Search found 651 matches

by Andrew Seltzman
Wed Jun 09, 2004 4:37 am
Forum: Vacuum Technology (& FAQs)
Topic: Plasma "Pump"
Replies: 15
Views: 4117

Re: Plasma "Pump"

On the vacuum side, what if you were to direct an ion beam emanating from the central grid into the vacuum port of your chamber. That probably would increase vacuum.

Andrew Seltzman
www.rtftechnologies.org
by Andrew Seltzman
Sun Jun 06, 2004 1:05 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Photoelectric grid emission
Replies: 2
Views: 1528

Photoelectric grid emission

<r>I have observed that when running in glow mode, plasma containment will decrease and the poisser will become diffuse when the cathode grid heats up. This is probably due to excessive thermionic emission from the grid. On a deuterium fusor the plasma will emit a large amount of photons in the uv s...
by Andrew Seltzman
Tue May 11, 2004 11:51 pm
Forum: Images du Jour
Topic: Archived - Fusor test pictures
Replies: 5
Views: 5434

Re: Fusor test pictures - update

<r>The spiral grid was 0.75” in diameter, vacuum: 50 mTorr, -6kv.<br/> When run the spiral grid (1/8” OD copper tube) heated up until it was red and then melted. When it was cool the poisser was well defined.<br/> <br/> The spherical grid is 1” in diameter, vacuum: 25-30 mTorr, -3.5kv.<br/> The sphe...
by Andrew Seltzman
Tue May 11, 2004 6:46 pm
Forum: Images du Jour
Topic: Archived - Fusor test pictures
Replies: 5
Views: 5434

Archived - Fusor test pictures - update

<r>Here are the latest pictures from my fusor runs; the best vacuum so far is about 30 microns. The heavy copper spiral grid worked well at -6kv, however it melted shortly due to copper’s lower melting point. A new spiral grid is in construction.<br/> <br/> Andrew Seltzman<br/> <URL url="http://www....
by Andrew Seltzman
Tue May 04, 2004 5:15 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Oil question
Replies: 10
Views: 2973

Re: Oil question

<r>For insulating hv, I would recommend castor oil. You can get it at ace hardware under the name “Scoot Mole” mole repellent; you get 1.9L (64 fl oz) for about $20. I have successfully insulated a HV multiplier and have heard of its uses on tesla coil capacitors.<br/> <br/> <br/> Andrew Seltzman<br...
by Andrew Seltzman
Tue Apr 27, 2004 3:34 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Large Inner Grid
Replies: 35
Views: 7095

Re: Large Inner Grid

<r>I have seen this effect also. I am running a 3” outer, 1” inner grid ratio at 35 microns and can get up to 3kv with out grid heating. With these conditions the poisser is about 0.5” in diameter and 3 ion beams escape the grid. During sustained operation my meter increases to about 50 microns. If ...
by Andrew Seltzman
Sat Apr 24, 2004 5:28 pm
Forum: Interesting Links
Topic: MultiMegaWatt RF driver
Replies: 5
Views: 2255

Re: MultiMegaWatt RF driver

<r>Could the IGBT be replaced with a SCR, I have seen several applications of SCRs in generating extremely high magnetic fields on the amateur level, as high as 78000 Gauss. SCRs also usually have the advantage of being able to pulse currents considerably higher then their continuous rating, sometim...
by Andrew Seltzman
Sat Apr 17, 2004 4:37 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Deuterium Oxide Handling
Replies: 6
Views: 2336

Re: Deuterium Oxide Handling

<r>There are two main ways to extract the deuterium from the heavy water, oxidation of a reactive metal, or electrolysis. <br/> <br/> In Craig Wallace’s system he had a heated column of magnesium shavings. The column is connected to the vacuum system. A closed cylinder of heavy water is connected to...
by Andrew Seltzman
Sat Apr 17, 2004 4:18 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Hollow cathode lamp ion gun
Replies: 6
Views: 7247

Hollow cathode lamp ion gun

<r>Here is a suggestion for an ion gun that I think might be simple and inexpensive to build. The design is based on the utilization of a hollow cathode lamp (about 2” od) as the ion source and body for the gun assembly. The cathode / anode of the lamp (some lamps actually have anodes that are rings...
by Andrew Seltzman
Sun Mar 28, 2004 11:17 pm
Forum: Images du Jour
Topic: Archived - Fusor test pictures
Replies: 5
Views: 5434

Re: Fusor test pictures

Here is the entire assembly

Andrew Seltzman
http://www.rtftechnologies.org