I have seen measurements of RF cavity resonators made out of both type I and type II superconductors. Of course, the cavities made with type 1 were better, but none were infinite Q as you might initially suspect if you believed the resistance was zero above DC. In fact, in the low GHz range, the performance of these cavities was only about 3x better than copper at the same temperature. Superconductor losses go up with frequency. If that were not true, they would optically appear to be perfectly reflecting and anyone who has seen a superconducting type II material knows that doesn't happen. Type I materials in the SC state just look like they did outside of SC state in the optical (like ordinary metals).
Bob Higgins -----Original Message----- From: Michele Comitini [mailto:[email protected]] Sent: Wednesday, October 19, 2011 6:07 PM To: [email protected] Subject: Re: [Vo]:S-C currents not DC? RF cavity is used in particle accelerators. Those things are AC yet they dissipate very little, if I recall correctly a stationary RF in one of those lasts for months. They spend more energy for keeping things cool. http://en.wikipedia.org/wiki/Superconducting_Radio_Frequency mic 2011/10/19 Higgins Bob-CBH003 <[email protected]>: > Say that initially the superconductor was brought into its SC state not in > the presence of magnetic fields. At that time there are nominally no > supercurrents. As you bring the SC into the presence of a magnet a > supercurrent must form that previously did not exist to prevent penetration > of the magnetic field into the superconductor. This is not a DC > supercurrent because it has not existed in steady state for all time. > Initially there will be some loss in the supercurrent because there are > components that are not DC. At least that's my understanding. I asked a > guy at CERN about this in how they bring up their strong supercurrent in > their superconducting electromagnets. It is not a simple process. > > ________________________________ > > From: Wm. Scott Smith [mailto:[email protected]] > Sent: Wednesday, October 19, 2011 4:28 PM > To: [email protected] > Subject: [Vo]:S-C currents not DC? > > > > How are S-C currents not DC? > > ________________________________ > > To: [email protected] > Subject: Re: [Vo]:quantum levitation > From: [email protected] > Date: Wed, 19 Oct 2011 16:19:59 -0400 > > thanks for the info > > -----Original Message----- > From: Higgins Bob-CBH003 <[email protected]> > To: vortex-l <[email protected]> > Sent: Wed, Oct 19, 2011 8:48 am > Subject: RE: [Vo]:quantum levitation > > Note that superconductors have zero resistance only for DC. At all > frequencies > > above DC, the resistance is finite and there is penetration. Consider also > that > > true DC extends from time -infinity to +infinity as a constant. Moving the > > superconductor in a magnetic field does create resistance because the > > supercurrents are not DC. > > > > Bob Higgins > > > > -----Original Message----- > > From: Harry Veeder [mailto:[email protected]] > > Sent: Wednesday, October 19, 2011 12:27 PM > > To: [email protected] > > Subject: Re: [Vo]:quantum levitation > > > > Is it posible the RF signal is warming the superconductor just above > > the critical temperature so that it drops? > > > > > > Harry > > > > On Tue, Oct 18, 2011 at 11:48 PM, <[email protected]> wrote: > >> A new understanding of flux pinning is the most important relation in 100 > >> years. The magnet floats on the superconductor. Apply an RF field of 10 > >> mega hertz to a small disk and the magnet drops. That what I saw, so >> what > >> you say. Now we know how energy is released. Energy is pinned with the > >> atom by the same mechanism, discontinuities. Where are >> the discontinuities > >> in the atom, here there are below. > >> >> http://academic.research.microsoft.com/Publication/10710753/the-elastic-limit-of-space-and-the-quantum-condition > >> What can you predict knowing the observed release condition? Try the >> energy > >> levels of the hydrogen atom, the intensity of spectral emission, > >> the distribution of electrons in the atom, and the frequency and energy of > >> the photon. see below > >> >> http://academic.research.microsoft.com/Publication/10755558/the-control-of-the-natural-forces > >> If you are so bright, where is your peer reviewed paper. Here it is >> below. > >> http://www.sciencedirect.com/science/article/pii/S1875389211006092 > >> > >> An understating of flux pinning and flux release has the potential > >> to transform the study of physics and our society. That my story > >> and I am sticking to it, no matter what Jones says. > >> Frank Znidarsic > >> > >> > >> -----Original Message----- > >> From: fznidarsic <[email protected]> > >> To: vortex-l <[email protected]> > >> Sent: Tue, Oct 18, 2011 7:20 pm > >> Subject: Re: [Vo]:quantum levitation > >> > >> > >> All this talk of pinning is just fine, but all of this is nicely predicted > >> by the basic laws of electrical induction and the zero resistivity offered > >> by a superconductor, you would expect repulsion or attraction to occur. > >> > >> No it is not. This flux pinning thing is a big deal. The same mechanism > >> accounts for the pinning of flux in a superconductor accounts for the >> energy > >> levels of the atom. > >> A solution that includes both provides for a classical foundation for > >> quantum physics. > >> Flux is pinned in the nucleus too. An understanding of the > >> release mechanism provides for a new understanding of the cold fusion > >> reaction. > >> Flux is pinned at discontinuities. It is shook free by a vibration at a > >> dimensional frequency of 1,094,000 meters/second. Thats it. > >> I did the experiment with the superconductor, Horace now has it. > >> > >> > >> Frank Znidarsic > >> > >> > >
