Coherent Synchrotron Radiation by Excitation of SPPs on Near-Critical CNT
6 days ago
- #Synchrotron Radiation
- #Surface Plasmon Polaritons
- #Plasma Physics
- Coherent synchrotron radiation (CSR) is essential for powerful ultrashort light sources.
- A mechanism for generating CSR via surface plasmon polaritons (SPPs) on a near-critical-density microtube surface is presented.
- A high-intensity, circularly polarized laser pulse excites cylindrical SPP modes, creating rotating electromagnetic fields.
- These fields confine, modulate, and accelerate surface electrons to emit CSR at the Vavilov-Cherenkov angle.
- Improving azimuthal symmetry of electrons enables CSR emission in all directions as isolated harmonics, enhancing radiation intensity.
- 3D Particle-in-Cell simulations show X-ray coherence enhanced by up to two orders of magnitude compared to incoherent emission.
- Challenges include high-contrast lasers to prevent pre-plasma and precise microtube fabrication and alignment, but are feasible with current or near-future technology.