Search found 2329 matches

by Carl Willis
Fri Sep 20, 2013 8:53 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Polywell Site
Replies: 6
Views: 3207

Re: Polywell Site

The Polywell has been perennially appealing to armchair-class enthusiasts, much less appealing to the kind of people who like to actually build things (with the unique exception of Mark Suppes). The publicly-available background info on the Polywell remains too weak to give credence to the claims lo...
by Carl Willis
Wed Sep 11, 2013 8:38 am
Forum: Vacuum Technology (& FAQs)
Topic: Hydrogen leak detection
Replies: 14
Views: 4570

Re: Hydrogen leak detection

Hi Ross, Helium leak detection is the standard, and most sensitive, method used with vacuum systems. One of the advantages of buying commercial vacuum components is that all welds have been helium leak-checked. Any machine shop that specializes in vacuum technology will have a helium leak detector a...
by Carl Willis
Tue Sep 10, 2013 6:31 am
Forum: Vacuum Technology (& FAQs)
Topic: Hydrogen leak detection
Replies: 14
Views: 4570

Re: Hydrogen leak detection

Hydrogen is a major component of the residual gases in technical vacuum work, so wouldn't be high on the list as a leak detection tracer for vacuum systems. At the gross leak level, however, almost any common gas can be used as a leak tracer with an appropriate detector.

-Carl
by Carl Willis
Sun Sep 08, 2013 6:09 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Plasma Diagnostics And Science Fair
Replies: 16
Views: 5199

Re: Plasma Diagnostics And Science Fair

Hi Tom, This is where your own imagination and interest really have to take the reins. There are no science fairs an open-source community can win. These competitions are for individuals. Above all, my advice toward a high score is to keep your focus ridiculously simple and measurement-driven. Scori...
by Carl Willis
Thu Sep 05, 2013 9:58 pm
Forum: Vacuum Technology (& FAQs)
Topic: AC Window Unit Compressors
Replies: 25
Views: 7621

Re: AC Window Unit Compressors

The tradeoffs between time and money, between learning the hard way and getting to a destination promptly, are all personal matters. That said, the economic argument for home-rolled diff pumps and refrigerator compressor vacuum systems has scant credibility. Today's conversation sounds just like Mik...
by Carl Willis
Wed Sep 04, 2013 12:48 am
Forum: Vacuum Technology (& FAQs)
Topic: Diff pump first looks
Replies: 7
Views: 2221

Re: Diff pump first looks

I will be at HEAS. Indeed I am a Burqueño at the moment and plan on sticking around. UNM has an interesting NE program, complete with the unique little 6-watt plastic nuclear reactor. Did you get to operate it at all? I work and live about a mile from main campus. If you come back this way, I have a...
by Carl Willis
Tue Sep 03, 2013 10:52 pm
Forum: Vacuum Technology (& FAQs)
Topic: Diff pump first looks
Replies: 7
Views: 2221

Re: Diff pump first looks

Hi Andrew,

The Brillo is intentional (it provides surface on which to nucleate evaporation of oil).

-Carl
by Carl Willis
Tue Sep 03, 2013 5:26 pm
Forum: Vacuum Technology (& FAQs)
Topic: Could you help me judge this vacuum pump?
Replies: 19
Views: 6550

Re: Could you help me judge this vacuum pump?

Does anybody know if it's possible to use a Variac as adapter to provide 120v to items from a 220v mains? In this case--a diffusion pump heater--a cheap light dimmer can be used to control power consumption. Even in cases where the nominal heater voltage rating and the mains supply are consistent, ...
by Carl Willis
Sat Aug 31, 2013 7:52 pm
Forum: Vacuum Technology (& FAQs)
Topic: Could you help me judge this vacuum pump?
Replies: 19
Views: 6550

Re: Could you help me judge this vacuum pump?

Martin, There is little brand variation among diffusion pumps, outside of appearance. My advice is to pick something small. You will have to buy oil for the pump, and it is very expensive, so it pays to stay on the small size. Fusor projects almost never benefit from the high speed of a big pump any...
by Carl Willis
Sat Aug 31, 2013 7:06 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Fusor Computer Modeling
Replies: 32
Views: 13173

Re: Fusor Computer Modeling

some basic modeling for fusor design
What do you mean by this? If you can communicate clearly what you want out of this "basic modeling," then it will be infinitely easier for people in the community to point you in a viable direction (or tell you what the challenges are).

-Carl