FEL principle 黄志戎 (Zhirong Huang),自由电子激光原理,1,行业借鉴#,1D theory,Lecture Outline,SASE and XFEL,FEL R 0.1um emittance; 5 fs (50 pC) 5-m SC undulator lu = 1 cm, au = 1.41 (G. Fuchert, NIMA 2012) Radiation wavelength l1 = 3.9 nm For TGU, dispersion h = 0.01 m, sx = 100um, sy = 15um,Compact XFELs driven by LPA,49,行业借鉴#,HW1,An experimenter places a monochromator with 1 eV bandwidth centered at 10 keV photon energy after the LCLS beam. If the SASE pulse length is estimated to be 10 fs fwhm. What is the expected rms intensity fluctuation for the filtered radiation?,行业借鉴#,HW2,How many 10 keV photons per pulse for 2 mJ hard x-ray FEL? Assuming SASE has 100% transverse coherence, the fwhm pulse duration is 50 fs. What is the number of photons per mode (the degeneracy parameter)? In this context, discuss what is the benefit of seeding?,行业借鉴#,