Search found 1220 matches

by Frank Sanns
Wed Jan 21, 2004 3:38 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: AC High voltage Fusor Power Supply?
Replies: 10
Views: 3954

Re: AC High voltage Fusor Power Supply?

<t>Thanks Dave. I rechecked my math and found that I just wrote done the wrong exponent on the transit time. The final frequency is indeed correct at 11.9 MHz. It is fixed in the post.<br/> <br/> Also check out the post Re: The "runaway reaction" and my thoughts on the subject. from July 2003. More ...
by Frank Sanns
Wed Jan 21, 2004 5:11 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: AC High voltage Fusor Power Supply?
Replies: 10
Views: 3954

Re: AC High voltage Fusor Power Supply?

<t>The resonant frequency is the frequency that the ions (ie deuterons) are oscillating in step, in and out of the inner grid. For the sake of simplicity for this particular post I will not go too much into the details but rather just show the calculation for one condition as several fusor parameter...
by Frank Sanns
Wed Jan 21, 2004 1:04 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: AC High voltage Fusor Power Supply?
Replies: 10
Views: 3954

Re: AC High voltage Fusor Power Supply?

<t>Hi Tom. <br/> <br/> Check out the Images Section for the amplifier that I use for supplying RF to the fusor. Many people talk about microwaves for ionization but for resonance of the deuterons in the fusor, the frequency is between 10 MHz and 14 Mhz. <br/> <br/> As soon as I get some good 1 inch ...
by Frank Sanns
Wed Jan 14, 2004 2:01 am
Forum: Interesting Links
Topic: Historical Nuclear Equipment Museum
Replies: 2
Views: 1676

Re: Historical Nuclear Equipment Museum

<t>Read Carl's review. The book looks good. May have to add it to my wish list. <br/> <br/> I am still amazed at how many consumer products still have radioactive materials in them. Even half of the lantern mantels sold today still have thorium in them. When I was younger I always wondered why they ...
by Frank Sanns
Wed Jan 14, 2004 1:44 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Spot welding Tungsten
Replies: 7
Views: 3465

Re: Spot welding Tungsten

Great looking weld Phil. No partial fuse there. My welds tend to be dry or burned through. Based on what you and Richard said, it looks like I need to work on my technique with stainless then do it with Tantalum.

Frank
by Frank Sanns
Mon Jan 12, 2004 8:37 pm
Forum: Interesting Links
Topic: Historical Nuclear Equipment Museum
Replies: 2
Views: 1676

Historical Nuclear Equipment Museum

<r>Some cool equipment from the dawn of the nuclear age. <br/> <br/> Check out the Barrier Shielding Demonstrator.<br/> <br/> Or you could opt for a radium bath and "remain in bath for 45 minutes .......then relax in bed for one hour". Sheesh, why not just lie down in your coffin and save time????<b...
by Frank Sanns
Mon Jan 12, 2004 4:41 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Spot welding Tungsten
Replies: 7
Views: 3465

Re: Spot welding Tungsten

<t>Nice to see you back here Phil! <br/> <br/> Yes, for inner grids. I started with 3+in diameter bolt together grids then went to silver solder but neither held up very well. All of the rest have been with stainless steel that has been spot welded but my welds often fail. Most likely becasue of my ...
by Frank Sanns
Sun Jan 11, 2004 5:54 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Fusor X-ray Spectra
Replies: 17
Views: 5149

Re: Fusor X-ray Spectra

<t>Nice work Jon. The "afterglow" that you are seeing may be due to x-ray activation of the NaI. <br/> <br/> To analyse a sample by x-ray diffraction, you grind it up with potassium iodide or chloride then put it into the x-ray beam. You start with a pure white powder but when you open up to remove ...
by Frank Sanns
Sun Jan 11, 2004 3:02 am
Forum: Images du Jour
Topic: Archived - Frank Sanns. Air Plasma and Fusion Stars
Replies: 0
Views: 3257

Archived - Frank Sanns. Air Plasma and Fusion Stars

<t>First picture: Air plasma. Outer grid is 10" diameter lattice grid and inner is 3.5 inch diameter lattice grid. <br/> <br/> Second picture: 3.5" lattice grid running higher power (800 watts). Only a faint diffuse star can be seen.<br/> <br/> Third picture: 1.75" inner grid. Star is still difuse b...
by Frank Sanns
Sat Jan 10, 2004 7:19 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Spot welding Tungsten
Replies: 7
Views: 3465

Spot welding Tungsten

<t>Does anybody have any experience spot welding tungsten? Is there a flux that is used or an inert atmosphere needed. <br/> <br/> I have not been sucessful in spot welding with my (60 J) yag laser. I can easily punch through a 1/16" of tungsten but when I back down the laser power it just doesn't s...