简介: |
主讲人简介：
Chan Joshi is a Distinguished Professor of Electrical Engineering at University of California Los Angeles, UCLA. He is also the Director of Center for High Frequency Electronics and heads the Neptune Laboratory for Advanced Accelerator Research at UCLA.
Professor Chan Joshi is known worldwide for developing the field of laser and electron beam-driven plasma based particle accelerators over the past two decades. Joshi’s UCLA group was the first to conclusively demonstrate the acceleration of electrons using relativistically propagating plasma waves. Initially such waves were excited using a laser beam using two different schemes called the Laser Beat Wave Accelerator and the Self-Modulated Laser Wakefield Accelerator. This was followed by a series of elegant beam-driven plasma particle acceleration experiments using high-energy electron and positron beams at the Stanford Linear Accelerator Center. In collaboration with two other groups, from SLAC and University of Southern California, Joshi’s group has shown energy doubling of 42 GeV electrons from the SLAC linac in less than a meter of plasma, opening a way to build ultra compact high-energy accelerators.
Professor Joshi is a Fellow of the APS, IEEE and Institute of Physics (U.K.). The accelerator, plasma physics and laser communities have recognized the interdisciplinary nature of Professor Joshi’s work. He is the recipient of American Physical Society’s James Clerk Maxwell Prize (2006) and the Excellence in Plasma Physics Award (1996), USPAS prize for Achievement in Accelerator Physics and Technology (1997), 2008 Advanced Acceleration Concepts Prize and IEEE Particle Accelerator Science and Technology Award (2009). He served as APS Centennial Speaker (1999) and Distinguished Lecturer in Plasma Physics (2001).
报告摘要：
Accelerator-based experiments have produced key breakthroughs in our understanding of the physical world. New accelerators, to explore the frontiers of Terascale Physics, appear possible, based on concepts developed over the last three decades in multi-disciplinary endeavors. The Laser and Beam-Driven Plasma Accelerator is one concept that has made spectacular advances in the last few years. In this scheme, electrons or positrons gain energy by surfing the electric field of a plasma wave that is produced by the passage of an intense laser pulse or an electron beam through the plasma. Laser-driven plasma accelerators are now routinely producing several hundred MeV energy high quality electron beams in a plasma structure that is only a few millimeters in length. Beam-driven plasma accelerators have shown greater than 40 GeV energy gains in a meter scale plasma accelerator. These advances have prompted the U.S. Department of Energy to announce a substantial increase in funding for this area of research through the establishment of two new facilities , FACET at SLAC and BELLA at LBNL.This talk reviews the principles of this technique , scientific opportunities for FACET and BELLA and prognosticates how this scheme for particle acceleration is likely to impact science and technology in the future.
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