Pure copper wire

[Ian Stirling]

Ken Smith <kensmith@violet.rahul.net> wrote:

In article <Z7Elc.9726$fE.4394@fed1read02>,
Richard Henry <rphenry@home.com> wrote:

"Ken Smith" <kensmith@violet.rahul.net> wrote in message
news:c76djd$oqv$1@blue.rahul.net...

Does anyone know where I can find some 99.9999% pure copper wire?


From audio component freaks?

I doubt it; They've mostly got ordinary copper wire in a fancy jacket that
works like a lens to make the copper look better. Besides I need #22 they
all use 14 or heavier.

Might foil do?
Might be easier to make it pure than wire, as you arn't trying to
pull it through a die.

Is this for a proton precession magnetometer?

Why can't you calibrate the error out, or are you trying to measure
the properties of the coil, not the external field?

 

[John Larkin]

On Tue, 4 May 2004 15:06:23 +0000 (UTC), kensmith@violet.rahul.net
(Ken Smith) wrote:

In article <cf4e90p6g5q4ia9qgc7c3b74or6mbuluip@4ax.com>,
John Larkin <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote:
On Mon, 3 May 2004 21:29:17 +0000 (UTC), kensmith@violet.rahul.net
(Ken Smith) wrote:


Does anyone know where I can find some 99.9999% pure copper wire?

I need some pure #22 gauge wire to wind some very non-magnetic coils for
some experiments.
--

Copper is diamagnetic, so its presence will distort a magnetic field.

Yes, if you can find copper that is clean enough. All of the copper I've
found has a paramagnetic property.

This is a problem for the RF coils in NMR systems, where they'd like
their fields to be uniform to a few parts in 1e10. People sometimes
plate copper electrodes with mysterious stuff to make it closer to
magnetically neutral.

Yes and there is no mysterious coating that lowers mu hence the need to
find some clean wire.


Some audio people will claim to sell you wire that's "five nines" or
"seven nines" but they mostly buy Belden and lie.

How about: not "they mostly" but rather "every doggone one of them"

They stop returning phone calls as soon as the fact that we need #22 that
is clean and can tell if it isn't comes up.


--

These people may have something...

http://www.calfinewire.com/index.asp


John

 

[Ken Smith]

In article <8oPlc.113$B32.22@newsfe5-gui.server.ntli.net>,
Roger Hamlett <rogerspamignored@ttelmah.demon.co.uk> wrote:
[...]

It was harder to find somebody who could reduce the wire to the required
diameter, while meeting the purity requirements, than finding the pure
'feedstock' in the first place...

We have used an acid bath to remove a little of the diameter and thus the
debris in the past. We may have to do that this time.

--
--
kensmith@rahul.net forging knowledge

 

[Walter Harley]

"Mike" <mike@nospam.com> wrote in message
news:y6399vwaqamt.wha3oelb3nw4.dlg@40tude.net...

No! How can you say such a thing!?! Any audiophile can clearly hear the
difference between four-nines and five-nines - it makes the soundstage
dramatically more palpable, and vastly increases presence, expansiveness,
and promptness. Why, just this morning, I was noticing the deictic
dejecture and holocryptic palladian borborygm emanating from my stereo. It
was somniloquacious. Thank God for $100 per foot five-nines copper.

Absolutely! Nothing really brings out the hidden detail in grunge,
garage-rock, and lo-fi like superpure speaker wire. And the realism I get
when listening to sampled, synthesized, heavily-processed electronica...
well, it's just like being there. Wherever "there" was, I mean.

But for me, the thing that made all the difference was when I added the
special power conditioner. It looks just like a heat pump - you know,
cylinder a couple of feet tall and wide, fins on the side, hoses - but it
actually takes each individual electron, laser-sorts it, cryogenically
aligns its spin and corrects quantum deviations, and then sends it directly
to a dedicated outlet for the hifi. I never realized before that how much
of what I was hearing was just resonances from other stereos in the
neighborhood.

Now if I could just get the carpet-cleaning truck in my neighbor's driveway
to turn off, I'd really have a pleasant listening experience.

 

[Martin Riddle]

Well he did say 99.9999% copper.

the wire, it will be VERY expensive.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Ken Smith]

In article <9IPlc.39754$Y%6.5370985@wards.force9.net>,
Ian Stirling <root@mauve.demon.co.uk> wrote:
[....]

Might foil do?

Hummmm..... No. There would be too much eddy current in the foil. In
larger coils we do as suggested in Mr. Berry's patent and use wire rope to
wind the coil.

[....]

Is this for a proton precession magnetometer?

Yup.

Why can't you calibrate the error out, or are you trying to measure
the properties of the coil, not the external field?

Since the copper is not evenly distributed, the effect varies with angle.
Since we don't know the angle, we can't compensate perfectly for the
varying effect.


--
--
kensmith@rahul.net forging knowledge

 

[Spehro Pefhany]

On Tue, 04 May 2004 22:43:23 GMT, the renowned "Martin Riddle"
<martinriddle@hotmail.com> wrote:

(>> the wire, it will be VERY expensive.)

Well he did say 99.9999% copper.

Yeah, but even so.. their US/Canadian web site is down, but on their
Euro site:

Uninsulated 1.0mm (0.04") Puratronic 99.9999% wire is GBP246.80 =
US$440 for one 5m (<15') length. That's going to be one expensive coil
if there's any amount of wire in it, assuming the insulation issue can
be solved.

On mundane chemicals you can often get a MT of industrial grade
material for what they want for 250gm.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[qrk]

On Mon, 3 May 2004 21:25:40 -0700, Mike <mike@nospam.com> wrote:

On Mon, 03 May 2004 20:51:07 -0700, John Larkin wrote:

On Mon, 3 May 2004 21:29:17 +0000 (UTC), kensmith@violet.rahul.net
(Ken Smith) wrote:


Does anyone know where I can find some 99.9999% pure copper wire?

I need some pure #22 gauge wire to wind some very non-magnetic coils for
some experiments.
--

Copper is diamagnetic, so its presence will distort a magnetic field.
This is a problem for the RF coils in NMR systems, where they'd like
their fields to be uniform to a few parts in 1e10. People sometimes
plate copper electrodes with mysterious stuff to make it closer to
magnetically neutral.

Some audio people will claim to sell you wire that's "five nines" or
"seven nines" but they mostly buy Belden and lie.

No! How can you say such a thing!?! Any audiophile can clearly hear the
difference between four-nines and five-nines - it makes the soundstage
dramatically more palpable, and vastly increases presence, expansiveness,
and promptness. Why, just this morning, I was noticing the deictic
dejecture and holocryptic palladian borborygm emanating from my stereo. It
was somniloquacious. Thank God for $100 per foot five-nines copper.

-- Mike --

You haven't lived the full audio experience unless you've "toasted"
your cables!

Mark

 

[Ian Stirling]

Ken Smith <kensmith@violet.rahul.net> wrote:

In article <9IPlc.39754$Y%6.5370985@wards.force9.net>,
Ian Stirling <root@mauve.demon.co.uk> wrote:
[....]
Is this for a proton precession magnetometer?

Yup.

Why can't you calibrate the error out, or are you trying to measure
the properties of the coil, not the external field?

Since the copper is not evenly distributed, the effect varies with angle.
Since we don't know the angle, we can't compensate perfectly for the
varying effect.

What's wrong with wrapping three orthogonal helmholtz coils round it,
and nulling?
That way the sensitivity falls out of the equation.
I'm probably just stating things you've thought of already.