Search found 1625 matches

by Dennis P Brown
Tue Jan 22, 2019 1:20 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 16
Views: 617

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Very nice results; Bubble detectors are useful and the gold standard. I too checked mine with a 22 bubbles/rem - turns out my neutron detector wasn't too far off (around 170 k neutrons/sec.) I did two chamber sizes with two bubble measurements to show that halving the fusor volume nearly doubled the...
by Dennis P Brown
Mon Jan 21, 2019 9:32 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Institutional Quackery
Replies: 6
Views: 236

Re: Institutional Quackery

A few important issues: The author states: "A basic calculation will show that the fusion triple product has a value of approximately 1.5 × 1019 s · m−3 · keV." Without giving the volume that this 'density/energy' value was determined for, this is an extremely mis-leading statement. In fact, without...
by Dennis P Brown
Mon Jan 21, 2019 9:26 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 21
Views: 571

Re: Construction of Neutron Grade Fusor

Don't get discouraged. You are making excellent progress - like getting the plasma under better control. Your voltage (28 kV) is a bit low if your supply is producing under 8 ma; yes, you'll get neutrons but fewer than you might want or need. Obviously, you need to be safe but kicking the voltage up...
by Dennis P Brown
Mon Jan 21, 2019 9:15 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 18
Views: 537

Re: 50kV Supply

Oops; you are both correct. I should have typed 2000 pF. Thanks for catching the mistake!
by Dennis P Brown
Sun Jan 20, 2019 6:19 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 18
Views: 537

Re: 50kV Supply

Interesting pictures. Those are tiny caps compared to my 8 stage unit (20 kV/0.1pF door knob caps and 100 ma diodes.) I just used a 1500 volt, 60 Hz MOT so, certainly not in the class of continuous power like those units with their very high driver frequency but certainly my unit was a dangerous bea...
by Dennis P Brown
Fri Jan 18, 2019 1:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 26
Views: 2740

Re: My progress II

Glad to hear about the lead shielding. There is no real need to concern yourself with neutron shielding. Maybe in the future but most fusors produce very safe levels of neutrons - even ones that can activate silver. As some here know, I am not a fan of water shielding around high voltage (but that i...
by Dennis P Brown
Fri Jan 18, 2019 1:28 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 21
Views: 571

Re: Construction of Neutron Grade Fusor

The 13-14 kV and a maximum of just 8 ma is not a voltage/power that generally yields many neutrons in most fusor systems (generally, 200 watts power is a better goal.) However, the high pressure can compensate in a small chamber for lower voltages but that is extremely low operating voltage/power. S...
by Dennis P Brown
Thu Jan 17, 2019 1:36 pm
Forum: Please Introduce Yourself
Topic: Hello Everyone!
Replies: 1
Views: 189

Re: Hello Everyone!

Best of luck on finding parts; do consider if your school has a proper vacuum pump and maybe a usable vacuum gauge for it. That can get you started on vacuum work and testing.
by Dennis P Brown
Thu Jan 17, 2019 1:33 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 16
Views: 617

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

I would think that your design for your 50 kV power supply would be a great post. You should consider that since that would be both useful and insightful for other people here. Also, maybe include your construction of your new 70 kV system, as well, as it progresses. Sharing methodologies and practi...
by Dennis P Brown
Wed Jan 16, 2019 10:52 pm
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 16
Views: 617

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Congratulations on really good work; few get both neutron detection via a tube and Ag activation for their first runs to join the neutron club.