高兆兰讲座（五）（7月30日 周一 15:00-16:30）

主持人：董建文 教授

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报告摘要：

Today, high brightness and highly relativistic electron beams are generated by circular or linear accelerators (LINAC) typically operating with 1-3 GHz accelerating frequencies and approaches towards X-band frequencies in the 10 GHz range are maturing. The achievable accelerating gradients are limited by field emission from cavity walls or pulsed heating to several tens of MV/m in the case of low frequencies and up to 100 MV/m in the case of X-band frequencies. Moving up in frequency to the THz range, here hundreds of GHz, experimentally confirmed  scaling laws predict the realization of few-hundred MV/m to 1 GV/m accelerating fields in LINACs and guns, respectively. The high field strength and field gradients enable direct generation of single femtosecond electron bunches with substantial charge in the pC-range from very compact devices.  We will discuss highly efficient laser based THz generation by optical rectification and first results towards THz based electron guns, LINACs and beam manipulations with the final goal to construct a hard-X-ray source producing attosecond pulses.

报告人简介：

Franz X. Kärtner received his Diploma and Ph.D. degree in Electrical Engineering from Technical University Munich in 1986 and 1989, respectively and a Habilitation degree in Experimental Physics at ETH-Zürich in1997. After faculty positions at University of Karlsruhe (TH) and MIT, he joined in 2011 the Center for Free-Electron Laser Science (CFEL) at DESY, and is Professor of Physics at University of Hamburg, and Adjunct Professor of Electrical Engineering at Massachusetts Institute of Technology (MIT). His research is focused on few-cycle and ultralow jitter femtosecond lasers for optical metrology, attosecond science and compact x-ray source technology. He is a fellow of the IEEE and OSA.