Rebecca R. Armenta
Staff Engineer, SLAC National Accelerator Laboratory
All Publications
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A high-throughput energy-dispersive tender X-ray spectrometer for shot-to-shot sulfur measurements.
Journal of synchrotron radiation
2019; 26 (Pt 3): 629–34
Abstract
An X-ray emission spectrometer that can detect the sulfur Kalpha emission lines with large throughput and a high energy resolution is presented. The instrument is based on a large d-spacing perfect Bragg analyzer that diffracts the sulfur Kalpha emission at close to backscattering angles. This facilitates the application of efficient concepts routinely employed in hard X-ray spectrometers towards the tender X-ray regime. The instrument described in this work is based on an energy-dispersive von Hamos geometry that is well suited for photon-in photon-out spectroscopy at X-ray free-electron laser and synchrotron sources. Comparison of its performance with previously used instrumentation is presented through measurements using sulfur-containing species performed at the LCLS. It is shown that the overall signal intensity is increased by a factor of 15. Implementation of this approach in the design of a tender X-ray spectroscopy endstation for LCLS-II is also discussed.
View details for DOI 10.1107/S1600577519002431
View details for PubMedID 31074425
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The Macromolecular Femtosecond Crystallography Instrument at the Linac Coherent Light Source
JOURNAL OF SYNCHROTRON RADIATION
2019; 26: 346–57
View details for DOI 10.1107/S1600577519001577
View details for Web of Science ID 000460859600007
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The Macromolecular Femtosecond Crystallography Instrument at the Linac Coherent Light Source.
Journal of synchrotron radiation
2019; 26 (Pt 2): 346–57
Abstract
The Macromolecular Femtosecond Crystallography (MFX) instrument at the Linac Coherent Light Source (LCLS) is the seventh and newest instrument at the world's first hard X-ray free-electron laser. It was designed with a primary focus on structural biology, employing the ultrafast pulses of X-rays from LCLS at atmospheric conditions to overcome radiation damage limitations in biological measurements. It is also capable of performing various time-resolved measurements. The MFX design consists of a versatile base system capable of supporting multiple methods, techniques and experimental endstations. The primary techniques supported are forward scattering and crystallography, with capabilities for various spectroscopic methods and time-resolved measurements. The location of the MFX instrument allows for utilization of multiplexing methods, increasing user access to LCLS by running multiple experiments simultaneously.
View details for PubMedID 30855242