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

Implementation of the Cryo-EXAFS environment at the XANES end station of the KMC-2 beamline

18 Sept 2018, 16:00
1h 30m
Fakultät für Maschinenwesen der Technischen Universität München

Fakultät für Maschinenwesen der Technischen Universität München

Boltzmannstraße 15 85748 Garching b. München
Poster MS1 In-situ and in-operando studies with special focus on energy materials and catalysis Poster session 2

Speaker

Götz Schuck (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH)

Description

The KMC-2 [1] beamline at BESSY II [2], operates a graded SiGe monochromator (energy resolution E/ΔE = 4000; energy range: 4 – 15 keV). The newly build Cryo-EXAFS environment at KMC-2 "XANES" end station has been developed for in situ gas absorption combined with X-ray powder diffraction experiments [3] and has been modified for use on the XANES end station. The Cryo-EXAFS is based on a Gifford-McMahon (GM) closed cycle cooler system. Exchange gas atmosphere of up to 150 kPa or vacuum can be utilized as sample environment. Continuous gas flow or controlled volumetric gas adsorption infrastructures are available. With an integrated heater stage the temperature range 15 - 450 K is accessible. Due to the double-dome construction for isolation vacuum and heat-exchange gas (Helium) temperature gradients in powder samples are very small. With multiple Kapton windows and a variable sample holder system, experiments can be conducted in both fluorescence and transmission geometry. The Cryo-EXAFS cryostat is mounted inside a three-axis translation motor stage for fine tuning of the sample position. Temperature readings and regulation, realized through a Lakeshore LS-336 controller is fully integrated into the instrument control software spec (CSS), allowing for fully automated temperature profile collection.

[1] Journal of large-scale research facilities 2, A49 (2016) doi: 10.17815/jlsrf-2-65
[2] helmholtz-berlin.de
[3] S. Krause et al., Nature, 532 (2016) 348

Primary authors

Götz Schuck (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH) Dr Daniel M. Többens (Helmholtz-Zentrum Berlin für Materialien und Energie) Dr Dirk Wallacher (Helmholtz-Zentrum Berlin für Materialien und Energie) Mr Nico Grimm (Helmholtz-Zentrum Berlin für Materialien und Energie) Prof. Susan Schorr (Helmholtz-Zentrum Berlin für Materialien und Energie & Institut für Geologische Wissenschaften, Freie Universität Berlin)

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