Transverse Coherence of the LCLS X-Ray Beam

关键词: LIGHT SOURCES;    FREE ELECTRON LASERS;    X RADIATION;    BEAM DYNAMICS;    DIFFRACTION;    COMPUTERIZED SIMULATION;    COHERENT RADIATION XFEL;   

DOI  :  10.2172/993729
RP-ID  :  SLAC-TN-10-060
PID  :  OSTI ID: 993729
Others  :  TRN: US1100055

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Self-amplifying spontaneous radiation free-electron lasers, such as the LCLS or the European X-FEL, rely on the incoherent, spontaneous radiation as the seed for the amplifying process. Though this method overcomes the need for an external seed source one drawback is the incoherence of the effective seed signal. The FEL process allows for a natural growth of the coherence because the radiation phase information is spread out within the bunch due to slippage and diffraction of the radiation field. However, at short wavelengths this spreading is not sufficient to achieve complete coherence. In this presentation we report on the results of numerical simulations of the LCLS X-ray FEL. From the obtained radiation field distribution the coherence properties are extracted to help to characterize the FEL as a light source.