Search found 397 matches

by Bob Reite
Tue Sep 07, 2021 11:11 pm
Forum: FAQs: Fusion and Fusor Theory
Topic: Tritium!! We make it, sure, but can't use an atom of it!
Replies: 3
Views: 276

Re: Tritium!! We make it, sure, but can't use an atom of it!

It is a good thing that we can't make detectible amounts of tritium in our amateur fusors. One is not allowed to possess tritium in the United States without the appropriate license from the NRC.
by Bob Reite
Sat Aug 07, 2021 5:12 pm
Forum: Please Introduce Yourself
Topic: Aerospace Engineer in Seek of Viable Airborne Power Source
Replies: 22
Views: 1919

Re: Aerospace Engineer in Seek of Viable Airborne Power Source

I went on as a guest, and clicked the "register" link and got the rules. The "use your real name" and "Your first post is introduce yourself" rules are the very first. But all of the text is "normal" small font. Perhaps the first two rules should be in bold as those are the rules we have the most tr...
by Bob Reite
Thu Jul 29, 2021 5:15 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fun with the scope or what happens at the breakdown?
Replies: 7
Views: 718

Re: Fun with the scope or what happens at the breakdown?

Funny you should mention that. It was on my "to do' list, so no better time than now to do it. Mostly just broad band noise, with no real peaks, but sometimes I would get a capture like this look from 50 KHz to 5 MHz: analyzer.jpg Note the two peaks. The interesting one is at 941 KHz. Not the 940 st...
by Bob Reite
Wed Jul 28, 2021 4:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fun with the scope or what happens at the breakdown?
Replies: 7
Views: 718

Re: Fun with the scope or what happens at the breakdown?

Guess I need to bring my 9 kHz to 7.1 GHz spectrum analyzer to HEAS this October and compare the RF noise from Richards fusor with Dougs.
by Bob Reite
Sat Jul 24, 2021 7:19 pm
Forum: Images du Jour
Topic: New Home for Doug's Fusor
Replies: 55
Views: 12256

Re: New Home for Doug's Fusor

I finally got silver to activate to a decent degree. Two runs give about 550 counts per minute at shutdown, well above background so I know it's not a fluke. Here is a graph: Silver_Activation.png I know that people will ask how this is obtained, so here goes: The data aq of this system counts pulse...
by Bob Reite
Sat Jul 17, 2021 11:24 pm
Forum: Images du Jour
Topic: New Home for Doug's Fusor
Replies: 55
Views: 12256

Re: New Home for Doug's Fusor

Doug never operated the fusor above 50 KV. The most that make and model of supply will do is 51.something KV. The ion grid is at an even lower voltage. Before Doug switched to remote control, he lead shielded the entire fusor, except for the front viewport which had a sheet of leaded glass, out of a...
by Bob Reite
Sat Jul 17, 2021 9:36 pm
Forum: Images du Jour
Topic: New Home for Doug's Fusor
Replies: 55
Views: 12256

Re: New Home for Doug's Fusor

While I will use the REM Ball and the Hornyak button detectors to aid in tuning the fusor, I will not claim success until confirmed by activation of an element, or even better, a bubble dosimeter reading. Because of the six to nine mouth shelf life of the bubble detectors, I probably won't order one...
by Bob Reite
Fri Jul 16, 2021 2:57 am
Forum: FAQs: Vacuum Technology
Topic: FAQ - Turbo pump versus Diffusion pump
Replies: 9
Views: 17010

Re: FAQ - Turbo pump versus Diffusion pump

Peter in another thread expressed concern about operating turbomolecular pumps continuously. In fact full time operation of turbo pumps is what they were designed to do. Pfeiffer advises against "long term storage" of a turbo pump. If shut down for more than three years Pfeiffer states the the beari...
by Bob Reite
Fri Jul 16, 2021 2:22 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Using Silver (or other element) Activation to Quantify Neutron Output
Replies: 17
Views: 2214

Re: Using Silver (or other element) Activation to Quantify Neutron Output

While not the precision we would like, Richard gave me an insight for at least determining the order of magnitude of neutron output using the results of silver activation. The test set up would be silver foil, inside a moderator which also has a geiger tube that is sensitive to beta radiation. A CDV...

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