FEL2012 - List of Authors (Rax, J.-M.)

Paper	Title	Page
THPD48	Numerical Study of an FEL based on LWFA Electrons and a Laser-plasma Wiggler	642
	R. Lehe, G. Lambert, A. Lifschitz, V. Malka, J.-M. Rax LOA, Palaiseau, France X. Davoine CEA/DAM/DIF, Arpajon, France
	Recent works* have suggested that laser-wakefield acceleration (LWFA) may be used to produce the electron beam of an FEL. However, when using conventional magnetic wigglers, the requirements on the beam quality are very stringent, and are still challenging with current LWFA beams. An interesting alternative may be to use a laser-plasma wiggler (e.g. a plasma wave or a laser beam). Compared to a conventional one, a laser-plasma wiggler has a field amplitude several orders of magnitude higher - which can place lower constraints on the beam quality. Furthermore, since laser-plasma wigglers also have a typically much shorter period, their total wiggler length is correspondingly shorter, and it may therefore not be necessary to periodically refocus the beam along the wiggler. Taking into account these effects, we evaluate the range of wiggler properties (field, period) that would make the FEL process possible. From this analysis, the counterpropagating laser wiggler seems to be one of the most promising solutions. We therefore extend the Ming Xie formula* to a counterpropagating laser wiggler. We use this formula to evaluate the potential use of current state-of-the-art lasers. * Nakajima, K., Nature phys. 4, 92 (2008) Bacci, A. et al., Nucl. Instrum. Methods Phys. Res. A 587, 388 (2008) * Xie, M., Nucl. Instrum. Methods Phys. Res. A 445, 59 (2000)

Paper

Title

Page

Numerical Study of an FEL based on LWFA Electrons and a Laser-plasma Wiggler

642

R. Lehe, G. Lambert, A. Lifschitz, V. Malka, J.-M. Rax
LOA, Palaiseau, France
X. Davoine
CEA/DAM/DIF, Arpajon, France

Recent works* have suggested that laser-wakefield acceleration (LWFA) may be used to produce the electron beam of an FEL. However, when using conventional magnetic wigglers, the requirements on the beam quality are very stringent, and are still challenging with current LWFA beams. An interesting alternative may be to use a laser-plasma wiggler (e.g. a plasma wave or a laser beam). Compared to a conventional one, a laser-plasma wiggler has a field amplitude several orders of magnitude higher - which can place lower constraints on the beam quality. Furthermore, since laser-plasma wigglers also have a typically much shorter period, their total wiggler length is correspondingly shorter, and it may therefore not be necessary to periodically refocus the beam along the wiggler. Taking into account these effects, we evaluate the range of wiggler properties (field, period) that would make the FEL process possible. From this analysis, the counterpropagating laser wiggler** seems to be one of the most promising solutions. We therefore extend the Ming Xie formula*** to a counterpropagating laser wiggler. We use this formula to evaluate the potential use of current state-of-the-art lasers.
* Nakajima, K., Nature phys. 4, 92 (2008)
** Bacci, A. et al., Nucl. Instrum. Methods Phys. Res. A 587, 388 (2008)
*** Xie, M., Nucl. Instrum. Methods Phys. Res. A 445, 59 (2000)