Search found 280 matches

by Dan Knapp
Sun Jan 24, 2016 6:21 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Helium-3 detector operating mode
Replies: 2
Views: 2319

Helium-3 detector operating mode

Helium-3 detector tubes can be operated in ionization chamber, proportional, or Geiger-Mueller mode depending upon the anode voltage. Miley and Murali, in their book Inertial Electrostatic Confinement (IEC) Fusion (Springer, 2014, p. 291) state that for IEC devices, “the ion chamber mode is generall...
by Dan Knapp
Tue Dec 22, 2015 2:08 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Deuterium storage
Replies: 13
Views: 6877

Re: Deuterium storage

Deuterium is essentially chemically identical to hydrogen (in that it undergoes the same chemical reactions) but reaction rates are different (slower) due to the kinetic isotope effect. Isotopes differ in physical properties, which is most likely the basis of the membrane separation process noted. T...
by Dan Knapp
Sat Dec 12, 2015 12:36 pm
Forum: Interesting Links
Topic: The Wendelstein 7-X (W7-X) Stellarator
Replies: 6
Views: 7410

Re: The Wendelstein 7-X (W7-X) Stellarator

Oliphant did his pioneering fusion work at the Cavendish Laboratory in Cambridge. He went to the ANU after the war and established the physics lab there. It can be argued that Cockcroft and Walton actually did the first fusion when they bombarded lithium with protons.
by Dan Knapp
Fri Nov 06, 2015 2:00 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Molybdenum Inner Grid
Replies: 6
Views: 3400

Re: Molybdenum Inner Grid

They use thin sheet to maximize transparency (with radial edges) while maintaining structural strength.
by Dan Knapp
Thu Nov 05, 2015 1:41 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Molybdenum Inner Grid
Replies: 6
Views: 3400

Re: Molybdenum Inner Grid

If you decide to go with molybdenum, a good source for small quantities of molybdenum wire is: http://electrontubestore.com/. They also have stainless, tungsten, tungsten-rhenium, titanium, and tantalum wire in different sizes. Their tungsten wire is annealed, so it is easy to bend. Another source f...
by Dan Knapp
Thu Nov 05, 2015 1:06 am
Forum: Fusion --- Past, Present, and Future
Topic: IEC2015 Presentations
Replies: 5
Views: 3229

IEC2015 Presentations

The presentations from the 2015 US-Japan Workshop are now online at:
http://iec2015.es.titech.ac.jp/presentation/index.html
by Dan Knapp
Tue Nov 03, 2015 12:36 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Molybdenum Inner Grid
Replies: 6
Views: 3400

Re: Molybdenum Inner Grid

Molybdenum has been used extensively in published IEC work, particularly by groups in Japan. They tend to make the grids from rings cut from thin sheet material. Amateur fusor builders would generally not have the capability to cut such rings.
by Dan Knapp
Mon Nov 02, 2015 9:48 pm
Forum: Advanced Technical Discussion Area
Topic: Positive Electrostatic Fusion Reactor
Replies: 22
Views: 11065

Re: Positive Electrostatic Fusion Reactor

It should be mentioned in this discussion that the idea of "pumping" an ion cloud by alternate electrostatic expansion and compression in a fusion reactor is not a new idea; it was pursued by the Los Alamos group back in the nineties as the "periodically oscillating plasma sphere" or "POPS." For det...
by Dan Knapp
Thu Oct 16, 2014 11:27 pm
Forum: Fusion --- Past, Present, and Future
Topic: Is this part of EMC2 research finally coming to light?
Replies: 15
Views: 7984

Re: Is this part of EMC2 research finally coming to light?

Original post of patent numbers has been corrected.
For some reason the Google Patent search function is having trouble pulling these up.
The direct links are:
http://www.google.com/patents/US20140301517,
http://www.google.com/patents/US20140301518,
http://www.google.com/patents/US20140301519
by Dan Knapp
Thu Oct 16, 2014 11:14 pm
Forum: Fusion --- Past, Present, and Future
Topic: Is this part of EMC2 research finally coming to light?
Replies: 15
Views: 7984

Re: Is this part of EMC2 research finally coming to light?

Sorry, transcription error. Correct numbers are:
US20140301517, US20140301518, US20140301519.
Thanks for catching this.