Radio pulsar emission & Free Electron Laser on transverse wiggler

1. Radio pulsar emission&Free Electron Laser on transverse wiggler Pui-Kei Fung* & Jan Kuijpers ** *Utrecht University **University of Nijmegen Preprint fk2004v2.pdf at www.astro.kun.nl/~kuijpers Heidelberg Workshop

2. Free Electron Laser For transverse wiggler, to first order: And, to second order, the resonance frequency becomes: Heidelberg Workshop

3. Ponderomotive force and bunching Heidelberg Workshop

4. Code: General Particle Tracer Macroparticles, each representing Nq elementary particles Heidelberg Workshop

5. Heidelberg Workshop

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7. Bunching and coherence Heidelberg Workshop

8. Starting time bunching: 10 oscillations in lab frame Run 3: wiggler 100,50,40,25 m. Run 4: phase speed 0.2,0.5, 0.8,0.9 Heidelberg Workshop

9. Maximum radiation for K=1 Run 2: K=5, 10, 15, 20 Heidelberg Workshop

10. Spectrum: bandwidth increases with # of bunchings Run 3: wiggler 100,50,40,25 m. Run 4: phase speed 0.2,0.5, 0.8,0.9 Run 6: density 0.1, 0.2, 0.3, 0.4 Heidelberg Workshop

11. Pulse structure increases with # of bunchings Run 2: K=5, 10, 15, 20 Run 3: wiggler 100,50,40,25 m. Run 4: phase speed 0.2,0.5, 0.8,0.9 Run 6: gamma 1000, 500, 250, 100 Heidelberg Workshop

12. Ambient magnetic field Run 5 ambient fields 10-3, 10-2, 2.5 10-2, 5.0 10-2 T Heidelberg Workshop

13. Brightness temperature: 0.22 - 2.8 x 1030 K • Duration: nanosecs but scales with • 10 effective wavelengths, and goes up by • factor 1000 for wiggler Lorentz factor 100. • Opening angle: • Electrons and positrons add constructively! Heidelberg Workshop