Search found 84 matches

by Finn Hammer
Tue Mar 02, 2021 8:30 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Software to collect and display measured data.
Replies: 4
Views: 64

Software to collect and display measured data.

I am slowly approaching the day, when I can start up the Pfeiffer THM 071P on a tee, and test my vacuum gauges. I have 2 Baratrons @ 50 Torr, one 999 Quattro and four 901P's and I am going to test them 2 at a time to see how well they track each other, and therefore perhaps can be assumed to be accu...
by Finn Hammer
Tue Mar 02, 2021 9:43 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 14
Views: 1166

Re: One more cube fusor

A litle update on the Steampunk Dragon. Some brass and alluminum discs arrived: rawmaterial.jpg These materials were run across the lathe, soldered and cleaned up. Endplugs in particular need more polishing. turnedout.JPG This manifold is a bit complicated to make, and I have full understanding if a...
by Finn Hammer
Thu Feb 18, 2021 10:49 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: A 50kV supply with 33mA drive ability
Replies: 19
Views: 2513

Re: A 50kV supply with 33mA drive ability

Joe,

Open loop, I'm afraid.
For one, I fear that the plasma would react faster than any feedback system, and could lead to oscillations.
Another reason is that I am not so good with bode plots and phase shift.

Cheers, Finn Hammer
by Finn Hammer
Thu Feb 18, 2021 9:45 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 14
Views: 1166

Re: One more cube fusor

A bit more work on the cube. The inside of it was given the fillets, and the polish, quite a wavy surface despite the shine. IMG_20210212_200052.jpg I decided to put helicoil in the mounting holes, since the thing probably has to come apart again and over. IMG_20210213_143530.jpg I spent a lot of ti...
by Finn Hammer
Thu Feb 11, 2021 5:09 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 14
Views: 1166

Re: One more cube fusor

Mark, I know nothing about plasma in a vacuum, but a bit about breakdown in atmospheric pressure. I assume that the same rules apply with regard to field control.Therefore, the plugs in the squirrel cage grid version, I drew them that way, because I wanted the cylindrical grid axially aligned in an ...
by Finn Hammer
Sun Feb 07, 2021 1:07 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 63
Views: 14781

Re: Cube fusor build

Jon, all As you will see in another post, your cube fusor has my full attention, and I have been puzzeled by this picture for a while: https://fusor.net/board/download/file.php?id=17177&mode=view My focus is on the coloring on the outside surface. There is a blue band at each end, and in the middle,...
by Finn Hammer
Sun Feb 07, 2021 1:07 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 14
Views: 1166

One more cube fusor

I am trying to design my fusor. And boy, do I wish that Joe Gayo lab tour would become accessible somehow. It may be remembered that I welded this monstrosity a couple of years ago: IMG_20210207_120945.jpg That stainless ball is destined into the future, and that may well be the landfill, I'm not su...
by Finn Hammer
Sat Jan 30, 2021 3:47 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Extremally cheap HV feed through (if you have a lathe in hand)
Replies: 18
Views: 1541

Re: Extremally cheap HV feed through (if you have a lathe in hand)

Maciek, A google search for "picein wax" does suggest many interesting waxes and their uses, but hardly anything like what you are showing, Is the piecin wax indeed this product from Apiezon, "Wax W" ? https://www.idealvac.com/Apiezon-Wax-W-Hard-Vacuum-Sealing/pp/P104530 It looks like it could be so...
by Finn Hammer
Sat Jan 23, 2021 11:38 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: A 50kV supply with 33mA drive ability
Replies: 19
Views: 2513

Re: A 50kV supply with 33mA drive ability

Frank, Thanks for the tip. So you have a basketwinder too? Which brand is it? I have used CA glue for the same purpose and I gather there is even prefabricated wire with a coating which can be made sticky, by passing it through a bath with solvent, but up to now, have not managed to procure any of i...
by Finn Hammer
Tue Jan 19, 2021 4:07 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: A 50kV supply with 33mA drive ability
Replies: 19
Views: 2513

Re: A 50kV supply with 33mA drive ability

Victor, You are right, basket coil winding is a lost art, and a complete separate project. I bought a MoReCo winder on EBay, and it is a piece of junk, really, but if you nurse it a bit, it can be brought to work. There is a lot of unwanted slack in it though. It looks like this: IMG_20210119_145318...