Search found 261 matches
- Fri Feb 06, 2009 8:12 pm
- Forum: Theory
- Topic: Recirculation revisited
- Replies: 37
- Views: 26384
I should have gone ahead and quoted him: there will probably be about an order of magnitude density ratio between the anode region and the central plasma n/n_0 ~ 0.1. The ratio would probably be lowest for cases with a large volume of field-free plasma, narrow anode gaps and low neutral gas pressure...
- Fri Feb 06, 2009 6:45 am
- Forum: Theory
- Topic: Recirculation revisited
- Replies: 37
- Views: 26384
That seems like a decent treatment to me, that business with mc^2 is very clever. It's counterintuitive that the space-charge voltage is worse than inversely proportional to rho_e. But I think I see why: the area of the (point) cusp goes with 1/B , but the electron density goes with B^2, assuming be...
- Wed Feb 04, 2009 8:42 pm
- Forum: Theory
- Topic: Recirculation revisited
- Replies: 37
- Views: 26384
I have explained why I don't expect any recycling, and nobody has presented a counter-model in any helpful degree of detail. If you can do that, great! Ok, let me see if we are on the same page: http://x87.xanga.com/5238535718108232272013/m183200974.jpg The graph is in radius from the center of the...
- Wed Feb 04, 2009 2:34 am
- Forum: Theory
- Topic: Undergrad Research
- Replies: 15
- Views: 11752
Yeah, the trouble is that if the plasma actually shoves the magnetic field lines back at high beta, then they might get displaced so that they impact the toroidal electrodes. The best part is that since the permanent magnets can be run in steady state :D it might be possible to burn out the backgrou...
- Sun Feb 01, 2009 6:50 pm
- Forum: Theory
- Topic: Toroidal cusp -similar to polywell
- Replies: 0
- Views: 1966
Toroidal cusp -similar to polywell
http://www.jetpletters.ac.ru/ps/1535/article_23489.pdf This is a nice summary of an electrostatically-plugged cusp machine (albeit a toroidal cusp.) It seems like it would make a nice primer for polywell physics. Page 2: "The escape of the electrons from the system along the magnetic field is blocke...
- Sun Feb 01, 2009 3:35 pm
- Forum: Theory
- Topic: STATEMENT OF OBJECTIVES from RFP
- Replies: 120
- Views: 58806
- Sun Feb 01, 2009 3:33 pm
- Forum: Theory
- Topic: Undergrad Research
- Replies: 15
- Views: 11752
I'm also an undergrad, wanting to do some polywell-related research. I don't think I have the resources to do an actual experiment at my school, but I think I might end up doing a programming/simulation project. I have an idea about trying to determine collective effects using a smaller number of pa...
- Fri Dec 19, 2008 12:34 am
- Forum: News
- Topic: IEC Fusion 2008 Conference - Kyoto
- Replies: 7
- Views: 4410
- Wed Dec 17, 2008 6:50 pm
- Forum: News
- Topic: "The verdict is positive"
- Replies: 99
- Views: 56591
- Wed Dec 17, 2008 2:28 pm
- Forum: Theory
- Topic: 1977 Review by Haines
- Replies: 29
- Views: 13859
- Tue Dec 16, 2008 3:25 pm
- Forum: Theory
- Topic: 1977 Review by Haines
- Replies: 29
- Views: 13859
Ok, so you are saying that the sheath thickness determines the minimum size that the cusp loss hole can be, be it line or point? (And that the sheath thickness is driven to be about the hybrid Larmor for some reason or other.) I buy that. But won't the plasma expand until the sheath is very close to...
- Sun Dec 14, 2008 10:31 pm
- Forum: Theory
- Topic: 1977 Review by Haines
- Replies: 29
- Views: 13859
- Sun Dec 14, 2008 1:17 am
- Forum: Theory
- Topic: Shape of Wiffleball
- Replies: 16
- Views: 9980
To continue with the questions about the shape of the plasma, what I'd like to do (or see someone do, anyrate) is figure out what the flux surfaces look like that bound the plasma in a polywell. Despite the fact that the coil cans are supposed to be conformal, there must be some flux surfaces which ...
- Sat Dec 13, 2008 4:30 pm
- Forum: News
- Topic: Potential Tokamak Breakthrough
- Replies: 11
- Views: 5961
- Fri Dec 12, 2008 2:24 pm
- Forum: Theory
- Topic: Electron interactions with the magnetic field
- Replies: 56
- Views: 25349
MSimon: is there any way we could make a sticky at the top of the "theory" forum to house links to relevant documents, or possibly citations of documents that are not available electronically? DW: that's what you woul think. Apparently, nobody actually tried Bussard's exact idea, and we don't know e...