FEL2012 - List of Authors (Lehe, R.)

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)

FROA03

The LUNEX5 Project

678

M.-E. Couprie
CEA/DSM, Gif-sur-Yvette, France
C. Benabderrahmane, P. Betinelli-Deck, F. Bouvet, A. Buteau, L. Cassinari, J. Daillant, J.-C. Denard, C. Evain, P. Eymard, B. Gagey, C. Herbeaux, M. Labat, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, C. Miron, P. Morin, A. Nadji, F. Polack, J.B. Pruvost, F. Ribeiro, J.P. Ricaud, P. Roy, T. Tanikawa
SOLEIL, Gif-sur-Yvette, France
S. Bielawski, C. Szwaj
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
B. Carré
CEA, Gif-sur-Yvette, France
J. Chavanne, L. Farvacque, G. Lebec
ESRF, Grenoble, France
X. Davoine
CEA/DAM/DIF, Arpajon, France
G. Devanz, M. Luong
CEA/DSM/IRFU, France
A. Dubois, J. Lüning
CCPMR, Paris, France
G. Lambert, R. Lehe, A. Lifschitz, V. Malka, A. Rousse, K. Ta Phuoc, C. Thaury
LOA, Palaiseau, France
R. Roux
LAL, Orsay, France

LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, and coherent pulses in the soft X-ray region (with two particular targeted wavelengths of 20 and 13 nm on the fundamental wavelength). The project consists of a Free Electron Laser (FEL) line enabling the most advanced seeding configurations (High order Harmonic in Gas seeding and Echo Enable Harmonic Generation) and in-vacuum (potentially cryogenic) undulators of 15 and 30 mm period. Two accelerator types feed this FEL line : a Conventional Linear Accelerator (CLA) with superconducting cavities of 400 MeV for the investigations of the advanced FEL schemes, compatible with a future up-grade for high repetition rate; and a 0.4 - 1 GeV Laser Wake Field Accelerator (LWFA), to be qualified in view of FEL application, in the single spike or seeded regime. Two pilot user experiments for time-resolved studies of isolated species and solid state matter dynamics will take benefit of LUNEX5 FEL radiation and provide feedback of the performance of the different schemes under real user conditions.

Slides FROA03 [25.321 MB]

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)

FROA03	The LUNEX5 Project	678
	M.-E. Couprie CEA/DSM, Gif-sur-Yvette, France C. Benabderrahmane, P. Betinelli-Deck, F. Bouvet, A. Buteau, L. Cassinari, J. Daillant, J.-C. Denard, C. Evain, P. Eymard, B. Gagey, C. Herbeaux, M. Labat, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, C. Miron, P. Morin, A. Nadji, F. Polack, J.B. Pruvost, F. Ribeiro, J.P. Ricaud, P. Roy, T. Tanikawa SOLEIL, Gif-sur-Yvette, France S. Bielawski, C. Szwaj PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France B. Carré CEA, Gif-sur-Yvette, France J. Chavanne, L. Farvacque, G. Lebec ESRF, Grenoble, France X. Davoine CEA/DAM/DIF, Arpajon, France G. Devanz, M. Luong CEA/DSM/IRFU, France A. Dubois, J. Lüning CCPMR, Paris, France G. Lambert, R. Lehe, A. Lifschitz, V. Malka, A. Rousse, K. Ta Phuoc, C. Thaury LOA, Palaiseau, France R. Roux LAL, Orsay, France
	LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, and coherent pulses in the soft X-ray region (with two particular targeted wavelengths of 20 and 13 nm on the fundamental wavelength). The project consists of a Free Electron Laser (FEL) line enabling the most advanced seeding configurations (High order Harmonic in Gas seeding and Echo Enable Harmonic Generation) and in-vacuum (potentially cryogenic) undulators of 15 and 30 mm period. Two accelerator types feed this FEL line : a Conventional Linear Accelerator (CLA) with superconducting cavities of 400 MeV for the investigations of the advanced FEL schemes, compatible with a future up-grade for high repetition rate; and a 0.4 - 1 GeV Laser Wake Field Accelerator (LWFA), to be qualified in view of FEL application, in the single spike or seeded regime. Two pilot user experiments for time-resolved studies of isolated species and solid state matter dynamics will take benefit of LUNEX5 FEL radiation and provide feedback of the performance of the different schemes under real user conditions.
	Slides FROA03 [25.321 MB]