Search found 194 matches

by Dan Knapp
Fri Aug 24, 2018 11:47 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1095

Re: convectron 275 tube and controller

I have a suggestion for making the proprietary tube connector, or any connector for that matter. Years ago I had a kit for making the inserts for mil spec AN connectors. It consisted of loose pins and pin sockets that you placed in the sockets or on the pins of the connector you need to mate, and th...
by Dan Knapp
Sat Aug 18, 2018 3:46 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Miniature toroid guard rings for electrical stress mitigation
Replies: 0
Views: 553

Miniature toroid guard rings for electrical stress mitigation

A metal conductor in contact with an insulator in air or vacuum forms a dielectric "triple point" where the conductor, insulator, and air (or vacuum) meet. Field lines from high voltage on the conductor are pushed out of the higher dielectric insulator to form a concentrated electrical field in the ...
by Dan Knapp
Tue Jul 31, 2018 2:57 pm
Forum: Please Introduce Yourself
Topic: Hello From Rural Dorset
Replies: 6
Views: 585

Re: Hello From Rural Dorset

I erroneously said "NRD" in my post above. It should have read "NSD" (http://www.nsd-fusion.com) (original post has been edited). They claim 20,000 hour lifetime for their sealed tube system. It's not exactly IEC in the usual sense. Instead of a grid, they use a solid cylinder target surface in a cy...
by Dan Knapp
Mon Jul 30, 2018 12:43 pm
Forum: Please Introduce Yourself
Topic: Hello From Rural Dorset
Replies: 6
Views: 585

Re: Hello From Rural Dorset

Fusors don’t “require” flowing deuterium. It’s easiest to adjust pressure with a flowing system, but some fusors operate in sealed mode. One just needs a very good vacuum system to hold vacuum for any useful period of time. I was just reading Doug Coulter’s posts. He does not use flowing deuterium. ...
by Dan Knapp
Mon Jul 30, 2018 2:29 am
Forum: Announcements and Site Administration Topics
Topic: Going Out On A Limb
Replies: 14
Views: 2037

Re: Going Out On A Limb

I read Doug’s latest postings, but it’s not clear at all what he’s doing there. Is he trying to do POPS?
by Dan Knapp
Sat Jul 21, 2018 2:10 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: In-Vacuum Electrical Connectors
Replies: 2
Views: 728

Re: In-Vacuum Electrical Connectors

Years ago we made our own connectors for connecting wires and posts on ion sources. We cut pieces of 1/8" OD stainless tubing, drilled and tapped (0-80) a hole about 1/8" from each end, and put in 0-80 x 1/8" pan head screws. We used pan head screws rather than set screws because it was easy to lose...
by Dan Knapp
Tue Jul 17, 2018 2:48 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Somebody got quite a deal on eBay
Replies: 1
Views: 402

Somebody got quite a deal on eBay

There was a Ludlum 15 neutron detector with two helium-3 tubes and moderators that sold for $510 on eBay yesterday. (search ludlum 15 neutron in completed listings to see it; the link won't work for completed listings) This detector is a combination geiger probe/neutron detector. One of the neutron ...
by Dan Knapp
Thu Jul 05, 2018 1:42 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Maximus Energy NEUTRON-PRO neutron detector
Replies: 2
Views: 1009

Maximus Energy NEUTRON-PRO neutron detector

There is a neutron detection system called the "Maximus Energy NEUTRON-PRO touch-screen neutron detection and spectroscopy system in Faraday enclosure" being sold on eBay for $1695. It uses a He-3 tube and is totally self contained in a Faraday shield. This would seem to be a good solution to the el...
by Dan Knapp
Thu Jul 05, 2018 11:12 am
Forum: Fusion --- Past, Present, and Future
Topic: First IAEA Workshop on Fusion Enterprises
Replies: 2
Views: 849

First IAEA Workshop on Fusion Enterprises

The First IAEA Workshop on Fusion Energy was held recently in Santa Fe. The presentations are now posted at: https://nucleus.iaea.org/sites/fusionportal/Pages/Enterprises/2018/General-Info.aspx One I found particularly interesting was about work at the University of Wisconsin revisiting the mirror m...