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by ekribbs
Thu Mar 12, 2009 2:36 am
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 69360

I'm curious what effect reshaping the "nubs" as pictured above might have on the fields. Will changing their intersection to the rear of the coils, and increasing their radius clear them of the wiffleball effect and recirculating particles? The nubs are only a problem where they are. Stea...
by ekribbs
Wed Mar 11, 2009 8:51 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 69360

You must remove the semi-circular loops because: 1) radial outward forces will break them. 2) they provide an electron loss path. 1) Not if they're not the primary supports and are just acting in a lateral support capacity, as shown in the previous post. 2) This is really the only concern. I'm curi...
by ekribbs
Wed Mar 11, 2009 8:07 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 69360

Scupperer's idea here will put the semicircular "nubs" into massive bending due to the 60 Tesla magnetic forces you stated earlier, The "nubs" would break from the bending and the whole assembly would fly apart. 60 Tesla, WB-6 was 1.25 Tesla. Am I correct Tom Ligon? Remove all t...
by ekribbs
Wed Mar 11, 2009 6:12 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 69360

http://www.ehlinger.com/scupperer/wb-7x.png Billy Catringer, Scupperer's idea here will put the semicircular "nubs" into massive bending due to the 60 Tesla magnetic forces you stated earlier, The "nubs" would break from the bending and the whole assembly would fly apart. 60 Tes...
by ekribbs
Tue Mar 10, 2009 6:12 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 69360

A structural design for Polywell with no tension supports

I am submitting a description of my vision of a design which does not have tension supports as requested by Billy Catringer. Sorry, Billy, I have no pictures, so I will do my best to describe my idea. You want six 2 meter magnets in WB-6 configuration. I assume the requirement of no tension supports...
by ekribbs
Thu Mar 05, 2009 8:06 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

You missed the theme of this discussion. We were concerned with the electron losses at the "nubs" that hold the magnet coils together, which as everyone agreed were in tension due to the radially outward magnetic forces. Tom Ligon and I suggested removing the "nubs" to really el...
by ekribbs
Thu Mar 05, 2009 2:33 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

A balloon doesn't need a "cage" to hold it in. The pressure loads the material with simple membrane stresses. A polywell doesn't need a cage either. Given a layup like being discussed in the design topic, the repulsive forces can be taken out with simple tensile loads in the coil backbone...
by ekribbs
Wed Mar 04, 2009 11:06 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

Make that a 9-cylinder radial engine and I'll buy it. There are 5- and 7-cylinder radial engines, but I've never seen 6. The forces on the magnets on all the Polywells I worked with were substantial, but not challenging in an engineering sense. You would not want to hold them together with your han...
by ekribbs
Wed Mar 04, 2009 10:09 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

In all my 27 years of education, I never heard of an "l/d ratio" for strength. A truss tower/standoff can be designed wherein the pipe shear forces are unimportant. If you are working with equipment which is inconvenient for an optimal design, well, God bless you. My suggestions are for t...
by ekribbs
Wed Mar 04, 2009 7:55 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

Never forget the buckling issue with struts in compression. It is a very nonlinear effect often leading to catastrophic mechanical failure. (one more highly non-linear interaction for the full-up model to deal with. What fun!:) ) I don't have a good image of your "cage". What shape is it?...
by ekribbs
Wed Mar 04, 2009 6:55 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

That would tend to make the standoffs shorter and consequently more stiff to resist bending, That is the idea. It is due to the pressure vessel not being optimized for the function required. Yeah. It is a slight complication. As long as there is minimal compression/tension on the feeds that exit th...
by ekribbs
Wed Mar 04, 2009 5:17 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

I would build a tension cage inside the vessel to support the ceramic/metalic stand offs. Then your standoffs need not reach the wall. Of course ultimately an integrated structure is desired. I think COMSOL (sp?) which does integrated physics/mechanics can handle the problem. It is rather pricey - ...
by ekribbs
Wed Mar 04, 2009 4:25 pm
Forum: Theory
Topic: STATEMENT OF OBJECTIVES from RFP
Replies: 120
Views: 34744

From my first read thru the Valencia report, I thought the nubs would have to go. If the coils must be spaced to avoid the funny cusp, I just instinctively felt the nubs must be a loss path. They may be orders of magnitude less so than the old geometry, but I felt they would bleed off high-energy e...
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