Re: superconducting LC tank circuit?

srp@xxxxxxxxxxxx wrote:
On 27 f?v, 13:48, "Nomen Lapetos" <nos...@xxxxxxxxxx> wrote:
<s...@xxxxxxxxxxxx> wrote in message

news:1172598812.789190.101460@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On 27 f?v, 01:42, "Bill Bowden" <wrongaddr...@xxxxxxx> wrote:

I have heard a resonant tank circuit (combination of inductor and
capacitor) has been assembled from superconducting materials and
sustained oscillation for a long time without any energy loss.

I can't find much on the web and wondered if anyone has a link to the
details (frequency of oscillation, energy storage, and time the
circuit has run without much energy loss, etc.).

Thanks,

-Bill

You are not likely to find much on LC oscillators.

But this is entirely logical

Even in a conventional LC oscillator, there would be no loss
if the wire did not heat up causing the only loss possible.

If only marginal heating occurs in superconducting material
then it is very possible that the loss would be so slow as
to be considered infinitesimal.

no there is EM radiation from the L, energy loss. You would have to enclose
the L in a silver lined shielded case, and this would have losses small but
there.

There is no detectable EM radiations from the L despite popular
belief. Larmor and Lienard's theory was proved wrong way back in
the 1930.

Beats me why this belief is still lingering on.

I gave a correct reference.

Andr? Michaud

No shielding is required

Then how do small loop antennas work?

A small loop antenna is usually a single turn inductor with a
circumference less than 1/10 wavelength and a resonating capacitor,
i.e. an LC tank circuit.

--
Jim Pennino

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Relevant Pages

  • Re: superconducting LC tank circuit?
    ... sustained oscillation for a long time without any energy loss. ... circumference less than 1/10 wavelength and a resonating capacitor, ...
    (sci.physics)
  • Re: superconducting LC tank circuit?
    ... sustained oscillation for a long time without any energy loss. ... I'm saying the L in a LC tank circuit radiates. ...
    (sci.physics)
  • Re: superconducting LC tank circuit?
    ... sustained oscillation for a long time without any energy loss. ... circumference less than 1/10 wavelength and a resonating capacitor, ...
    (sci.physics)
  • Re: superconducting LC tank circuit?
    ... sustained oscillation for a long time without any energy loss. ... I'm saying the L in a LC tank circuit radiates. ...
    (sci.physics)
  • Re: superconducting LC tank circuit?
    ... sustained oscillation for a long time without any energy loss. ... circumference less than 1/10 wavelength and a resonating capacitor, ...
    (sci.physics)