- Letter
Measurement of femtosecond incoherent XUV pulses using shot-noise-driven fluctuations in plasma betatron sources
Phys. Rev. E 111, L013201 – Published 15 January, 2025
DOI: https://doi.org/10.1103/PhysRevE.111.L013201
Abstract
The duration of incoherent XUV pulses down to the femtoseconds (fs) can be retrieved through a statistical analysis of the modulations on the observed radiation spectrum. Uncorrelated shot-noise fluctuations in the pulse temporal profile result in incoherent radiation showing a multispike spectrum where the spike width is inversely proportional to the pulse length. In this Letter, single-shot temporal characterization of the betatron radiation pulses emitted by fs-long, 100's MeV electron bunches undergoing acceleration, and propagating through a plasma wiggler was performed in the XUV domain. The retrieved pulse lengths agree with independent measurements performed in the THz spectral range and with theoretical predictions.
Physics Subject Headings (PhySH)
- Electromagnetic field calculations
- Photonics
- Secondary beams
- Shot noise
- Electron sources
- Low- & intermediate-energy accelerators
- Medical applications of accelerators
- Particle accelerator facilities
- Pulsed-power accelerators
- Synchrotron radiation & free-electron lasers
- Energy-dispersive x-ray spectroscopy
- Photon counting
