sls vacuum system
DESCRIPTION
SLS Vacuum System. Lothar Schulz Theo Bieri Nazareno Gaiffi Martin Steinacher. Main Parameter. 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. - PowerPoint PPT PresentationTRANSCRIPT
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