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Photon diagnostics at the FLASH THz beamline.

Rui Pan1, Ekaterina Zapolnova1, Torsten Golz1

  • 1Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, D-22607 Hamburg, Germany.

Journal of Synchrotron Radiation
|May 11, 2019
PubMed
Summary
This summary is machine-generated.

The FLASH facility developed novel diagnostic tools to characterize intense terahertz (THz) pulses, enabling advanced research in physics, materials science, and biology. These diagnostics address unique challenges in measuring THz pulse energy, spectra, and temporal profiles.

Keywords:
FLASHFTIRTHz diagnosticelectro-opticintense THz

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Area of Science:

  • Physics
  • Material Science
  • Biology
  • Accelerator Physics

Background:

  • The FLASH free-electron laser (FEL) facility offers intense, tunable terahertz (THz) pulses synchronized with X-ray pulses.
  • These THz pulses, alongside auxiliary ultrashort lasers, are valuable for dynamic investigations across multiple scientific disciplines.
  • The unique characteristics of FLASH THz pulses present specific challenges for precise parameter diagnostics.

Purpose of the Study:

  • To discuss the challenges in diagnosing key parameters of intense THz pulses at the FLASH facility.
  • To present the novel pulse diagnostic tools developed at FLASH for comprehensive THz beam characterization.
  • To demonstrate the capabilities of the THz beamline through measurement results.

Main Methods:

  • Radiometric power measurement for average pulse energy determination across the spectral range.
  • Jitter-corrected electro-optical sampling for complete spectro-temporal pulse characterization.
  • Spatial beam profiling and lamellar grating Fourier transform infrared spectroscopy for spectral assessment.

Main Results:

  • Successful implementation of radiometric measurements for accurate pulse energy assessment.
  • Detailed spectro-temporal characterization achieved using jitter-corrected electro-optical sampling.
  • On-line spectral assessment provided by the Fourier transform infrared spectrometer.

Conclusions:

  • The developed diagnostic tools effectively address the challenges of characterizing intense THz pulses at FLASH.
  • These diagnostics provide comprehensive insights into the THz beamline's capabilities for scientific applications.
  • The synchronized THz and X-ray pulses, coupled with advanced diagnostics, open new avenues for dynamic studies.