41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz SLS Vacuum System Lothar Schulz Theo Bieri Nazareno Gaiffi Martin Steinacher

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz Main Parameter

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz Stainless steel vacuum chambers with full ante chamber design. Photon flux is concentrated on lumped OFHC absorbers. Pumps are installed close to the photon absorbers. Flat seal flanges are used. (chamber toleranzes ±0.05 mm longitudinal, ±0.1 mrad angular) Photon absorber Chamber Design Photon absorber

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz SLS Cell Due to the small chamber tolerances the total number of bellows could be minimized. No bellows in the magnet cells. Only in the straights two bellows are installed. Chamber movements are detected with two dial gauges per BPM station. Chamber Design

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz Vacuum sections assembled outside the storage ring in a clean room and baked at 250 °C in a oven. During the bake-out, the vacuum sections hang on chains in the oven so that the thermal expansion can take place freely. Sputter ion pumps started during cool down at 150 °C. Vacuum chambers installed under vacuum into the storage ring. Straight sections are baked in-situ with a mobile oven. Vacuum Sector Assembly and Bake-out

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz Fixed gap 11 mm, BESSY type Aluminum Length 4 m UE 56 Permanent Magnet Fixed gap 18 mm Stainless Steel Length 11 m UE 212 Electro Magnet Fixed gap 5 mm APS type Aluminum Length 2 m Wiggler Permanent Magnet Variable gap, Stainless Steel Length 2 m 3 In-Vacuum IDs (U19) are installed U19 In-Vacuum Undulator Insertion Device Chambers

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz Dynamic Pressure vs Accumulated Beam Dose