Search found 219 matches

by Dan Knapp
Sun Jan 20, 2019 9:16 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Institutional Quackery
Replies: 5
Views: 164

Re: Institutional Quackery

I read this paper several years ago and noticed things that suggest this is a proposed fusion reactor and the data shown are only calculated simulations. I think the author failed to clearly point out that he hadn't actually built the reactor and demonstrated its function. Some flags are: 1. It is a...
by Dan Knapp
Sat Jan 19, 2019 7:13 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 18
Views: 484

Re: 50kV Supply

Disregard my question.
by Dan Knapp
Sun Jan 13, 2019 11:28 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 15
Views: 714

Re: Neutron Test Sources Po210+Be or U238+Be?

There is no exempt quantity for any neutron source. I spent some time a year or so ago interacting with the NRC on this issue. We were talking with the NRC people about petitioning for establishment of an exempt quantity for Californium-252 (the most commonly used neutron source). This was involved ...
by Dan Knapp
Sat Jan 12, 2019 7:49 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Test Sources Po210+Be or U238+Be?
Replies: 15
Views: 714

Re: Neutron Test Sources Po210+Be or U238+Be?

Dennis stated in an earlier reply that a neutron source could be rented. I don't think one could rent a neutron source without an NRC license. Can he be more specific about this? Was he referring to the Polonium alpha source that Staticmaster leases?
by Dan Knapp
Thu Jan 10, 2019 12:47 pm
Forum: Announcements and Site Administration Topics
Topic: Final report on fusion from National Academies has been released
Replies: 0
Views: 167

Final report on fusion from National Academies has been released

The Final Report of the Committee on a Strategic Plan For U.S. Burning Plasma Research (National Academies of Sciences, Engineering, and Medicine) has been released. It can be accessed via a link from the “FIRE” web site: firefusionpower.org. A pdf copy is also presumably available for free downlod ...
by Dan Knapp
Sun Dec 30, 2018 6:19 pm
Forum: Please Introduce Yourself
Topic: Hello from Michigan USA
Replies: 4
Views: 287

Re: Hello from Michigan USA

There is still the opportunity to improve the neutron production rate in a fusor. Several university groups have been pursuing this for years, and continue to do so. There is always opportunity for innovation in any device. But one should become familiar with what has already been done so as not to ...
by Dan Knapp
Fri Nov 30, 2018 12:25 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Electron Impact Ion Source pictures wanted
Replies: 3
Views: 924

Re: Electron Impact Ion Source pictures wanted

The ion sources I’ve worked with were typically about a 15 x 15 x 10 mm “box” with the ion exit hole centered on a 15 x 15 side. The holes were on the order of about 2 mm diameter. For RGA’s, the “box is more open to sample the vacuum environment. For externally introduced samples, an insulating tub...
by Dan Knapp
Mon Nov 26, 2018 1:06 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Electron Impact Ion Source pictures wanted
Replies: 3
Views: 924

Re: Electron Impact Ion Source pictures wanted

Mass spectrometer electron impact ions sources tend to be of relatively simple construction. I’ve worked on dozens of different ones in my forty plus years in that business. They are essentially a box (“ion volume”) with an ion exit hole usually orthogonal to the electron beam, which is provided typ...
by Dan Knapp
Thu Nov 22, 2018 1:53 pm
Forum: Advanced Technical Discussion Area
Topic: Harbor Freight freebie meters
Replies: 12
Views: 1339

Re: Harbor Freight freebie meters

It looks like I should have been aware of the 1 Meg input resistance if I had remembered some previous posts on these meters, but at my age I’m doing well to remember my name. At any rate, my post precipitated some interesting discussion. I have an unrelated question that relates to my present task ...
by Dan Knapp
Tue Nov 20, 2018 1:09 pm
Forum: Advanced Technical Discussion Area
Topic: Harbor Freight freebie meters
Replies: 12
Views: 1339

Harbor Freight freebie meters

This is not exactly advanced technical discussion, but I didn’t find a more appropriate section. The Harbor Freight red digital multimeters have been mentioned multiple times. I just discovered yesterday that these have only a 1 megohm input impedance. Nowhere in the manual or online specifications ...