Search found 1558 matches

by Frank Sanns
Wed Jun 07, 2017 9:33 pm
Forum: New User Chat Area
Topic: Boards for Bob Higgins slow neutron detector
Replies: 8
Views: 1239

Re: Boards for Bob Higgins slow neutron detector

There must be old radium dial clocks, watches, or aircraft gauges available. They make perfect check sources and for nulling out background for neutron tubes.
by Frank Sanns
Fri Jun 02, 2017 2:58 am
Forum: New User Chat Area
Topic: The Maths Needed
Replies: 4
Views: 842

Re: The Maths Needed

These are easy calculations.


Gas flow=deuterium flow+leak rate+outgassing

Neutron emission=0.5 x fusion rate

Temperature (K)= 1.16E4 input voltage

Electric field (V/m)= Input V/inter grid distance

Magnetic field=There are no magnets. The fusor is symmetrical so no net magnetic field.
by Frank Sanns
Fri Apr 28, 2017 9:34 pm
Forum: New User Chat Area
Topic: Better alternative to glass as a first vacuum chamber
Replies: 2
Views: 712

Better alternative to glass as a first vacuum chamber

I have no idea why so many new people want to use glass as their chambers. IT IS DANGEROUS TO USE GLASS. It can get a beam hot spot and implode sending shards of glass everywhere even sometimes through a scatter shield. It also does not stop soft x-rays so it does not provide a shield area for the o...
by Frank Sanns
Thu Apr 27, 2017 3:46 am
Forum: Vacuum Technology (& FAQs)
Topic: Has anyone used these small plastic vacuum desiccators?
Replies: 7
Views: 1382

Re: Has anyone used these small plastic vacuum desiccators?

The glass variant with high vacuum grease on the mating surfaces and the vacuum port on the lid will hold a decent vacuum for a long time as in months. No outgassing there and a very slow leak down rate. The other technique with these is to put some desiccant in them to keep totally dry if any air g...
by Frank Sanns
Mon Apr 03, 2017 1:27 am
Forum: The Trading Post
Topic: Sources for Fusor Related Items
Replies: 20
Views: 9690

Re: Sources for Fusor Related Items

Thanks. Added.
by Frank Sanns
Sun Apr 02, 2017 6:05 pm
Forum: The Trading Post
Topic: Sources for Fusor Related Items
Replies: 20
Views: 9690

Sources for Fusor Related Items

Most people look to eBay and other sources to scrounge for their fusor items. I thought it may be helpful to create a sticky here in the trading post for the new people so they know where to find some of the more common items. Feel free to add to the list and I will incorporate ones that I think are...
by Frank Sanns
Thu Mar 09, 2017 11:14 am
Forum: Announcements and Site Administration Topics
Topic: Unconfirmed Record Neutron Production
Replies: 6
Views: 1962

Re: Unconfirmed Record Neutron Production

The two things that struck me were the high neutron numbers and in a residence. Most likely, somebody has a DT beam on target generator as Richard has pointed out. That would be the smallest and highest output. The person probably works in the drilling or other industrial area that uses licensed neu...
by Frank Sanns
Wed Mar 08, 2017 5:57 pm
Forum: Announcements and Site Administration Topics
Topic: Unconfirmed Record Neutron Production
Replies: 6
Views: 1962

Unconfirmed Record Neutron Production

Yesterday at a technical meeting, a retired physics professor asked me about a fusor(?) up in the San Fransisco Bay area. He was aware of an amateur fusion reactor that was around a foot in diameter and of all metal construction and run at a substantial vacuum. It sure sounded like a fusor to me. Wh...
by Frank Sanns
Mon Feb 27, 2017 8:23 pm
Forum: New User Chat Area
Topic: Neutron Counting Question
Replies: 3
Views: 1008

Re: Neutron Counting Question

Go to the main page of the fusor.net Board (index).

It says Start Here in the main subheading.

Under that heading is FAQs.

Once you click on it, there are subcategories for each set of compiled FAQs.
by Frank Sanns
Fri Feb 17, 2017 9:18 pm
Forum: New User Chat Area
Topic: How much does deuterium purity matter?
Replies: 5
Views: 1026

Re: How much does deuterium purity matter?

Ultra high purity for fusion is a waste of money. I seriously doubt the average fusioneer would be able to detect a difference between 95% deuterium and 99.99999999%. In fact, when a fusor first starts up, is starting to to trickle out neutrons, and the color of the plasma is ruddy, I would not be s...