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Temporal X-ray Reconstruction using Temporal and Spectral Measurements at LCLS
Florian Christie1,2, Alberto Andrea Lutman3, Yuantao Ding3
1Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany. florian.christie@desy.de.
Scientific Reports
|June 20, 2020
Summary
Transverse deflecting structures (TDSs) can now resolve single X-ray spikes by combining spectrometer and TDS data. This enhanced method improves temporal intensity profile reconstruction for accelerator physics research.
Area of Science:
- Accelerator Physics
- Ultrafast Science
- X-ray Science
Background:
- Transverse deflecting structures (TDSs) are crucial for measuring longitudinal bunch density in accelerator physics.
- At the Linac Coherent Light Source (LCLS), TDSs enable X-ray temporal intensity profile reconstruction.
- Current TDS resolution (~1 fs rms) limits observation of single self-amplified spontaneous emission (SASE) spikes.
Purpose of the Study:
- To enhance the resolution of TDS measurements for resolving single SASE spikes.
- To improve the reconstruction of X-ray temporal intensity profiles.
- To present advancements in the reconstruction algorithm and real-world data from LCLS.
Main Methods:
- Combining data from a high-resolution photon spectrometer and a TDS.
- Utilizing an iterative algorithm for analyzing combined spectral and temporal data.
- Implementing improvements to the existing reconstruction algorithm.
Main Results:
- Achieved enhanced resolution enabling the observation of temporal, single SASE spikes.
- Successfully reconstructed X-ray temporal intensity profiles with improved accuracy.
- Validated the improved algorithm with real data acquired at LCLS.
Conclusions:
- The combination of spectrometer and TDS data significantly enhances temporal resolution.
- The improved iterative algorithm allows for detailed analysis of ultrafast X-ray pulse structures.
- This technique provides unprecedented insight into SASE spike dynamics at LCLS.