Subject: Digging deeper into the Cs tube
From: Skip Withrow 
Date: 9/14/2023 10:44 AM
To: time-nuts@lists.febo.com

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