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Re: Superconducting magnifier
From: Robert W. Stephens [SMTP:rwstephens-at-headwaters-dot-com]
Sent: Tuesday, November 11, 1997 1:08 PM
To: Tesla List
Subject: Re: Superconducting magnifier
> To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
> Subject: Re: Superconducting magnifier
> Date: Mon, 10 Nov 1997 22:35:06 -0600
> From: Tesla List <tesla-at-pupman-dot-com>
>
> From: Ted[SMTP:tedric-at-generation-dot-net]
> Sent: Monday, November 10, 1997 2:23 PM
> To: Tesla List
> Subject: Re: Superconducting magnifier
>
> Robert,
>
> I guess you are right. I have not checked any references, but did ask three
> persons in my college's chemistry department. Althought my chemistry teacher
> said that liquid oxygen is an insulator, the rest both agreed it can be a
> conductor. If possible, please provide more information on this subject,
> maybe this can be useful in the future. Thanks in advance.
>
>
> Ted
>
>
> >From: Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
> >Reply To: rwstephens-at-headwaters-dot-com
> >Sent: Sunday, November 09, 1997 8:05 PM
> >To: Tesla List
> >Subject: Re: Superconducting magnifier
> >
> >>
> >> From: Ted[SMTP:tedric-at-generation-dot-net]
> >> Sent: Sunday, November 09, 1997 3:19 AM
> >> To: Tesla List
> >> Subject: Re: Superconducting magnifier
> >>
> >> >From: Jim Lux[SMTP:jimlux-at-earthlink-dot-net]
> >> >Sent: Tuesday, November 04, 1997 10:13 AM
> >> >To: Tesla List
> >> >Subject: Re: Superconducting magnifier
> > <snip>
> >
> >Ted wrote:
> >
> >> Right now, I am pondering over this: "Liquid oxygen is magnetic and is an
> >> insulator (no eddy current). Will using liquid oxygen as core material
> >> improve the coupling? And what about using an oudin coil to power an extra
> >> coil?"
> >>
> >>
> >> Ted
> >
> >Ted,
> >
> >My memory tells me that LOX is a darned good conductor of
> >electricity.
> >
> >rwstephens
> >
> >
Ted,
If you apparently have access to a college chem dept and probably
some sort of library you'd be in much better shape than me to
research the conductivities of cryogenic liquids. My cryo experience
is practical stuff learned while hands-on with closed cycle helium
refrigerators (10-15K) and LN2 (78K) while cooling the various front ends of
my observatory's radio astronomy receivers. At the time I had access to some
good books on the subject while with the NRC. I am no longer in such a
position, but I do still have a near state-of-the-art closed cycle Helium cooled
HEMT radioastronomy receiver available for sale that specs under 5 Kelvins
noise temp and has ruler flat 30 db gain across 1300-1800 MHz driven by a CTI
model 350 cryostat if anyone is interested. You can get one of these
custom built for you at NRAO for ~$250-500K US.
You might try calling Linde or Liquid Carbonic in the yellow pages.
They may be able to supply product datasheets at the very least
covering liquified gasses and their properties. Hope this helps.
rwstephens