Search found 209 matches

by Dan Knapp
Mon Nov 12, 2018 3:21 am
Forum: New User Chat Area
Topic: Crystal synthesis inside a vacuum?
Replies: 3
Views: 177

Re: Crystal synthesis inside a vacuum?

That’s how they make synthetic diamonds (as well as other crystals), but they don’t start with powders; they use gaseous precursors. It is a very slow process and requires extremely well controlled conditions.
by Dan Knapp
Thu Nov 01, 2018 2:15 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Detector and Moderator Test
Replies: 9
Views: 892

Re: Neutron Detector and Moderator Test

Kai I can’t offer any input on your numbers, but the fact that the moderator increases your counts suggests you are indeed counting neutrons. You haven’t demonstrated selectivity for neutrons over gammas (the Troxler gauge also contains a cesium-137 gamma source), so some of your counts could be fro...
by Dan Knapp
Tue Oct 30, 2018 3:17 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Titanium walls
Replies: 10
Views: 1539

Re: Titanium walls

Check the presentations from the recent fusion neutron sources meeting at: http://www.fusor.net/board/viewtopic.php?f=47&t=12463 The Kyoto group saw a fourfold increase in neutron production going from a stainless steel chamber to a titanium chamber. This group is one of the top IEC labs in the worl...
by Dan Knapp
Thu Oct 18, 2018 9:34 pm
Forum: Announcements and Site Administration Topics
Topic: Abstracts posted for 20th US-Japan IECF Workshop
Replies: 6
Views: 1278

Re: Abstracts posted for 20th US-Japan IECF Workshop

The meeting was held on Tuesday this week. It was a full day of very interesting presentations. Of possible interest to this group in particular, the Kansai University group reported results from fusors using cubic anodes and cathodes. The cubic shapes are easier to construct than spherical grids. T...
by Dan Knapp
Mon Oct 08, 2018 2:54 pm
Forum: Announcements and Site Administration Topics
Topic: Abstracts posted for 20th US-Japan IECF Workshop
Replies: 6
Views: 1278

Abstracts posted for 20th US-Japan IECF Workshop

The 20th US-Japan Workshop on Fusion Neutron Sources for Nuclear Assay and Alternate Applications (formerly called workshop on IECF) will be held next week at the University of Maryland. The abstracts for the meeting are now posted at: https://blog.umd.edu/iecf/posterspresentations/ Of particular in...
by Dan Knapp
Sun Oct 07, 2018 6:21 pm
Forum: Images du Jour
Topic: The start towards Fusion
Replies: 1
Views: 330

Re: The start towards Fusion

Jess, I commend you on your creativity, but I must admonish you that you created a significant safety hazard. Any glass vacuum chamber carries some risk, but that glass jar is totally unsuited for vacuum use, especially with plasma inside. Even a glass vessel designed for vacuum use should have a sa...
by Dan Knapp
Mon Oct 01, 2018 8:06 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Operating three phase high voltage power supply on single phase power
Replies: 10
Views: 1293

Re: Operating three phase high voltage power supply on single phase power

Rich, It appears to me that your diagrammed connections would work to accomplish a slightly larger bucking ratio. It still looks like the full load current is only going through the larger gauge LV windings. They don't have this connection scheme in their instruction sheet. I don't now if there is a...
by Dan Knapp
Sun Sep 30, 2018 3:31 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Operating three phase high voltage power supply on single phase power
Replies: 10
Views: 1293

Re: Operating three phase high voltage power supply on single phase power

I just verified that the supply will indeed run on single phase power. The attached photos show the powered up supply (only cranked up to 2 kV because the probe connection to the HV was dangling in mid air) and the power adapter. I used a buck transformer to drop my 240VAC to within the 208VAC +/-10...
by Dan Knapp
Thu Sep 27, 2018 11:40 am
Forum: New User Chat Area
Topic: Would a heated Barium oxide filament survive in a deuterium environment?
Replies: 4
Views: 300

Re: Would a heated Barium oxide filament survive in a deuterium environment?

Some university IEC researchers (e.g. the University of Wisconsin group) routinely use filaments in their reactors, but I don’t recall seeing anyone use a barium oxide coated filament. Bare tungsten is commonly used, and a convenient source is light bulb filaments.