand is not going to cut it, takes too long to reposition the detector and is not very accurate. I’m in the process of upgrading my...

304 SS cathode images. Removed after about two weeks of runtime, the majority of that time at 400 W input power. (40 kV, 10 mA, 2.4E+06 n/s) There are two things I find interesting, the narrow ring around the cathode's internal circumference and the whiskers it grew. My guess is the ring is where t...

Jim,

It'll be interesting to see what the neutron numbers do with increased runtime. With my cube the neutron numbers changed very little (if any) with increased runtime.

Jon

Nice going Jim, and congrats on first neutrons. The cube's pressure while running at 30 kV, 10 mA is around 27 mTorr... quite similar to your setup. And I noticed that the plasma beam coming from the left-hand end of your cathode looks a little thready, may be due to not having the cathode perfectly...

Alan,

A search for: “Tungsten cathode, no welding required” will find the now repaired post.

Jon Rosenstiel

Alan,

For the past couple of days I’ve been working on fixing the missing images but don’t recall if I’ve fixed the one(s) you’re looking for. I should have all of my missing images fixed in another day or two.

Jon Rosenstiel