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17–19 Sept 2018
Fakultät für Maschinenwesen der Technischen Universität München
Europe/Berlin timezone

High-Flux XAFS-Beamline P64 at PETRA III

17 Sept 2018, 16:30
1h 30m
Fakultät für Maschinenwesen der Technischen Universität München

Fakultät für Maschinenwesen der Technischen Universität München

Boltzmannstraße 15 85748 Garching b. München
Poster P1 Instrumentation and methods Poster session 1

Speaker

Wolfgang Caliebe (DESY)

Description

Beamline P64 is dedicated to XAFS-experiments which require high flux like QEXAFS on the 10ms time-scale, EXAFS of highly diluted systems, and resonant high-resolution x-ray emission spectroscopy. We will present the optical set-up of the beamline (undulator, monochromators, mirrors, detectors), characteristics of these components, describe different operation modes for EXAFS-scans (continuous versus step-scans), and show some typical data from the first 2 years of user operation.
The time required for one energy scan varies from 10ms (QEXAFS) to 1200s (measurements of highly diluted systems). In the first case, the undulator is tapered in order to broaden its energy spectrum, and a special monochromator oscillates with a frequency of 50Hz while the intensities of the detectors and the angle of the monochromator are measured simultaneously with 2MHz. In the latter case, monochromator and undulator move together from one energy-point to the next, and the intensities are recorded (step-scan). This type of scan is applied for highly diluted samples in combination with a 100-element energy-dispersive Ge-Detector. Conventional continuous scans take 60-300s.
So far, users have performed experiments in the fields of solid state physics, catalysis, bio-chemistry, biology, and environmental sciences with different sample environments like cryostats, electro-chemical cells, capillary-reactors, with liquid jets, or as conventional pellets in air.

Primary author

Wolfgang Caliebe (DESY)

Co-authors

Mr Vadim Murzin (DESY) Aleksandr Kalinko (Univ. Paderborn) Marcel Goerlitz (DESY)

Presentation materials

There are no materials yet.