Abstract
We show that a femto-second hard X-ray radiation pulse can be generated in a free-electron laser amplifier without magnetic bunch compressors. This is possible by adopting a very low charge electron beam followed by the velocity bunching (VB) in two accelerating sections in a linear accelerator. With VB, an electron bunch with a bunch charge of 10 pC can be successfully compressed in the presence of the space-charge effect by a factor of 150, from 0.2 ps to 1.3 fs rms. Multi-gigawatt hard X-ray radiation can be generated from a 5-GeV electron beam, saturating in approximately a 40-m distance from the undulator entrance. Various accelerator and electron-beam parameters were optimized using a multi-objective genetic algorithm.
Similar content being viewed by others
References
Linac Coherent Light Source (LCLS) Conceputal Design Report, SLAC-R593, (Stanford Linear Accelerator Center, Stanford, 2002).
M. Borland et al., Nucl. Instrum. Methods A 483, 268 (2002).
E. Saldin, E. Schneidmiller and M. Yurkov, TESLAFEL-2003-02, DESY (2003).
Z. Huang et al., SLAC-PUB-10334, SLAC (2004).
S.G. Anderson et al., in Proceedings of the PAC 2003 (Portland, USA, 2003).
L. Serafini and M. Ferrario, AIP Conf. Proc. 581, 87 (2001).
Ivan V. Bazarov and Charles K. Sinclair, Phys. ReV. ST Accel. Beams 8, 034202 (2005).
Floettmann, ASTRA User Manual, see http://www.desy.de/~mpyflo/Astra_dokumentation/.
B. Beutner et al., Velocity bunching at FLASH, in Proceedings of EPAC 2008 (Genoa, USA, 2008).
K. Deb, Multi-objective Optimization using Evolutionary Algorithms (John Wiley & Sons, Chichester, 2001).
K. Deb, S. Agrawal, A. Pratap and T. Meyarivan, IEEE Trans. Evolutionary Computation (IEEE-TEC) 6, 182 (2002).
I. Bazarov and C. Sinclair, Phys. Rev. St Accel. Beams 8, 034202 (2008).
D. H. Dowell et al., SLAC-PUB-12951, SLAC (2007).
M. Borland, elegant: A flexible SDDS-Compilant Code for Accelerator Simulation, APS LS-287 (2000).
S. Reiche, Nucl. Instrum. Meth. Phys. Res., Sect. A 429, 243 (1999).
R. Bonifacio, L. De Salvo, P. Pierini, N. Piovella and C. Pellegrini, Phys. Rev. Lett. 73, 70 (1994).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lee, J., Oh, B.H. & Yoon, M. A compact hard X-ray free-electron laser based on velocity bunching. Journal of the Korean Physical Society 63, 1262–1267 (2013). https://doi.org/10.3938/jkps.63.1262
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.63.1262