Digging deeper into the Cs tube
Hello Time-Nuts,
I took a second look at the Cs tube that I opened up recently and decided
to dig a little deeper. Previously, after cutting a window in the mu metal
shield around the microwave waveguides, I found that there was another mu
metal shield under that.
CsTube-1 - I decided to drill six strategic holes in the outer case so that
I could unscrew the fasteners for the outer mu metal shield to remove it
altogether.
CsTube-2 - Shows the outer mu metal shield (with the window that I had cut
in it). It was necessary to bend up the mounting flange a bit to clear
other fasteners.
CsTube-3 - I cut a window in the second mu metal shield and found that the
microwave waveguides are wrapped in Kaption. The shield fits very tight to
the bits that it encloses.
CsTube-4 - The C-field coil is embedded in the Kapton wrap. You can see
the copper stripes running lengthwise along the bottom of the tube.
CsTube-5 - The microwave waveguide is at either end of the cut out window
(the screw heads appear to hold all the copper bits together to form the
waveguide. You can see the rectangular hole that the beam passes through
as it travels through the waveguide from one of the tube to the other. I
suppose that I could remove the Kapton on the side to expose things better.
Enjoy,
Skip Withrow
More exciting pix. to add to the collection.
Couple of questions.
The bands of copper running along I think the wave guide. C field.
What are the 8 or so wires coiled in a figure 8?
Lastly I have seen C tubes with cut off wires. I think ebay for cheap.
(Because their dead. Chuckle)
With the great pix of the wires going in can you please make a cheat sheet
of each lead. I would be happy to do it if you would like.
Thinking ppt with simple thermistor cfield etc.
Might make it tempting to grab a cut wire unit. Nutty as that seems and the
worst possible gamble.
Best regards Skip and thanks for sharing.
Paul
WB8TSL
On Sat, Sep 16, 2023 at 1:56 AM Skip Withrow via time-nuts <
time-nuts@lists.febo.com> wrote:
Hello Time-Nuts,
I took a second look at the Cs tube that I opened up recently and decided
to dig a little deeper. Previously, after cutting a window in the mu metal
shield around the microwave waveguides, I found that there was another mu
metal shield under that.
CsTube-1 - I decided to drill six strategic holes in the outer case so that
I could unscrew the fasteners for the outer mu metal shield to remove it
altogether.
CsTube-2 - Shows the outer mu metal shield (with the window that I had cut
in it). It was necessary to bend up the mounting flange a bit to clear
other fasteners.
CsTube-3 - I cut a window in the second mu metal shield and found that the
microwave waveguides are wrapped in Kaption. The shield fits very tight to
the bits that it encloses.
CsTube-4 - The C-field coil is embedded in the Kapton wrap. You can see
the copper stripes running lengthwise along the bottom of the tube.
CsTube-5 - The microwave waveguide is at either end of the cut out window
(the screw heads appear to hold all the copper bits together to form the
waveguide. You can see the rectangular hole that the beam passes through
as it travels through the waveguide from one of the tube to the other. I
suppose that I could remove the Kapton on the side to expose things better.
Enjoy,
Skip Withrow
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For those of you [1] who missed Skip's cesium beam tube photos, see:
http://leapsecond.com/u/skip/CBT-2023/inside.html
The full collection of his CBT postings is here:
With the great pix of the wires going in can you please make a cheat
sheet of each lead.
Paul, it's documented in detail in chapter 8 of the 5061B op/service
manual. If you don't want to read the full manual I've placed a copy of
the CBT diagram-only here (see also attached image):
http://leapsecond.com/museum/hp5061b/5061B-Ch8-Pg5-Circuit-Diagrams-1700x850.jpg
/tvb
[1] members using compact digest mode don't get attachments.
On 9/16/2023 8:40 AM, paul swed via time-nuts wrote:
More exciting pix. to add to the collection.
Couple of questions.
The bands of copper running along I think the wave guide. C field.
What are the 8 or so wires coiled in a figure 8?
Lastly I have seen C tubes with cut off wires. I think ebay for cheap.
(Because their dead. Chuckle)
With the great pix of the wires going in can you please make a cheat sheet
of each lead. I would be happy to do it if you would like.
Thinking ppt with simple thermistor cfield etc.
Might make it tempting to grab a cut wire unit. Nutty as that seems and the
worst possible gamble.
Best regards Skip and thanks for sharing.
Paul
WB8TSL
On Sat, Sep 16, 2023 at 1:56 AM Skip Withrow via time-nuts <
time-nuts@lists.febo.com> wrote:
Hello Time-Nuts,
I took a second look at the Cs tube that I opened up recently and decided
to dig a little deeper. Previously, after cutting a window in the mu metal
shield around the microwave waveguides, I found that there was another mu
metal shield under that.
CsTube-1 - I decided to drill six strategic holes in the outer case so that
I could unscrew the fasteners for the outer mu metal shield to remove it
altogether.
CsTube-2 - Shows the outer mu metal shield (with the window that I had cut
in it). It was necessary to bend up the mounting flange a bit to clear
other fasteners.
CsTube-3 - I cut a window in the second mu metal shield and found that the
microwave waveguides are wrapped in Kaption. The shield fits very tight to
the bits that it encloses.
CsTube-4 - The C-field coil is embedded in the Kapton wrap. You can see
the copper stripes running lengthwise along the bottom of the tube.
CsTube-5 - The microwave waveguide is at either end of the cut out window
(the screw heads appear to hold all the copper bits together to form the
waveguide. You can see the rectangular hole that the beam passes through
as it travels through the waveguide from one of the tube to the other. I
suppose that I could remove the Kapton on the side to expose things better.
Enjoy,
Skip Withrow
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
For uniform field, I’d expect that c-field would be parallel traces all carrying the same current when parallel rather than a solenoid configuration. If you simply had alternate ends strapped the fields would reverse rather than be homogeneous.
From: paul swed via time-nuts time-nuts@lists.febo.com
Sent: Saturday, September 16, 2023 10:40:33 AM
To: swithrow@alum.mit.edu swithrow@alum.mit.edu; Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Cc: Skip Withrow skip.withrow@gmail.com; paul swed paulswedb@gmail.com
Subject: [time-nuts] Re: Digging deeper into the Cs tube
More exciting pix. to add to the collection.
Couple of questions.
The bands of copper running along I think the wave guide. C field.
What are the 8 or so wires coiled in a figure 8?
Lastly I have seen C tubes with cut off wires. I think ebay for cheap.
(Because their dead. Chuckle)
With the great pix of the wires going in can you please make a cheat sheet
of each lead. I would be happy to do it if you would like.
Thinking ppt with simple thermistor cfield etc.
Might make it tempting to grab a cut wire unit. Nutty as that seems and the
worst possible gamble.
Best regards Skip and thanks for sharing.
Paul
WB8TSL
On Sat, Sep 16, 2023 at 1:56 AM Skip Withrow via time-nuts <
time-nuts@lists.febo.com> wrote:
Hello Time-Nuts,
I took a second look at the Cs tube that I opened up recently and decided
to dig a little deeper. Previously, after cutting a window in the mu metal
shield around the microwave waveguides, I found that there was another mu
metal shield under that.
CsTube-1 - I decided to drill six strategic holes in the outer case so that
I could unscrew the fasteners for the outer mu metal shield to remove it
altogether.
CsTube-2 - Shows the outer mu metal shield (with the window that I had cut
in it). It was necessary to bend up the mounting flange a bit to clear
other fasteners.
CsTube-3 - I cut a window in the second mu metal shield and found that the
microwave waveguides are wrapped in Kaption. The shield fits very tight to
the bits that it encloses.
CsTube-4 - The C-field coil is embedded in the Kapton wrap. You can see
the copper stripes running lengthwise along the bottom of the tube.
CsTube-5 - The microwave waveguide is at either end of the cut out window
(the screw heads appear to hold all the copper bits together to form the
waveguide. You can see the rectangular hole that the beam passes through
as it travels through the waveguide from one of the tube to the other. I
suppose that I could remove the Kapton on the side to expose things better.
Enjoy,
Skip Withrow
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com