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Physics Seminar: Bessel-Bessel Laser Bullets and Cosmic Zevatron
Part I: Bessel-Bessel Laser Bullets
Considerable theoretical and experimental work has lately been focused on waves localized in time and space. In optics, waves of that nature are often referred to as light bullets. The most fascinating feature of light bullets is their propagation without appreciable distortion by diffraction or dispersion. Electromagnetic fields of a Bessel-Bessel bullet of arbitrary order, propagating in an under-dense plasma, will be discussed. The fields are derived from a vector potential involving an ordinary Bessel function of arbitrary order and a spherical Bessel function of order zero, hence the designation Bessel-Bessel bullet.
Part II: Cosmic Zevatron
A Zevatron is an accelerator scheme envisaged to accelerate particles to ZeV energies (1 ZeV = 1021 eV). Zevatron schemes have been proposed to explain the acceleration of ultra-high-energy-cosmic-ray (UHECR) particles detected on Earth since 1962. It will be shown that nuclei of hydrogen, helium, and iron-56, may reach ZeV energies by cyclotron auto-resonance acceleration (by a combination of radiation and super-strong magnetic fields).
Speaker: Dr. Yousef Salamin, American University of Sharjah
Prior to joining AUS, Yousef Salamin taught undergraduate and graduate physics at Birzeit University in Palestine and Freiburg University in Germany. His research work gets more than 100 annual citations. He has been awarded an Abdel Hameed Shoman Prize for Young Arab Scientists, an Alexander von Humboldt Fellowship, a DAAD (German Academic Exchange Program) Guest Lecturer Fellowship, and a Distinguished Scholar Award from the Arab Fund for Economic and Social Development. His current research interests focus on laser-acceleration of particles for medical and industrial applications.