Search found 437 matches

by Tyler Christensen
Sun Apr 08, 2018 4:08 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 40
Views: 14066

Re: F.I.C.S Fusion Runs

A fusor running on the order of a million neutrons per second puts out microwatts of power in radiation form. At 60kV output voltage, this would be picoamps-nanoamps of current gained by the fusion, even if 100% of the fusion energy were magically turned into electrical potential. You're measuring m...
by Tyler Christensen
Thu Jul 31, 2014 1:25 am
Forum: Images du Jour
Topic: Archived - Neutron from Thailand~!!!
Replies: 14
Views: 4767

Re: Neutron from Thailand~!!!

I've always calibrated those GE tubes by placing ore next to it, turn the bias up until it detects the ore (confirm it's the ore by then removing it and checking that the count rate drops again). Then, turn it down 50V and it's a great neutron detector. Certainly still have to do moderator checks to...
by Tyler Christensen
Tue Mar 12, 2013 12:40 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Diode Testing Question
Replies: 10
Views: 5432

Re: High Voltage Diode Testing Question

<t>Those caps are definitely not 4700uF. Based on the size and marking, quite likely 4700pF (a million times less than 4700uF).<br/> <br/> This is a good thing, because at 4700uF it would hold 1.8MJ (which is a way you can know it's not 4700uF). Instead, it's about 1.8J. Unlikely to do anything more...
by Tyler Christensen
Mon Mar 04, 2013 11:54 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Ground Loops and other High Voltage Issues
Replies: 7
Views: 2382

Re: Ground Loops and other High Voltage Issues

<t>There isn't enough information here for a full diagnosis, but what happened shouldn't have happened if everything is assembled properly. Something is very dangerously wrong with your setup. The fact that a grounded chassis was at a high potential implies, quite simply, that it's not actually grou...
by Tyler Christensen
Tue Feb 26, 2013 3:09 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: The long awaited 1.33" Fusor construction write up.
Replies: 14
Views: 5844

Re: The long awaited 1.33" Fusor construction write up.

You should get a high voltage probe. They plug into a typical meter and generally divide by 100 and operate up to tens of kilovolts. You can get them on ebay for a pretty low cost usually.
by Tyler Christensen
Tue Feb 26, 2013 3:05 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: The long awaited 1.33" Fusor construction write up.
Replies: 14
Views: 5844

Re: The long awaited 1.33" Fusor construction write up.

Why do you think it held up to 15kv? An NST is ballasted, and when sustaining a typical fusor plasma, could drop to even less than 1kv.
by Tyler Christensen
Tue Feb 26, 2013 12:44 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: The long awaited 1.33" Fusor construction write up.
Replies: 14
Views: 5844

Re: The long awaited 1.33" Fusor construction write up.

<t>Looks like nice hardware.<br/> <br/> You put 50kv on that feedthrough? If you did, I'd love to know what potting compound you submerged it in so I can pot everything I ever make in it. Otherwise, I can effectively guarantee you're not close to 50kv. I'd seriously question even 10kv being on that ...
by Tyler Christensen
Mon Feb 25, 2013 1:37 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Grid Shielding - Testing with Results
Replies: 13
Views: 6608

Re: Grid Shielding - Testing with Results

<t>Not the temperature affecting current. My thought is what if the shields or magnets affect the current draw (which it probably does). I don't have time to read through the paper right now, but it looks like you concluded your ideas failed to improve confinement because the grid got hotter even fa...
by Tyler Christensen
Sun Feb 24, 2013 5:38 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Grid Shielding - Testing with Results
Replies: 13
Views: 6608

Re: Grid Shielding - Testing with Results

Was cathode current relatively unaffected between control and test? If it was affected, since you were running constant-voltage it sounds like, you might want to normalize the times to wattage. I wonder if that would change the outcome.
by Tyler Christensen
Fri Feb 15, 2013 9:31 pm
Forum: Vacuum Technology (& FAQs)
Topic: NPT Valves in High Vacuum Range
Replies: 8
Views: 4085

Re: NPT Valves in High Vacuum Range

<t>Air shouldn't leak if you properly use teflon tape. If you don't or improperly use it, then yes air will leak through the threads. It's unlikely you'll ever get a UHV seal with NPT fittings and teflon tape, but for fusors you can do fine. I made extensive use of NPT in my fusor.<br/> <br/> Tyler<...