Search found 275 matches

by Dan Knapp
Thu Feb 04, 2021 1:08 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Heat pipe cooling
Replies: 3
Views: 430

Re: Heat pipe cooling

I don’t think vise grips are the answer. Pinch off seals are normally made with more of a cutter type tool. Try using large diagonal cutters.
by Dan Knapp
Sun Jan 03, 2021 2:56 am
Forum: Vacuum Technology (& FAQs)
Topic: Preventing Stuck Swageloks?
Replies: 4
Views: 587

Re: Preventing Stuck Swageloks?

Sounds like you may be tightening them too much. A new 1/8 inch fitting should only be tightened 3/4 turn past finger tight (1–1/4 turns for larger fittings).
by Dan Knapp
Sun Nov 29, 2020 9:05 pm
Forum: Vacuum Technology (& FAQs)
Topic: Home built mass spectrometer
Replies: 15
Views: 2187

Re: Home built mass spectrometer

Richard, My mistake. I overlooked that you said beta energy. The spectrometers I was talking about are for much lower energy electrons.
by Dan Knapp
Sun Nov 29, 2020 1:41 pm
Forum: Vacuum Technology (& FAQs)
Topic: Home built mass spectrometer
Replies: 15
Views: 2187

Re: Home built mass spectrometer

Richard, Most electron spectrometers used in surface analysis use electrostatic deflection with either a cylindrical or hemispherical analyzer. A cylindrical electrostatic analyzer spectrometer would probably be easier to build than a magnetic deflection machine. There is a huge literature on these ...
by Dan Knapp
Tue Oct 27, 2020 12:26 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Irradiated Dime REDUX
Replies: 11
Views: 1248

Re: Neutron Irradiated Dime REDUX

Richard, Have you considered a thin layer of rhodium plating? There are various rhodium plating services available for jewelry at affordable prices.
by Dan Knapp
Mon Oct 05, 2020 8:11 pm
Forum: Interesting Links
Topic: MIT claim of fusion by 2025 proving LOL isn't just for the tweeter
Replies: 7
Views: 2046

Re: MIT claim of fusion by 2025 proving LOL isn't just for the tweeter

The seven papers in the special issue of the Journal of Plasma Physics are available online with open access: https://www.cambridge.org/core/journals/journal-of-plasma-physics/collections/status-of-the-sparc-physics-basis Much of the content of these papers is beyond my level of understanding, but t...
by Dan Knapp
Fri Oct 02, 2020 11:43 am
Forum: Interesting Links
Topic: MIT claim of fusion by 2025 proving LOL isn't just for the tweeter
Replies: 7
Views: 2046

Re: MIT claim of fusion by 2025 proving LOL isn't just for the tweeter

If you read the NYT article carefully, you will see that they just published seven peer reviewed papers in the Journal of Plasma Physics that support their design. I am painfully aware of the difference between a computer model and real hardware, but they have gone much further than most fusion comp...
by Dan Knapp
Thu Sep 17, 2020 11:41 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Earth-tech fusor from 1999
Replies: 2
Views: 614

Re: Earth-tech fusor from 1999

This is a very interesting description of this early fusor. Something I’ve not seen before was his use of the secondary of a neon transformer as a high voltage inductive filter.
by Dan Knapp
Fri Sep 11, 2020 12:37 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Effectiveness of water (H2O) on fast neutrons?
Replies: 3
Views: 763

Re: Effectiveness of water (H2O) on fast neutrons?

This has been discussed previously at length. Search “water as a neutron shield.”