Search found 2516 matches

by Chris Bradley
Sun Nov 30, 2014 9:44 am
Forum: Fusion --- Past, Present, and Future
Topic: Another claim of a Fusion "Breakthrough"
Replies: 19
Views: 9208

Re: Another claim of a Fusion "Breakthrough"

McGuire is an interesting guy - very bright, apparently. He is a MIT grad, who did his thesis on multi-grid fusors. He seems to be a fountain of ideas. IMO, his thesis is riddled with questionable presumption upon presumption. I'm somewhat surprised it passed viva. I'm not saying that sometimes a p...
by Chris Bradley
Sun Nov 30, 2014 9:32 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: A Rundown on Some of the Small Players
Replies: 6
Views: 3958

Re: A Rundown on Some of the Small Players

No mention of me and my epicyclotron? ;) Why is that? Because this isn't about the promise and progress of fusion, it is about the promise and progress of how successful people are at attracting funding. There are, and have been, many many useless schemes in business and research over the last centu...
by Chris Bradley
Fri Nov 21, 2014 7:53 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Revisiting an old topic - Wall loading
Replies: 11
Views: 6785

Re: Revisiting an old topic - Wall loading

I think my opinion on wall loading in a fusor is well known now, but I'll just add it to the 'information point' here - if there were significant beam-beam or beam-background reactions I should have seen lots of neutrons with my epicyclotron. I didn't. I built the whole thing assuming it was the lat...
by Chris Bradley
Fri Nov 21, 2014 7:49 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Revisiting an old topic - Wall loading
Replies: 11
Views: 6785

Re: Revisiting an old topic - Wall loading

so lets have a look at a typical fusor 40 kv 10 mA with an ion source beam diameter 2cm on target so 1^2 x pi = 3.1412 current = 1.6^17 atoms /s which = 0.5 ^ 17 atoms / s /cm so to go over 10^19 atoms 200 seconds =3.33 minutes hmmm.... but a 10mA fusor has an electron current of 9.83mA and an ion ...
by Chris Bradley
Fri Nov 21, 2014 7:40 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: A new topology for building a low-cost DIY HV power supply ... 30kV/80W for $25.
Replies: 39
Views: 21400

Re: A new topology for building a low-cost DIY HV power supp

I'm pleased to see that there is an interest in building the first supply with this topology to power a conventional fusor. It will be interesting to get some learning from that. In regards evaluating how many inverters you would need for a given power, I think in general you will need to push small...
by Chris Bradley
Sat Nov 15, 2014 11:35 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Why is ignition required for a fusion power plant
Replies: 12
Views: 6662

Re: Why is ignition required for a fusion power plant

FWIW, no need to have a power source of that magnitude for the crank-start. JET cranks its tokamak up by a couple of huge inertia wheels that it spins up over several minutes from mains electricity, then dumps that energy quickly.
by Chris Bradley
Tue Nov 11, 2014 9:43 pm
Forum: Vacuum Technology (& FAQs)
Topic: How to check instruments ground connection relibility?
Replies: 5
Views: 2022

Re: How to check instruments ground connection relibility?

John, I have always thought that if I were to want to set up some earthed points, I would sink two earth points then try to apply a high current low voltage between the two. I would then know the resistance between the two points via earth, so if I then link them in parallel I'd have a connection to...
by Chris Bradley
Tue Nov 11, 2014 9:27 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Why is ignition required for a fusion power plant
Replies: 12
Views: 6662

Re: Why is ignition required for a fusion power plant

1. Beam interactions:- In regards the question of a beam passing through a gas, Preston has provided a sound description. However, it is more dire than that still, because in a gas you have electrons and these sap the beam too. I have written at length on this subject here because this is the very i...
by Chris Bradley
Mon Nov 10, 2014 6:57 am
Forum: Vacuum Technology (& FAQs)
Topic: Please let us know your experience with glass to metal seal
Replies: 33
Views: 11906

Re: Please let us know your experience with glass to metal s

Might be easier to describe what your objective is, than the means you think you need to use to achieve it.
by Chris Bradley
Sat Nov 08, 2014 8:19 pm
Forum: Vacuum Technology (& FAQs)
Topic: Help Identifying this Vacuum Fitting
Replies: 7
Views: 2967

Re: Help Identifying this Vacuum Fitting

Just to cover bases here, such thread couplings may also come as BSP 1/8". BSP is 28 threads/inch, NPT is 27, otherwise all apparently the same until you find they only screw up a couple of turns and leave you wondering what's going on! Perhaps you are unlikely to see BSP in the US, but it exists so...