Speaker
Description
A high-speed fly-scan system has been developed and implemented at the Taiwan Photon Source (TPS) 32A Tender X-ray Absorption Spectroscopy (TXAS) beamline to enhance data acquisition efficiency for X-ray Absorption Spectroscopy (XAS). Unlike conventional fly-scan systems that rely on Field Programmable Gate Array (FPGA) or CompactRIO (cRIO) platforms, this system adopts a programmable logic controller (PLC)-based architecture, offering high modularity, low development complexity, and seamless integration with existing beamline infrastructure. The system enables continuous scanning of the double-crystal monochromator (DCM) while simultaneously acquiring synchronized data from multiple detectors. Analog-to-digital converters (ADCs) digitize current signals for transmission and total electron yield (TEY) modes, while high-speed digital outputs from the PLC provide external triggers for silicon drift detectors (SDDs) used in partial fluorescence yield (PFY) measurements. This approach simplifies the coordination of asynchronous devices and eliminates the need for complex timing hardware. To further optimize performance, a multi-region scan strategy was implemented, allowing dynamic adjustment of scan speed across different energy segments. This significantly reduces total scan time by up to a factor of six compared to traditional step-scan methods, while maintaining comparable spectral quality. The PLC-based fly-scan system also supports real-time data logging, automated sample switching, and energy-axis registration, making it a robust and scalable solution for time-resolved and in-situ XAS experiments.
Funding Agency
National Science and Technology Council, R.O.C.
Footnotes
- Corresponding author: chengeliang@nsrrc.org.tw
This work was supported by the National Synchrotron Radiation Research Center (NSRRC) and funded in part by the National Science and Technology Council (NSTC), Taiwan.
* The fly-scan system was developed using a PLC-based architecture to simplify integration with external detectors such as SDDs.
