Search found 253 matches

by Bob Reite
Wed Mar 13, 2019 12:39 am
Forum: Please Introduce Yourself
Topic: Hello from Hawaii!
Replies: 2
Views: 515

Re: Hello from Hawaii!

Or put in the _ character.
by Bob Reite
Sun Mar 10, 2019 6:26 pm
Forum: New User Chat Area
Topic: Advice for using microwaves to ionize deuterium?
Replies: 7
Views: 628

Re: Advice for using microwaves to ionize deuterium?

I wouldn't say that building a shielded fusor for 2.4 GHz would be that difficult. You hopefully are using a stainless steel chamber of some sort. The viewport would require a screen, like is seen on a microwave oven window. The vacuum inlet would probably require a screen as well. I do agree that e...
by Bob Reite
Sun Mar 10, 2019 6:03 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor grid material
Replies: 4
Views: 698

Re: Fusor grid material

Yes! Doug Coulter makes his grids partially out of tungsten tig welding rods, with end caps out of graphite, which can stand very high temperatures as long as it's in a reducing atmosphere (which it will be if you are flowing D2) or good vacuum.
by Bob Reite
Sun Mar 10, 2019 6:01 pm
Forum: New User Chat Area
Topic: Fusor grid material
Replies: 2
Views: 290

Re: Fusor grid material

Yes! Doug Coulter makes his grids partially out of tungsten tig welding rods, with end caps out of graphite, which can stand very high temperatures as long as it's in a reducing atmosphere (which it will be if you are flowing D2) or good vacuum.
by Bob Reite
Sat Mar 02, 2019 2:42 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Maybe someone can help?
Replies: 8
Views: 848

Re: Maybe someone can help?

A lot of the problem is that people are used to systems that do not allow a space in the login name, and some even crab about the underline character, so that's why they resort to other names. I was under this misconception and my login name was br2600, but in the space provided for "Real name" I us...
by Bob Reite
Tue Jan 22, 2019 1:03 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 5327

Re: Construction of Neutron Grade Fusor

You must be getting backscatter from something. My lead shield is just 0.035 inch think, yet I can go to 55 KV without any detectable X-rays on the other side of the shield. All people still stand at least 6 feet away from my machine while it is operating. When I do in and out of moderator tests, I ...
by Bob Reite
Fri Jan 18, 2019 3:28 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 5327

Re: Construction of Neutron Grade Fusor

Since you have a 70KV supply I would increase your ballast resistor to 2.5 megohms! Yes, that's 2,500,000 ohms. Assuming that you are drawing 8 mA, that in theory should drop only 20 KV across the resistor leaving 50 KV across the fusor, assuming that your supply does put out an honest 70 KV at 8 mA...
by Bob Reite
Wed Jan 16, 2019 2:35 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 2343

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

Measure the distance between the contacts on that edge connector. Then you should be able to find a mating card edge connector at Mouser or Digikey.
by Bob Reite
Sat Jan 05, 2019 7:21 am
Forum: Announcements and Site Administration Topics
Topic: No more attachments (images) allowed!
Replies: 12
Views: 1374

Re: No more attachments (images) allowed!

Can't you set a size limit on images uploaded? File size that is.
by Bob Reite
Wed Jan 02, 2019 12:15 am
Forum: Announcements and Site Administration Topics
Topic: No more attachments (images) allowed!
Replies: 12
Views: 1374

Re: No more attachments (images) allowed!

I was going to suggest hosting any large photos on your own server. That's what I do for other sites that have limited upload space.