Betatron Radiation in Laser-driven Electron Accelerators
Event details
| Date | 10.09.2012 |
| Hour | 10:30 › 11:30 |
| Speaker | A. Döpp, Institute for Theory of Statistical Physics, RWTH Aachen University, Aachen, Germany |
| Location |
PPB 019
|
| Category | Conferences - Seminars |
The advent of laser-driven electron acceleration from underdense plasmas concurs with the development of novel light sources. Beside the possibility of injecting laser-accelerated electrons in conventional insertion devices, transverse oscillations in the plasma-channel that electrons perform during the acceleration process can lead to bright synchrotron-like radiation, widely referred to as Betatron radiation. The energy of this radiation extends into the hard x-ray regime,with an intensity maximum at ~1-10keV. A typical source size of several microns at milliradian divergence results in high spatial coherence and a peak brightness of 10^4-5 photons/mrad^2 is reached. The presented work concentrates on theoretical and experimental studies of the emitted radiation spectra.
Numerical treatment involves Particle-In-Cell simulations with particle tracking, but is computationally very costly. As the radiation fields add up incoherently in the plasma wiggler regime, a new numerical method interpolates over sinusoïdal trajectory elements. Due to this approximation, the radiation of whole electron bunches can be studied. Deviations from the on-axis wiggler spectrum of mono-energetic electrons d2I=dWdw µ c2K22/3(c2), with c=w/wcrit, are discussed. Numerical results are in good agreement with measurements at Lund Laser Centre using a multi-terawatt Ti:sapphire laser.
Numerical treatment involves Particle-In-Cell simulations with particle tracking, but is computationally very costly. As the radiation fields add up incoherently in the plasma wiggler regime, a new numerical method interpolates over sinusoïdal trajectory elements. Due to this approximation, the radiation of whole electron bunches can be studied. Deviations from the on-axis wiggler spectrum of mono-energetic electrons d2I=dWdw µ c2K22/3(c2), with c=w/wcrit, are discussed. Numerical results are in good agreement with measurements at Lund Laser Centre using a multi-terawatt Ti:sapphire laser.
Practical information
- Informed public
- Free
Organizer
- CRPP
Contact
- Prof. P. Ricci