Search found 825 matches

by drmike
Sat Jan 10, 2009 1:56 pm
Forum: General
Topic: Global Warming Concensus Broken
Replies: 424
Views: 57152

I don't think it takes much to make scientists political - they all have opinions! Non scientists should be careful what they ask for though. A lot of the financial mess was caused by good scientists doing proper math with wrong assumptions. The people asking for the work did not fully understand th...
by drmike
Sat Jan 03, 2009 2:08 am
Forum: Theory
Topic: Why 10-25 times net power?
Replies: 114
Views: 26374

Thanks for that pointer Mike, that's a great proof of principle they have. I'm not so sure it will apply to something like Polywell, but certainly the basic physics is all the same. They can suck energy out repetitively as the beam goes around, I'd think Polywell wants to do it in one pass. Pretty i...
by drmike
Sat Jan 03, 2009 2:01 am
Forum: Design
Topic: Insulators in a Vacuum
Replies: 1
Views: 2849

I wonder if a "leaky insulator" would help prevent too much charge build up.
If you have a resistance of 100 MegOhm/square the 2 MV stand off might be
set up to leak .1 to 1 % of the total current. That would help keep the field
uniform over the whole insulator.
by drmike
Tue Dec 30, 2008 9:55 pm
Forum: Design
Topic: Mechanical Design: Open FEM
Replies: 1
Views: 2511

The pointer to the free software is a good one to save. I've seen most
of that stuff mentioned before, but never all in one place!
by drmike
Tue Dec 30, 2008 3:45 am
Forum: Design
Topic: 3 contracts, is the ion gun for WB-7
Replies: 1
Views: 1581

The instrumentation is for plasma density in more places. The ion gun can be a part of that because it is a probe for magnetic fields as well as useful for estimating density and double checking cross sections of various interactions. It's a nice tool to have in your belt, and they are lucky to be g...
by drmike
Sat Dec 27, 2008 4:50 pm
Forum: Theory
Topic: Free Plasma Physics Book
Replies: 5
Views: 2116

Got it. It looks like a great introduction to plasmas and fusion power and it is only 2 years old, so it has a lot of references to ITER and similar experiments. Lite on the math from my perspective, but that's a good thing for most people trying to figure this out for the first time. The first part...
by drmike
Wed Dec 24, 2008 3:13 pm
Forum: Fund-Raising
Topic: change.gov -> my vision for america involves 'fusion'
Replies: 2
Views: 4902

Howdy Vernes,

I put one up about fusion. It'll be interesting to see if fusion gets any attention over the next few years. I think it will do better than the last 20 simply because science in general is going to get some attention.
by drmike
Sun Dec 21, 2008 4:05 am
Forum: News
Topic: Building an Open Source Bussard Reactor
Replies: 27
Views: 9893

Looks like fun! I wonder how that plastic will hold up under vacuum, and just how he
intends to make a vacuum. But at least he's trying to build something!
by drmike
Fri Dec 19, 2008 6:44 pm
Forum: News
Topic: MTF Illustration
Replies: 64
Views: 35991

You only need diagnostics if it _doesn't_ work. If it works, then you get neutrons. Given the amount of gas and number of neutrons detected you can figure out the compression ratio of the shock. These guys aren't looking at this as a physics experiment, they are looking at it like a business experim...
by drmike
Thu Dec 18, 2008 6:18 pm
Forum: Design
Topic: HV Power Supplies
Replies: 7
Views: 2732

Well, crap, I saw PNL and thought of the labs in Washington. I rode my bike to work in Middleton last year - but now I'm on the east side of town!

I wish them luck. I suspect they are going to have a hard time keeping
things going, and I sure hope they are successful!
by drmike
Thu Dec 18, 2008 3:39 am
Forum: Theory
Topic: Circumferential scattering and edge annealing.
Replies: 19
Views: 4932

chrismb - you are thinking about individual particle motion where the forces are maximum and speeds are minimal. If it's a smooth potential and the particles are far apart, that's ok, but at high density I think the idea of "slow moving ions" just isn't going to happen. You also have the fact that e...
by drmike
Thu Dec 18, 2008 3:31 am
Forum: Design
Topic: HV Power Supplies
Replies: 7
Views: 2732

Nice. But I can't afford it, so I have to build it myself 8)
by drmike
Wed Dec 17, 2008 6:23 pm
Forum: Theory
Topic: What if there were no electrons?
Replies: 42
Views: 8944

Dan, This is a great way to learn physics. There are two parts to your question - one is about the force between particles and the other is about what happens when you get a lot of particles (in this case a shell). The electric force is huge. I vaguely remember a homework problem where we had to com...
by drmike
Wed Dec 17, 2008 4:51 pm
Forum: News
Topic: "The verdict is positive"
Replies: 99
Views: 31847

So when can I read the report? Now that it has passed review, is it public
domain, company propriatary, or classified? I can understand keeping it
private for patent purposes, but it'd be great to be able to read it.
by drmike
Mon Dec 15, 2008 2:55 am
Forum: Theory
Topic: Total ion flux in a Polywell - disruption to magnetic field?
Replies: 38
Views: 11680

The ion currents are mostly radial, so the net current is pretty much zero. Near the MaGrid the velocity is zero, and near the center the sum of all velocities is zero, so the current is zero at those points. In between there may be a few oscillations, but the net current flow is pretty small. At le...