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Description
The Balder beamline is placed at the 3 GeV storage ring at MAX IV Laboraty (a 4th generation synchrotron) and is dedicated to X-ray absorption and emission spectroscopy in the energy range of 2.4–40 keV [1]. The beamline can deliver a very high photon flux of 1013 ph/s and is suitable for experiments under in situ / operando conditions. This kind of experiment requires support for fast continuous scan with good data quality and support for sequential multi-techniques data acquisition (DAQ) for a better analysis and study of the sample dynamics [2].
This work describes the multimodal DAQ system implemented at the Balder beamline, combining the complementary techniques X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) in a single experiment. To achieve stable and quick energy scans, multiple energy edges and XRD acquisition positions are loaded all at once to the motor controller ACS SPiiPlusEC. The motion is performed in trajectory which allows sequential energy spectrums and XRD acquisitions to be performed sequentially in sub-second time resolution. The experiment synchronization is performed with PandABox [3], a FPGA trigger unit, which can generate TTL signals based on the motors current position described in a sequencer table. For the multimodal system, each technique (XAS and XRD) related detectors receive a different pulse train based on the current energy motor position. Furthermore, the experiment is orchestrated and performed with Sardana [4]. A dedicated Sardana scan macro is used to load XAS-XRD scan conditions as well to prepare the trajectory in the motor controller. User-friendliness is achieved using dedicated Taurus GUI on top of Sardana, where each technique can be sequenced and configured by a visual drag-and-drop system.
https://indico.esrf.fr/event/114/images/132-abstract%20vanessa.png
Figure 1: Multimodal XAS-XRD experiment diagram correlating sequential XAS energy scan with XRD acquisition positions together with generated external triggers
[1] K. Klementiev, K. Norén, S. Carlson, K. G. V. S. Clauss, and I. Persson, “The balder beamline at the max iv laboratory,” Journal of Physics: Conference Series 712, 012023 (2016)
[2] 1. K. Klementiev, H. Tarawneh, and P. F. Tavares, “Wiggler radiation at a low-emittance storage ring and its usage for X-ray absorption spec- troscopy,” Journal of Synchrotron Radiation 29, 462–469 (2022)
[3] S. Zhang et al., “PandABox: A Multipurpose Platform for Multi-technique Scanning and Feedback Applications”, in Proc. ICALEPCS’17, Barcelona, Spain, Oct. 2017, pp. 143–150. doi:10.18429/JACoW-ICALEPCS2017-TUAPL05
[4] T. M. Coutinho et al., “Sardana: The Software for Building SCADAS in Scientific Environments”, in Proc. ICALEPCS’11, Grenoble, France, Oct. 2011, paper WEAAUST01, pp. 607–609.
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