Search found 10812 matches

by Richard Hull
Thu Jun 28, 2018 4:15 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: xray transformer
Replies: 7
Views: 512

Re: xray transformer

Would you be the Earl of Dwyfor and former PM of Great Britain.

Richard Hull
by Richard Hull
Thu Jun 28, 2018 3:33 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 24
Views: 1520

Re: Couple of questions

The shadow cone shield is fully effective for x-rays and fast neutron in the fusor environment. Yes, x-rays and even neutrons scatter, but the real danger is the head on rather straight line emission as you face the working fusor at close range. Compared to the head-on that is 99.999% absorbed by a ...
by Richard Hull
Wed Jun 27, 2018 9:01 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 24
Views: 1520

Re: Couple of questions

30 volts will not create a plasma in the fusor based pressure. In the 866 mercury vapor rectifiers and mercury thyratrons, you developed a true arc in a rarefied metal vapor with a heated filament blasting out tons of electrons. These arcs could not be cut off, once started, unless the voltage acros...
by Richard Hull
Wed Jun 27, 2018 4:55 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Couple of questions
Replies: 24
Views: 1520

Re: Couple of questions

I don't think a 30v supply will create a plasma. 30kv @10 ma will. (30,000 volts @ .01 amps)

Richard Hull
by Richard Hull
Sat Jun 23, 2018 8:19 am
Forum: Images du Jour
Topic: Deposition within a fusor
Replies: 4
Views: 1459

Re: Deposition within a fusor

Of course what these patterns are is immaterial to the operation of a fusor, as is how they are made or by what mechanism. They are an observation that no one has written a scholarly paper on in these forums. The lozenges, diamond shaped patterns, are in perfect alignment with the re-combining beams...
by Richard Hull
Sat Jun 23, 2018 7:26 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Build a HV bias meter for free.
Replies: 9
Views: 2067

Re: Build a HV bias meter for free.

As noted above the accuracy of these free or $5.99 meters tends to rival that of a good Fluke or Beckman DVM. Mistakes blow up meters like leaving the meter on ohms and connecting it to 2kv. Or placing the meter in the 20ma current position and then measuring a 12 volt power buss. This particular is...
by Richard Hull
Sat Jun 23, 2018 6:39 am
Forum: New User Chat Area
Topic: Is baking worth it?
Replies: 16
Views: 1418

Re: Is baking worth it?

I have not glow cleaned in a couple of years. Instead, I drag the system down to about 12 microns with the mechanical pump and then turn on the diff pump and it goes into the 10e-4 torr range. I then differentially pump with D2. Thus, the junk is blasted out of the walls and D2 is buried in the shel...
by Richard Hull
Fri Jun 22, 2018 4:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Ballast resistor construction
Replies: 11
Views: 891

Re: Ballast resistor construction

It is always important to figure the load and voltage gobbling power of your ballast. the two 100k in series is 200k. Regardless of voltages fed, be it 10kv or 100kv, it is the current that is the player here. At 10ma into the fusor, you would loose 2kv in the ballast here and 20 watts of power. Two...
by Richard Hull
Sun Jun 17, 2018 5:03 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 1725

Re: FAQ - Extensive paper on neutron activation

Internet content, websites and data can disappear, websites die or be re-named, data that might prove dual use, get pulled off. Assume the internet is a place loaded with material that may or may not be there again, once found long ago. Whatever is in a book is there for as long as the book exists. ...
by Richard Hull
Sun Jun 17, 2018 4:49 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Atlas of Neutron Capture Cross Sections
Replies: 3
Views: 724

Re: Atlas of Neutron Capture Cross Sections

I recently got a soft cover version for $4.00 off ABE postpaid!! There appears to be a number of more recent compilations all in paper back/soft cover. Tons of 'em!!! You can learn a lot about nuclear physics just by roaming around in these tables, assuming you have a bit of background in nuclear ph...