Have done some more cutting on the Cs beam tube
Hello Time-Nits,
Ended up with a little free time and the saw nearby, so did some more
cutting on the cesium beam tube today. Links to some pictures are provided
for your enjoyment.
The first shot shows the new surgery. There is a U shaped metal shield
around the microwave waveguide (the copper portion) and I removed a section
from most of one side. This shield has the coil of yellow wire at the
bottom. I also cut a window (removing the bottom and side) in the next
shield out that is kind of a cross between a V and U shape.
The second shot shows the cut out shields again at a slightly different
angle. The beam path is from the NW to the SE in the picture (north up).
The third shot shows the beam path pretty well. You can see the holes for
the beam in the ends of the Y shaped waveguide (RF enters the bottom of the
Y). You can also see another coil around the beam path, I take it this is
the C-field coil. A think the coil around the bottom of the shield is the
degaussing coil. The four wires that you see are the connections for these
two coils.
The last shot shows the whole tube as it stands now. Now to find the time
to cut a wooden base and fashion a couple of standoffs to set it on.
Regards,
Skip Withrow
Hi Skip,
Fantastic 5061 tube photos. Museum quality. Thanks for sharing those with all of us.
Four coil wires makes sense, but...
-
The small coil around the beam line looks like the "LF coil"; used only for testing. A brief mention here:
https://www.febo.com/pipermail/time-nuts/2005-April/018149.html -
And the parallel wires around the cavity look like the C-field winding to me. Perhaps you can trace the pins / wires from the outside to the inside, either by inspection, or with ohmmeter, to verify this. I'd do it for you but I'm not near a 5061A right now. In fact, you can trace the other wires too (e.g., Cs oven heater, hot wire ionizer) while you're at it.
Unless yours is a high-perf 5061 tube I wonder if the degaussing coil even exists. Did you pull it from an option /004 frame? Check if there's a separate pair of degaussing wires coming from the tube and heading to the rear panel of the instrument. That would make a total of 6 coil wires.
Corby will know all of this for sure.
/tvb
----- Original Message -----
From: "Skip Withrow" skip.withrow@gmail.com
To: "time-nuts" time-nuts@febo.com
Sent: Saturday, February 18, 2017 5:18 PM
Subject: [time-nuts] Have done some more cutting on the Cs beam tube
Hello Time-Nits,
Ended up with a little free time and the saw nearby, so did some more
cutting on the cesium beam tube today. Links to some pictures are provided
for your enjoyment.
In message CA+oSWyWkj+LeZf_eo424yD-ShZPzeC8Lp6wnX+dsGvW8o+fxpA@mail.gmail.com
, Skip Withrow writes:
You can also see another coil around the beam path, I take it this is
the C-field coil. A think the coil around the bottom of the shield is the
degaussing coil. The four wires that you see are the connections for these
two coils.
I would suspect it is the other way around.
The very carefully laid out and mechanically fixed coil is for the
C-field, which should be uniform over the entire microwave field
and orthogonal to beam-path.
The small coil, somewhat haphazardly would in the middle of the
physics package, with a field parallel to the beam-path is much
more likely to be the degaussing coil.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
On 2/18/2017 7:43 PM, Tom Van Baak wrote:
Unless yours is a high-perf 5061 tube I wonder if the degaussing coil even exists. Did you pull it from an option /004 frame? Check if there's a separate pair of degaussing wires coming from the tube and heading to the rear panel of the instrument. That would make a total of 6 coil wires.
Corby will know all of this for sure.
/tvb
I remember that the degausser product that drove the
degaussing coil was a very low priority because Len
Cutler et al insisted that it was unnecessary to
degauss the CBT, at least in the 5071A. It finally
got produced just to satisfy a few customers who
believed they wanted it.
Rick
Really enjoy the pictures and the high resolution captures. Learning a lot.
I guessed the c field was the bottom coil and the small coil in the bean
was the LF coil. But it clearly explains the low z of the LF coil. Boy
thats about a direct short. :-)
With respect to the C Field Toms pix help make more sense of the wiring.
Regards
Paul
WB8TSL
On Sun, Feb 19, 2017 at 7:38 AM, Richard (Rick) Karlquist <
richard@karlquist.com> wrote:
On 2/18/2017 7:43 PM, Tom Van Baak wrote:
Unless yours is a high-perf 5061 tube I wonder if the degaussing coil
even exists. Did you pull it from an option /004 frame? Check if there's a
separate pair of degaussing wires coming from the tube and heading to the
rear panel of the instrument. That would make a total of 6 coil wires.
Corby will know all of this for sure.
/tvb
I remember that the degausser product that drove the
degaussing coil was a very low priority because Len
Cutler et al insisted that it was unnecessary to
degauss the CBT, at least in the 5071A. It finally
got produced just to satisfy a few customers who
believed they wanted it.
Rick
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