Search found 31 matches

by eros
Sat Nov 15, 2008 1:53 pm
Forum: Design
Topic: Heat exchangers
Replies: 48
Views: 12561

To get YBCO up to the Teslas we need (would like) YBCO would need to be cooled to the same temp (roughly) as MgB. http://aries.ucsd.edu/ARIES/MEETINGS/0003/BROMBERG/sld006.htm I see still quite lot of amperes at 77K. Anyway it needs lees cooling than MgB2. And mfg capacity is to the point where km ...
by eros
Sat Nov 15, 2008 8:53 am
Forum: Design
Topic: Heat exchangers
Replies: 48
Views: 12561

Eros, MgB is a better bet. IMO. Lower costs - not so brittle. And if it is made with B11 its resistance to neutron flux is pretty good. Yes, MgB2 is best bet, but supply is limited still. And it needs He or liquid H2 cooling LN2 is not enough. Maufacturers make YBCO rings for magnet bearings. Some ...
by eros
Fri Nov 14, 2008 5:28 pm
Forum: Design
Topic: Heat exchangers
Replies: 48
Views: 12561

V Temperature (K) Resistivity x 10e-8 ým X res. 20 0.0028 40 0.0239 60 0.0971 80 0.215 293 1.678 298 1.712 Hmm, if copper 0.017ohm/mm² drops 0.0017 (~70K) then power needs drops 10x. 20K drops power needs ~600x. So if 1m research machine with 30cm thick coils cooled to 20K (liquid hydrogen) it coil...
by eros
Fri Nov 14, 2008 4:44 pm
Forum: Design
Topic: A really powerful design tool for free
Replies: 8
Views: 4633

Re: BRL-CAD

Just use BRL-CAD . It was developed and used in production by the U.S. military for more than 20 years, now it is open-sourced. It is powerful BRL-cad have very ancient scetching tools. I have drop three years ago idea to put qcad inside BRL-cad to do 2D scetch then extrude/revolve/etc 2D to 3D. No...
by eros
Wed Nov 12, 2008 9:12 pm
Forum: Design
Topic: Effects of high energy alpha on materials
Replies: 30
Views: 9509

Re: Wiffle ball effect on Alpha's

You mean that force depends at charge and alphas charge is two times electron. So force is double, but mass 3600x so accelration comes 1800 times weeker than electrons. I mean't acceleration all around, since it's acceleration which is directly related to the kinematics. a=F/m, and F is proportiona...
by eros
Wed Nov 12, 2008 8:39 pm
Forum: Design
Topic: Q&A : Major hurdles to overcome for Polywell Reactors
Replies: 50
Views: 18506

CNT is said to be a far better conductor than Cu. Are there any tests for CNT magnets? I can't find yet, but this says -50% resistivity: http://www.springerlink.com/content/j2ucrg72gwqd97e3/ However price must be high. Nanotubes are quite expensive. MgB2 is quite cheap.. in 10m machine -50% resisti...
by eros
Tue Nov 11, 2008 7:49 pm
Forum: Design
Topic: Q&A : Major hurdles to overcome for Polywell Reactors
Replies: 50
Views: 18506

Coil loss grows linearly with size. Power out goes up at some higher power. Break even will happen when the size is big enough. I agree that, but questions is how big it needs to be and how much energy it consumes in coils at breakeven. Do calculation that I don't need to brother anymore are my cal...
by eros
Tue Nov 11, 2008 7:16 pm
Forum: Design
Topic: WB6 Coil question
Replies: 40
Views: 13362

So you make the reactor bigger. Coil power goes up linearly with size. Output power goes up as the 7th power of linear size. I make calculation sheet for that purpose. Yes if go Big enough breakeven is posible. But it found at 2.5km core and 250m thick coils if use 10% thickness rule. Breakeven com...
by eros
Tue Nov 11, 2008 6:50 pm
Forum: Design
Topic: Effects of high energy alpha on materials
Replies: 30
Views: 9509

Re: Wiffle ball effect on Alpha's

The acceleration caused by the fields is proportional to the charge, but inversely proportional to the mass. The alphas are about 3600 times as massive as the electrons, so the forces on them are about 1800 times weaker than on the electrons. So the alphas won't be affected much by the magrid. You ...
by eros
Tue Nov 11, 2008 9:40 am
Forum: Design
Topic: WB6 Coil question
Replies: 40
Views: 13362

Tony, If we were to build net power deuterium-burning machines using copper magnets, magnet power would still be a major consideration. You might still be able to reach net power by some profitable margin, but ohmic magnet heating will never be trivial in copper. Dropping resistance dramatically us...
by eros
Mon Nov 10, 2008 11:23 pm
Forum: Design
Topic: Alpha collector geometry idea...
Replies: 42
Views: 19838

How about magnetic fields. Dos they bend alfas path and how much is effect?

Can field catch alfas circulating wider and make circulation to collide magnets surface?

Maybe talked thing but not yet find that..
by eros
Mon Nov 10, 2008 9:02 pm
Forum: Design
Topic: Q&A : Major hurdles to overcome for Polywell Reactors
Replies: 50
Views: 18506

Yep ! Bitter magnets are a great design. Cant believe nobody has mentioned them yet. Will be great in a test reactor with CU and liquid cooling. Sadly very hard to apply to Super Conductors. You can't owercome copper resistivy. That means you need enormous power to drive magnets. Breakeven ~imposib...
by eros
Mon Nov 10, 2008 8:25 pm
Forum: Design
Topic: Throttling and idling....
Replies: 19
Views: 6626

Superconducting magnets are "costly" to throtle fast. It is still posible at say day and night / hourly operations. We have energy markets here too, you'll sell energy productions hours and price come from market. That kvantitave production level and many BFR give good energy regulation. Magnets fie...
by eros
Sun Nov 09, 2008 8:20 pm
Forum: Design
Topic: Non-Conductive Can?
Replies: 12
Views: 3660

For connections between coils it can go either way. You might even want to mount each coil separately so the region between them is free to allow currents to flow with no obstructions. It'd be an interesting comparison to study. I think electrons recirculate back or something. Coil support needs to...
by eros
Sun Nov 09, 2008 8:03 pm
Forum: Design
Topic: Copper coil reactor imposible?
Replies: 2
Views: 2018

I don't quite see how you computed the coil power. I would think the coil power scales linearly with radius where the power generated scales as r^3. Check out the papers here: I used B=4pii * 10^-7 * NI / L that gives needed "ampere turns" then calculate coil crossection area, divide at N -> got on...