Search found 1215 matches

by Jon Rosenstiel
Fri Jan 17, 2020 6:18 pm
Forum: Images du Jour
Topic: Visit to Jon Rosenstiel's
Replies: 7
Views: 535

Re: Visit to Jon Rosenstiel's

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...
by Jon Rosenstiel
Tue Jan 14, 2020 1:39 am
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 26
Views: 1532

Re: Jim Kovalchick -My attempt at smaller fusor

Jim,

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

Jon R
by Jon Rosenstiel
Fri Jan 10, 2020 5:07 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: TA DA New Use of Plasmas
Replies: 10
Views: 672

Re: TA DA New Use of Plasmas

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

Jon Rosenstiel
by Jon Rosenstiel
Thu Jan 09, 2020 6:45 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Magnetically assisted ionization
Replies: 8
Views: 431

Re: Magnetically assisted ionization

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...
by Jon Rosenstiel
Tue Jan 07, 2020 4:20 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 32
Views: 3626

Re: Cube fusor build

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...
by Jon Rosenstiel
Fri Jan 03, 2020 10:59 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 32
Views: 3626

Re: Cube fusor build

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...
by Jon Rosenstiel
Fri Jan 03, 2020 10:03 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 26
Views: 1532

Re: Jim Kovalchick -My attempt at smaller fusor

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
by Jon Rosenstiel
Fri Jan 03, 2020 7:26 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 26
Views: 1532

Re: Jim Kovalchick -My attempt at smaller fusor

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...
by Jon Rosenstiel
Wed Jan 01, 2020 5:32 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: The Jon Rosenstiel Grid
Replies: 5
Views: 286

Re: The Jon Rosenstiel Grid

Alan,

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

Jon Rosenstiel
by Jon Rosenstiel
Wed Jan 01, 2020 1:05 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: The Jon Rosenstiel Grid
Replies: 5
Views: 286

Re: The Jon Rosenstiel Grid

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