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The fluctuation-dissipation measurement instrument at the Linac Coherent Light Source
T A Assefa1, M H Seaberg2, A H Reid2
1Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
The Review of Scientific Instruments
|September 1, 2022
Summary
New instruments at X-ray Free Electron Lasers enable ultrafast studies of quantum materials. Researchers developed advanced tools for resonant magnetic scattering and fluctuation-dissipation measurements, achieving higher momentum resolution.
Area of Science:
- Condensed Matter Physics
- Materials Science
- X-ray Science
Background:
- Advancements in X-ray Free Electron Lasers (XFELs) offer new possibilities for studying dynamic processes.
- Understanding fluctuations in quantum materials requires high-resolution measurements on ultrafast timescales.
Purpose of the Study:
- To develop and demonstrate advanced instrumentation for studying quantum materials using ultrafast XFELs.
- To enable precise measurements of fluctuations in materials at various energy and time scales.
Main Methods:
- Construction of a prototype instrument for resonant magnetic scattering with ultrafast pulse pairs.
- Development of a fluctuation-dissipation measurement instrument utilizing a fast area detector.
- Implementation of diagnostics for single-shot contrast measurements for data normalization and calibration.
Main Results:
- Successful proof-of-principle for resonant magnetic scattering using ultrafast pulse pairs.
- Demonstration of the fluctuation-dissipation measurement instrument's capability.
- Achieved higher momentum resolution in material fluctuation studies.
Conclusions:
- The developed instruments provide novel capabilities for investigating quantum materials.
- These tools facilitate detailed studies of material dynamics and fluctuations.
- The advancements pave the way for deeper insights into quantum material properties.
