Speaker
Description
To measure longitudinal profiles at picosecond resolution, optical diagnostics using Cherenkov Radiation (ChR) must generate light with sufficient intensity, ensuring propagation to a detector with minimum dispersion and attenuation. Existing radiators (ChR generation media) exhibit a trade-off between ChR intensity and dispersion, with larger radiators creating higher ChR intensity at the cost of increased dispersion, and smaller radiators suffering the opposite. Conventional multimode optical fibers constitute flexible ChR radiators allowing convenient light outcoupling, but suffer a similar trade-off. We demonstrate a novel radiating light guide, the photonic lantern, to overcome this problem. Developed at SAIL (Sydney Astrophotonic Instrumentation Laboratory), the multimode lantern tip is irradiated with electrons at the PEER facility (Pulsed Energetic Electrons for Research) of the Australian Synchrotron, emitting ChR at intensities comparable to conventional multimode optical fibers. Multimode ChR is fed to 300 single mode cores via an adiabatic transition for dispersion-free transport to a streak camera. Bunch profiles from the lantern are compared to those from conventional optical fibers. Advantages of fiber radiators are retained, such as greater flexibility, relative affordability and convenient outcoupling, while dispersion characteristics are improved. We highlight potential to retrofit the photonic lantern at existing IR-FELs, alongside S-band and X-band linacs.
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| Supervisor's name | Dr. Matteo Volpi |
| Supervisor's email | mvolpi@unimelb.edu.au |
| Paper submission software | LATeX |