Chinese Physics C > 2015, Vol. 39 > Issue(1): 018101 DOI: 10.1088/1674-1137/39/1/018101

Optimization of single-step tapering amplitude and energy detuning for high-gain FELs

LI He-Ting^,,
JIA Qi-Ka

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Abstract：
We put forward a method to optimize the single-step tapering amplitude of undulator strength and initial energy tuning of electron beam to maximize the saturation power of high gain free-electron lasers (FELs), based on the physics of longitudinal electron beam phase space. Using the FEL simulation code GENESIS, we numerically demonstrate the accuracy of the estimations for parameters corresponding to the linac coherent light source and the Tesla test facility.

References

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Bonifacio R, Pellegrini C, Narducci L M. Opt. Commun., 1984, 50: 373[2] WANG X J et al. Phys. Rev. Lett., 2009, 103: 154801[3] Fawley W M et al. Nucl. Instrum. Methods A, 2002, 483: 537[4] Kroll N M, Morton P L, Rosenbluth M R. IEEE J. Quantum Electron, 1981, 17: 1436[5] Orzechowski T J et al. Phys. Rev. Lett., 1986, 57: 2172[6] JIAO Y et al. Phys. Rev. ST Accel. Beams, 2012, 15: 050704[7] Jaroszynski D A et al. Phys. Rev. Lett., 1993, 70: 3412[8] Reiche S. Nucl. Instrum. Methods A, 1999, 429: 243[9] Linac Coherent Light Source Design Study Report, SLAC-R-521, 1998[10] Rossbach J. Nucl. Instrum. Methods A, 1996, 375: 269[11] WANG X J. Appl. Phys. Lett., 2007, 91: 181115[12] Concept Design Report of Hefei Soft X-ray FEL Facility, May 2006 (in Chinese)

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LI He-Ting and JIA Qi-Ka. Optimization of single-step tapering amplitude and energy detuning for high-gain FELs[J]. Chinese Physics C, 2015, 39(1): 018101. doi: 10.1088/1674-1137/39/1/018101

LI He-Ting and JIA Qi-Ka. Optimization of single-step tapering amplitude and energy detuning for high-gain FELs[J]. Chinese Physics C, 2015, 39(1): 018101. doi:10.1088/1674-1137/39/1/018101 shu

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Received: 2014-03-11
Revised: 2014-07-07

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沈阳化工大学材料科学与工程学院沈阳 110142

Optimization of single-step tapering amplitude and energy detuning for high-gain FELs

LI He-Ting^,
JIA Qi-Ka

Corresponding author:LI He-Ting,

Received Date:2014-03-11
Accepted Date:2014-07-07
Available Online:2015-01-05

Abstract:We put forward a method to optimize the single-step tapering amplitude of undulator strength and initial energy tuning of electron beam to maximize the saturation power of high gain free-electron lasers (FELs), based on the physics of longitudinal electron beam phase space. Using the FEL simulation code GENESIS, we numerically demonstrate the accuracy of the estimations for parameters corresponding to the linac coherent light source and the Tesla test facility.