Abstract
In this paper, a compact hard X-ray free electron lasers (FEL) design is proposed with all X-band rf acceleration and two stage bunch compression. It eliminates the need of a harmonic rf linearization section by employing optics linearization in its first stage bunch compression. Quadrupoles and sextupoles are employed in a bunch compressor one (BC1) design, in such a way that second order longitudinal dispersion of BC1 cancels the second order energy correlation in the electron beam. Start-to-end 6-D simulations are performed with all the collective effects included. Emittance growth in the horizontal plane due to coherent synchrotron radiation is investigated and minimized, to be on a similar level with the successfully operating Linac coherent light source (LCLS). At a FEL radiation wavelength of 0.15 nm, a saturation length of 40 meters can be achieved by employing an undulator with a period of 1.5 cm. Without tapering, a FEL radiation power above 10 GW is achieved with a photon pulse length of 50 fs, which is LCLS-like performance. The overall length of the accelerator plus undulator is around 250 meters which is much shorter than the LCLS length of 1230 meters. That makes it possible to build hard X-ray FEL in a laboratory with limited size.
Highlights
Free electron lasers (FEL) were proposed by J
In Linac coherent light source (LCLS) a fourth harmonic rf with a frequency of 11.4 GHz is installed before bunch compressor one, to mainly minimize the second order chirp from the main rf which has a frequency of 2.8 GHz [9]
We show a concrete example of free electron lasers (FEL) lasing at 0.15 nm wavelength, which is the same as achieved in LCLS
Summary
Free electron lasers (FEL) were proposed by J. In the first stage of the bunch compression process where the nonlinear impacts are stronger due to an initially longer bunch length, a harmonic rf section is required to compensate the high order main rf curvature and linearize the longitudinal phase space [9,10]. Third order longitudinal dispersion U5666 can be tuned to cancel the third order rf curvature, in most cases this is not necessary as its impact is relatively small This approach is especially interesting for X-band FEL drivers, as it is harder to find and operate harmonic rf, i.e., above 30 GHz. basic formulas of longitudinal motion and bunch compression are derived analytically.
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