Search found 1521 matches

by Dennis P Brown
Wed Oct 17, 2018 12:46 pm
Forum: The Trading Post
Topic: [Requist] Looking for vacuum equipment (NL)
Replies: 5
Views: 271

Re: [Requist] Looking for vacuum equipment (NL)

A few words: first, shipping deuterium gas is a nightmare - period. It requires very special hazard/explosive controls and that cost makes shipping a pump overseas look small in comparison. Rather, you will want heavy water (D2O) and use a electrolysis to convert into gas. A number of people here ha...
by Dennis P Brown
Mon Oct 15, 2018 2:23 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Jan Ruge Fusion Attempt @ Chaos Darmstadt
Replies: 13
Views: 1714

Re: Jan Ruge Fusion Attempt @ Chaos Darmstadt

It is rather important that you do "suppress" electrons from off the target using reverse biasing (this can be a challenge with your high voltage target - that is why I "grounded" my target relative to the gun so biasing was easy*.) The potential x-ray flux can be quit dangerous (electron's tend to ...
by Dennis P Brown
Thu Oct 11, 2018 11:21 am
Forum: Images du Jour
Topic: Archived - Tom McCarthy's Fusor Efforts
Replies: 21
Views: 7050

Re: Archived - Tom McCarthy's Fusor Efforts

The plasma color looks correct. If your pressure is dropping too low and your plasma going out, then certainly you need to "throttle" your turbo more via the gate valve since your pump rate is far too fast. For my system, I'd pump it down, adjust the gate valve almost closed, add deuterium to create...
by Dennis P Brown
Thu Oct 11, 2018 10:14 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Jan Ruge Fusion Attempt @ Chaos Darmstadt
Replies: 13
Views: 1714

Re: Jan Ruge Fusion Attempt @ Chaos Darmstadt

I too went this route, at first. I too learned a great deal. I even built a 100 kV voltage supply, and achieved the low 10^-6 torr, and built the ion accelerator with gun (I built various van de graaf'fs, all to no avail. Talk about a waste of time - lol.) I stopped when I realized that the voltage ...
by Dennis P Brown
Sat Oct 06, 2018 10:06 pm
Forum: Announcements and Site Administration Topics
Topic: Frank Sanns in the hospital!
Replies: 4
Views: 361

Re: Frank Sanns in the hospital!

Wish him a speedy recovery!
by Dennis P Brown
Tue Oct 02, 2018 10:33 am
Forum: Advanced Technical Discussion Area
Topic: Palladium and Fusion
Replies: 9
Views: 2539

Re: Palladium and Fusion

Another possible explanation and one I'd think is more likely is that the diffusion rate into Pd is too fast for surface 'bonded' deuterium. All the fusion of deuterium via a fusor 'wall effect' is most likely occurring on the utmost surface where the energetic ions from the plasma can collide with ...
by Dennis P Brown
Thu Sep 27, 2018 10:33 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: What vacuum chamber do I use?
Replies: 10
Views: 471

Re: What vacuum chamber do I use?

For a four-way cross, really no need for welding. Drilling, maybe. But simple KF fittings for the covers and using covers that have pre-made window/connectors make the job rather easy. The issue is finding the right pieces at the right price on ebay - patience is the key.
by Dennis P Brown
Thu Sep 27, 2018 9:28 am
Forum: New User Chat Area
Topic: Budget and Insulator Questions
Replies: 7
Views: 633

Re: Budget and Insulator Questions

All the above posts are excellent advice; however, a better approach is to use a four way cross vacuum connection rather than a three way. In this manner, you can more easily upgrade to a real fusor later if the extra equipment becomes available. Also, consider that instead of building a demo fusor,...
by Dennis P Brown
Thu Sep 27, 2018 9:19 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: What vacuum chamber do I use?
Replies: 10
Views: 471

Re: What vacuum chamber do I use?

The major advantage with a four way cross is that for a given voltage (as little as 25 kV and around 20 ma) one can obtain an easy to detect neutron signal. These small "chambers" work at significantly higher pressure, and are very easy to assemble. Having the four "ports" allows all essential conne...