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Remaking 96-wire feedthrough
Aug-Sep 2023

This is 96-wire feedthrough for cryostat thermometers and heaters. The first version have been made in June 2020 and worked nicely for many cooldowns (see https://slazav.xyz/lt/2020_f4_w1.htm). In summer 2023 it start leaking and I replaced it.

As I understand, the main problem was 16-wire bundles tightly packed in nylon sleeves inside the feedthrough. It was hard to feel them with Stycast. In the new version sleeves are not continuous and wires are exposed to Stycast.

For a future version it would be good to use transparent plastic shell (polycarbonate or Stycast) to see Stycast filling inside the feedthrough.

twisted pairs and feedthrough parts

gaps in Nylon sleeves

ready for Stycast filling

Old feedthrough - lower PCB

Old feedthrough - upper PCB

holder for soldering lower PCB

old feedthrough extracted

cross-cut

glueing the new one

soldering upper PCB

ready for installation

feedthrough soldered to the vacuum can flange

lower PCB soldered