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SLS Vacuum System PowerPoint Presentation
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SLS Vacuum System

SLS Vacuum System

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SLS Vacuum System

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  1. SLS Vacuum System Lothar Schulz Theo Bieri Nazareno Gaiffi Martin Steinacher L. Schulz

  2. Main Parameter L. Schulz

  3. Chamber Design • 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 Photon absorber L. Schulz

  4. Chamber Design 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. L. Schulz

  5. Vacuum Sector Assembly and Bake-out • 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. L. Schulz

  6. U19 In-Vacuum Undulator Variable gap, Stainless Steel Length 2 m 3 In-Vacuum IDs (U19) are installed Wiggler Permanent Magnet Fixed gap 5 mm APS type Aluminum Length 2 m UE 212 Electro Magnet Fixed gap 18 mm Stainless Steel Length 11 m UE 56 Permanent Magnet Fixed gap 11 mm, BESSY type Aluminum Length 4 m Insertion Device Chambers L. Schulz

  7. Dynamic Pressure vs Accumulated Beam Dose L. Schulz