Search found 78 matches

by prestonbarrows
Tue Feb 11, 2014 3:33 am
Forum: News
Topic: 2014 Dark Horse Trifecta Year?
Replies: 101
Views: 39077

Re: 2014 Dark Horse Trifecta Year?

... So, although the triple product is an excellent metric, it would seem to me it is useful only if resolution of the down stream issues are believable ... The triple product only says anything about the physics, not the engineering feasibility. It is almost certain that the first few generations ...
by prestonbarrows
Fri Jan 24, 2014 2:16 am
Forum: News
Topic: 10KW LENR demonstrator (new thread)
Replies: 6351
Views: 1133524

Re: 10KW LENR demonstrator (new thread)

What can be asserted without evidence can be dismissed without evidence.

Hitchens' razor
by prestonbarrows
Thu Jan 23, 2014 4:12 am
Forum: News
Topic: 10KW LENR demonstrator (new thread)
Replies: 6351
Views: 1133524

Re: 10KW LENR demonstrator (new thread)

Axil wrote:...
Poe's Law
by prestonbarrows
Tue Jan 14, 2014 1:40 am
Forum: Theory
Topic: A question about vacuum chambers
Replies: 7
Views: 3096

Re: A question about vacuum chambers

I have never had personal experience with anyone using dry helium to backfill. However, helium is a standard tool to check for leaks. It is a small atom that easily squeezes through cracks. It is also generally not found naturally in atmosphere making it a good 'tracer'. So, you bleed bits of He aro...
by prestonbarrows
Tue Jan 14, 2014 1:13 am
Forum: Theory
Topic: A question about vacuum chambers
Replies: 7
Views: 3096

Re: A question about vacuum chambers

... Anyway, IIRC the reason to back fill is to dry out the chamber. ... This is the correct answer. At a molecular level, water, nitrogen, oxygen,and other things stick to most surfaces. You don't notice this every day because this is a very small amount, a few atoms thick. This is called adsorptio...
by prestonbarrows
Sun Jan 12, 2014 5:09 pm
Forum: News
Topic: 20 years away, and always will be
Replies: 137
Views: 27162

Re: 20 years away, and always will be

Yes, you're correct. I was sloppy with the use of the term 'ignition'. It is not strictly required for net gain, Q>1. An IEC style device would never reach ignition (nor would it need to).
by prestonbarrows
Thu Jan 09, 2014 2:07 am
Forum: Implications
Topic: First tier, second tier
Replies: 21
Views: 19588

Re: First tier, second tier

earning how tub-boat asteroids into lunar orbits for the purpose of exploration and mining That *is* wild! And surprising. It implies a lack of confidence in terrestrial sources, including under-sea sources. Maybe the space boys (and girls) will come up with something brilliant (a ore-capacity spac...
by prestonbarrows
Thu Jan 09, 2014 1:16 am
Forum: News
Topic: 20 years away, and always will be
Replies: 137
Views: 27162

Re: 20 years away, and always will be

...Something similar may be true for NiF and others getting government money -- they tell their story to the government, not investors... This is very much the case. 90% of science is obtaining funding. Still... I prefer to think the scientists behind the predictions of breakeven are sincere. These...
by prestonbarrows
Wed Jan 08, 2014 2:52 am
Forum: Implications
Topic: First tier, second tier
Replies: 21
Views: 19588

Re: First tier, second tier

...But quality of metal ores has been in decline for literally thousands of years. ... NASA and private industry are learning how to tug-boat asteroids into lunar orbits for the purpose of exploration and mining. also, lhttp://www.nasa.gov/content/new-nasa-mission-to-help-us-learn-how-to-mine-aster...
by prestonbarrows
Wed Jan 08, 2014 2:02 am
Forum: News
Topic: 20 years away, and always will be
Replies: 137
Views: 27162

Re: 20 years away, and always will be

...when it break-even fusion? There is a minimum density, temperature, and confinement time needed for ignition (Q>=1) for a given reaction. TFTR has demonstrated these points independently, but never simultaneously. JET has demonstrated Q=.75 with actual DT at about 15MW. JT-60 has demonstrated co...
by prestonbarrows
Tue Jan 07, 2014 3:35 am
Forum: News
Topic: 20 years away, and always will be
Replies: 137
Views: 27162

Re: 20 years away, and always will be

Image

Image
by prestonbarrows
Wed Jan 01, 2014 6:53 pm
Forum: Theory
Topic: particle simulation using fast multiple method
Replies: 45
Views: 15553

Re: particle simulation using fast multiple method

Here are the most basic tests for confirming your B-field is working correctly with particles. Define a uniform B-field and send off a single particle with a known velocity. If everything is correct, you will get a circular orbit. Check for -Constant radius -Plane of orbit perpendicular to both fiel...
by prestonbarrows
Wed Jan 01, 2014 1:11 am
Forum: Theory
Topic: particle simulation using fast multiple method
Replies: 45
Views: 15553

Re: particle simulation using fast multiple method

i'm working on testing the magnetic fields now. not nearly as easy to verify as electric fields... I mean that if you get your magnetic fields working, run something simple like a cylindrical solenoid. Let us know the dimensions etc. and I'll run the same problem on established modeling software so...
by prestonbarrows
Tue Dec 31, 2013 3:14 am
Forum: Theory
Topic: particle simulation using fast multiple method
Replies: 45
Views: 15553

Re: particle simulation using fast multiple method

If you wanted to do some trivial magnetic geometries, I could benchmark your results against some established software.
by prestonbarrows
Tue Dec 31, 2013 2:04 am
Forum: Theory
Topic: plasma density in magnetic bottle
Replies: 12
Views: 7534

Re: plasma density in magnetic bottle

EDIT: apparently this forum doesn't parse latex, see attached for compiled version Plasma resistivity is given fundamentally by \vec{E} + \vec{V} X \vec{B}= \eta*\vec{j} where E is the vector electric field, V is the velocity vector, B is the vector electric field, eta is the resistivity, and j is ...