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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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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.

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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.