I went to the staging building to fetch a 50:50 P-pol IR splitter and saw Betsy and Srinath baking FC cavity tubes. Here are some pictures.

1st: They can bake two sets at a time and each set comprises two sections connected together. There are 48 sections (i.e. 24 sets), they need to be baked at 110+ Celcius for ~3 days, so this has been a long laborious process which is still ongoing.

2nd: All sets are pumped down before and while baking.

3rd: They already wrapped the heater element around the tube and they're ready to put the insulation material on.

4th: Insulation material is all velcro-ed up (except that it's not, Betsy won't be ready to turn the heater on until the joint in the middle is also covered up by a narrower insulation strip).