J. Horbach for Desy FS-BT

DESY FS-BT at PETRA III: Optics and Large Monochromator Systems.

- Selection of a small energy band out of the High Heat Load monochromator beam

- Vertical shift of the beam by 1.25 m

- Stabilization of the beam position at the experiment

- Energy rangeSi 311: 5.4 – 18.8 keVSi 511: 8.4 – 29.4 keV

- Precision of the beam position at the experiment (distance approx. 20 m): 10 µm in lateral and vertical direction→ Angular accuracy of 0.5 µrad needed

Large Offset Monochromator in operation at P08

Large Offset Monochromator in operation at P03

- Displacement of the white beam by 0.49 m downwards

- Energy range 8 - 25keV

- Beam position stability of 1µm required at the experimental station

- Liquid nitrogen cooling system for both crystals (Si 111) and multilayers

Monochromator at P06manufacturing in progress at DESY-Zeuthen

Multilayer setup with fixed position

LN2 flexible tubes

Movable multilayer setup

3.9 m

- Displacement of the white beam by 21 mm downwards

- Energy range 6 – 90 keV

- Liquid nitrogen cooling system for both multilayers

10 mm offsetupwards

mirror: silicon oxide (fused silica)coatings: palladium

mirror 2 is bendable(concave, radius: 5 – 50 km)

Focussing mirrors in operation at P09

resolutions:- translations: 100 nm- rotary table: 40 nrad- pitch angle: 15,3 nrad

High Heat Load Monochromators in operation at several beamlines

- 50 µrad resolution of bragg axis- 18 nrad resolution of bragg piezo- offset 21 mm upwards

ion getter pump

micromover for alignment oflower linear drive

micromover for alignment ofupper linear drive

vacuumfeedthroughs

Mirrors for higher-order suppression

under construction at P06

16 mm offset to the right

mirror: siliconcoatings: chrome, platinum

in operation at P10

6,5 mm offset to the left

10 mm offset downwards

mirror: siliconcoatings: molybdenum, palladium

in operation at P03

Diamond / Si Laue monochromator in operation at P02

side station with fixed energy at 60 keV

DiamondSi

mirror: silicon oxide (fused silica)coatings: platinum, rhodium

profile of mirror 1

profile of mirror 2

radius 88 mm radius 58 mmPd

Pd