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41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
SLS Vacuum System
Lothar SchulzTheo Bieri
Nazareno GaiffiMartin Steinacher
41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
Main Parameter
41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
• 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
41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
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
41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
• 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
41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
Fixed gap 11 mm, BESSY typeAluminumLength 4 m
UE 56Permane
nt Magnet
Fixed gap 18 mmStainless SteelLength 11 m
UE 212Electro Magnet
Fixed gap 5 mm APS typeAluminumLength 2 m
WigglerPermanent
Magnet
Variable gap, Stainless SteelLength 2 m3 In-Vacuum IDs (U19) are installed
U19In-Vacuum Undulator
Insertion Device Chambers
41st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz
PAUL SCHERRER INSTITUT
Dynamic Pressure vs Accumulated Beam Dose