Fusor Forums

Your work seems very promising to me. But what purpose is served by the boric acid? Does it improve the mechanical properties of powdered metal pellets, or have another use in the pressed-pellet business? I think it's bad to have boron anywhere close to where you want lots of thermal neutrons. Since...

It's said that resourceful amateurs made working fusors before the Internet existed. Kids today think anything you can't click-to-buy within 5 minutes online is "hard to get". For intangible stuff like answers to questions, they think "due diligence with one's own searches" amounts to single-digit m...

Permanent magnet measurement exercise is complete. Ought to be good practice for using fluxmeter to learn about flux leakage in Big Three Inch electromagnet project. I told the details step by step on another forum, as they unfolded: https://highvoltageforum.net/index.php?topic=819.0 That's differen...

Please don't lose sleep over it.
I did some spot checking of posts from 15 years ago. Some images "no longer present", some are just fine.

Any chance there are 3rd party backups somewhere?

First real measurement of the radial flux density, B, indicated 0.60 teslas. That's much lower than I'd guessed at the beginning. It's roughly consistent with last night's initial SWAG, based on a copper pipe's physical parameters and rate of descent, judged by eye. I still don't know the sign, whic...

Not sure whether to dust off this old thread, or start a new one for a tangential topic. The next step for BTI magnet project is to measure the flux distribution, quantitatively. How will the fraction which fringes out or leaks away go up, as the air gap length increases from zero to 1 inch? It'll b...

Thanks for the pointer, Richard. Anybody here have experience with, or recommendations for, airborne-radon test brands? (Collection kit + lab to which you send the sample) California is one of the states that requires test providers to be certified. One web search brought up a kit sold by Home Depot...

Josh, it's best to do that kind of experiment with a quantitative forecast about the outcome. Exercises for you, starting with overly simple ones: 1. Suppose you have a 1 cm thick slab of natural Li, with some flux of thermal neutrons coming from one side. What fraction of the neutrons will be stopp...

Last year I used unpressurized liquid propane as a freezing bath, outdoors in a well ventilated area, with excellent success. Started with a thermos full, drawn from a BBQ tank so old it still has a POL valve. Glad to be with Dennis on a safety thing! Am reminded of one classic HV high bandwidth sco...

Please excuse one answer to a question addressed to somebody else. Some of my co-workers worked on a Fluorinert-cooled instrument during years when I worked elsewhere, and I will ask about it on Monday. Meanwhile, LMGTFY. Found a lot here: https://detector-cooling.web.cern.ch/detector-cooling/data/3...