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Re: Superconducting magnifier
From: Ted[SMTP:tedric-at-generation-dot-net]
Sent: Sunday, November 09, 1997 5:56 AM
To: Tesla List
Subject: Re: Superconducting magnifier
>From: DamDeName-at-aol-dot-com[SMTP:DamDeName-at-aol-dot-com]
>Sent: Wednesday, November 05, 1997 11:23 PM
>To: tesla-at-pupman-dot-com
>Subject: Re: Superconducting magnifier
>
>In a message dated 97-11-03 00:20:30 EST, you write:
>
>
> From: Ted[SMTP:tedric-at-generation-dot-net]
> Sent: Sunday, November 02, 1997 4:30 PM
> To: tesla-at-pupman-dot-com
> Subject: Superconducting magnifier
>
> Hi,
>
> I am new to this list, and would like to know is there any coiler lives
> around Montreal?
> Also, what about building a superconducting magnifier? I have this thought
> for very long time, but if someone proposed it already, please don't flame
> me tough, instead tell me who that it or where I can find more information
> (check Geogre Trinkaus's Tesla The Lost Invention on p.10) about it.
>
> With today's superconductor, the price is dropping and the critical
> temperature is rising to dry ice range(and over). Using film deposit
> technology, no more labour intensive winding will be nesecsary, also higher
> field density can be achieved. So what do you think about it?
>
> The primary and secondary can be insulated in liquid nitrogen, the
> evaporated nitrogen can be used to quench spark gaps and lowers its
> temperature. Liquid nitrogen costs pratically nothing, and will last for
> days in a thermos. (I believe) Almost infinite amount of current can float
> in the secondany with zero impedance as long as it is tuned. Mind you,
> superconductor does have its limits: Critical current per unit area and
> critical magnetic field (as I remember). Forunately, they are still much
> higher than conventional conductor. Just take five minutes to think about
> the possiblity! True PRACTICAL superconductor was not available to Tesla,
> but we now have the technology, so grasp the opportunity! Maybe YOU will be
> the one that brings tesla coiling in to a new era!
>
> One more thing: According to Tesla, rarefied gas shows excellent
> conductivity for high frequency electrical current, maybe even better than
> copper! Noble gases are even better. Why not evacuated the air in the
> primary then fill the tube with helium (and seal it afterward, of coarse). A
> (big) tank of compressed helium cost as little as $21 CAD or $15 USD, so why
> not give it a try and share the results with us.
>
>
> Ted
>
> Hi Ted ,
>
> I too have tinkered mentally in this area -- the main problem
>i came up with had to do with the question of --- what would the
>bandwidth of the system be as the Xl/r approaches 0 ???
> aside from the other problems that others on the list have
>pointed out --------Since i dont have a hydrogen maser to control
>the frequency i kinda shelved the idea :>) ---
>
> Re: helium --- i'm not sure but i thiMk helium is rather stubborn
>when it comes to learning about ionization & conducting current--
>dumb He :>) ----on the mention of rarefied gasses ---
>air is an insulator --- it requires many KV to arc an inch (2.54 cm)
>(see my earlier post on spark gap voltages ) if one lowers (rareifies)
>the atmospheric pressure --- a kilovolt can arc *feet* ---- using
>helium with air renders the medium less dense & allows hf displays
>to take place --- ie. plasma globes ----
> i have considered the possibilities of using a plasma tube as
>source of EM flux for high energy pulse generation i dunno about
>the problems there ---- perhaps someone "out there " has an input ??
>
> Keep thinkin' & werkin ------------ it's fun even ifin it don' werk :>)
>
>haveatit
> Sandy
Sandy,
Although I said zero impedance, in fact, superconductor does have DC
resistance. People say it has no resistance because it is negligible (10^-25
ohm/cm or m?). Also, as r approches 0, take the derivative of the equation
to get the answer.
Also, I cannot agree on what you said about helium, are you saying that
Tesla is wrong? I believe by checking
http://www.eskimo-dot-com/~billb/tesla/heli1(one, not L).txt, you will have a
different idea about the subject. The only thing that I am concerned is:
"Will the gas inside the copper tube be ionized?" I don't think so, but
according to Richard Hull's book (The Tesla Coil Builder's Guide to The
Colorado Springs Notes of Nikola Tesla) in page A-33, current will flow
inside the surface rim of the pipe as well as on the surface. Well, if it
true, then the gas will be ionized even inside a metal structure. Am I wrong?
Ted