Vaccum chamber SFM Vacuum chamber for intersection I-4

Vacuum chamber for intersection I-4 of the ISR being assembled inside a wooden mock-up of the gap of the split-field magnet. The central round-cylinder section was provisional and was to be replaced by an elliptic-cylinder section to give more space vertically for installation of detectors. Supports for the central section are of carbon fibre composite and the extended arms of the chamber were supported by stainless steel wires.