Tightened all flanges.

Added Pirani gauge and third IE514 to interaction chamber.

Stated pump down. Around 100 mbar on Interaction chamber Pirani gauge very loud metallic noise is heard. Found bellows between CARME and interaction chamber completely pressed flat. CARME and interaction chamber now much closer. Vented immediately. No pictures. Bellows return to normal state.

Repeated slowly and carefully using theodolite laser on reference point on CARME. Found CARME does not move appreciably forward, thus motion must come from interaction chamber frame.

Mounted two feet between CARME and interaction chamber. Pumped down again. Interaction chamber now moves by few mm. No issues with bellows. Left pumping overnight (Thu 4 November)

Found at 1E-6 mbar this morning. Leak tested. Found four minor leaks. Fixed by tightening. 

US + Kosmos installed Be window. Pumping down extremely slowly. 1 mbar per 2 second. Started turbo at 1 mbar. Pumping down overnight. No damage to window.

See attached new plastic free struts and motion of interaction chamber before after pumping. See skull nose.