Field evolution of harmonic radiation in an HGHG FEL

Field evolution of harmonic radiation in an HGHG FEL 1 2 first-author 1 1 corresp Corresponding author. E-mail address: daizhimin@sinap.ac.cn Corresponding author. E-mail address: daizhimin@sinap.ac.cn daizhimin@sinap.ac.cn Shanghai Institute of Applied Physics,Chinese Academy of Sciences, Shanghai 201800, China Shanghai Institute of Applied Physics,Chinese Academy of Sciences, Shanghai 201800, China Graduate University of the Chinese Academy of Sciences, Beijing100049, China Graduate University of the Chinese Academy of Sciences, Beijing100049, China As a natural character of high gain free electron laser (FEL), harmonic radiation is regarded as the natural extensions to short wavelengths. In high gain harmonic generation (HGHG) scheme, harmonic evolution may be attributed to the initial harmonic bunching, self amplification of the harmonic radiation, electron beam strongly bunched by the fundamental radiation, the faster longitudinal dynamics and the fundamental synchrotron oscillation. It is more complex than harmonic evolution in other FEL schemes. In this paper, via theoretical analyses and three dimensional simulations, a general description of different aspects of harmonic evolution in the HGHG process is presented. Harmonic FEL HGHG Nonlinearity References Pellegrini C . Nucl Instrum Methods Phys Res A , 1988 , 272 : 364 - 367 . Nucl Instrum Methods Phys Res A Yu L H . Phys Rev A , 1991 , 44 : 5178 - 5193 . Phys Rev A Yu L H , Babzien M , Ben-Zvi I , et al . Nucl Instrum Methods Phys Res A , 2000 , 445 : 301 - 306 . Nucl Instrum Methods Phys Res A Reiche S , Pellegrini C , Rosenzweig J , et al . Nucl Instrum Methods Phys Res A , 2002 , 483 : 70 - 74 . Nucl Instrum Methods Phys Res A Jaeschke E , et al . Nucl Instrum Methods Phys Res A , 2005 , 543 : 85 - 89 . Nucl Instrum Methods Phys Res A Bonifacio R , Salvo L De , Pierini P . Nucl Instrum Methods Phys Res A , 1990 , 293 : 627 - 629 . Nucl Instrum Methods Phys Res A Huang Z , Kim K J . Phys Rev E , 2000 , 62 : 7295 - 7308 . Phys Rev E Jia Q K . IEEE J Quantum Electron , 2007 , 43 : 833 - 837 . IEEE J Quantum Electron Freund H P , Biedron S G , Milton S V . Nucl Instrum Methods Phys Res A , 2000 , 445 : 53 - 58 . Nucl Instrum Methods Phys Res A Biedron S G , Huang Z , Kim K J , et al . Nucl Instrum Methods Phys Res A , 2002 , 483 : 101 - 106 . Nucl Instrum Methods Phys Res A Tremaine A , Wang X J , Babzien M , et al . Phys Rev Lett , 2002 , 88 : 204801 . Phys Rev Lett Tremaine A , Wang X J , Babzien M , et al . Nucl Instrum Methods Phys Res A , 2003 , 507 : 445 - 449 . Nucl Instrum Methods Phys Res A Deng H X , Dai Z M . Chin Phys C , 2008 , 32 : 297 - 302 . Chin Phys C Bonifacio R , De Salvo L , Pierini P , et al . Nucl Instrum Methods Phys Res A , 1990 , 296 : 787 - 790 . Nucl Instrum Methods Phys Res A Xie M , Deacon D , Nucl Instrum Methods Phys Res A , 1986 , 250 : 426 - 431 . Nucl Instrum Methods Phys Res A Kong X C , Wang J Q , Wang S H , et al . Shanghai soft X-ray FEL test facility conceptual design report , 2008 , Shanghai , Chapter 2 : 1 - 20 . Shanghai soft X-ray FEL test facility conceptual design report Reiche S . Proceeding of PAC07 , Albuquerque, New Mexico, USA , 2007 , 1269 - 1271 . Yu L H , Wu J H . Nucl Instrum Methods Phys Res A , 2002 , 483 : 493 - 498 . Nucl Instrum Methods Phys Res A Latham P E , Levush B , Antonsen T M , et al . Phys Rev Lett , 1991 , 66 : 1442 - 1445 . Phys Rev Lett Deng H X , Dai Z M . Nucl Sci Tech , 2008 , 19 : 7 - 12 . Nucl Sci Tech Giannessi L , Musumeci P . New J Phys , 2006 , 8 : 294 . New J Phys 10.1016/S1001-8042(09)60002-6 TN248.6 Partially supported by the Key Project for Promoting Fundamental Research in China (Grant No. 2002CB713600) 2008-07-09 2008-10-20 2021-01-19 2008 Nuclear Science and Techniques 05 19