41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz SLS Vacuum System Lothar...

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



Main Parameter



• 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



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



• 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



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



Dynamic Pressure vs Accumulated Beam Dose

41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz SLS Vacuum System Lothar...

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Transcript of 41 st IUVSTA Workshop, Brdo pri Kranju, 21/06 – 24/06/2004 L. Schulz SLS Vacuum System Lothar...