FEL2014 - List of Keywords (scattering)

Paper	Title	Other Keywords	Page
MOP092	X-ray Monochromators for Self-seeding XFELs in the Photon Energy Range Starting from 1.5 keV	photon, FEL, electron, radiation	269
	Yu. Shvyd'ko ANL, Argonne, Ilinois, USA
	Self-seeding of XFELs below 1 keV can be performed using grating monochromators [1]. Forward-Bragg diffraction (wake) monochromators [2] were instrumental for achieving self-seeding in hard x-ray FELs in the photon energy range from 5 to 10 keV [3]. Large photo-absorption makes extension into the lower photon range difficult. Here alternative schemes of x-ray monochromators are introduced and discussed for achieving self-seeding in a yet inaccessible spectral range starting from 1.5 keV. [1] J. Feldhaus, et al., Opt. Commun. 140, 341 (1997). [2]. G. Geloni, V. Kocharyan, and E. Saldin, J. Mod. Opt. 58, 1391 (2011). [3] J. Amann, et al., Nat. Photonics 6, 693 (2012).

TUP017	Using Lorentz Transformations for Simulations of Wiggler Superradiance from the Picosecond Electron Bunches	electron, undulator, simulation, radiation	395
	A. Malkin, N.S. Ginzburg, A.A. Golovanov, I.V. Zotova IAP/RAS, Nizhny Novgorod, Russia V.P. Tarakanov LPI, Moscow, Russia
	Funding: This work was supported by Russian Foundation for Basic Research under Grant No 12-02-01152. In this paper we present a theoretical analysis of superradiance (SR) from picosecond electron bunches wiggling in periodical undulator field based both on the method of averaged ponderomotive force and on a direct numerical PIC (particle-in-cell) simulation. Within both approaches the analysis takes place in the reference frame co-moving with electrons which allows simplifying the procedure of simulation significantly due to the fact that all the spatial scales including the radiation wavelength, the length of the beam and the length of the pump field pacet into which the undulator field is transformed are of the same order. We show that in the reference frame the SR effect can be interpreted as a formation of the distributed Bragg mirror in the bulk of the electron beam which is effectively reflecting (scattering) the pump wave. A possibility of generation of multimegawatt pulses in terahertz and far infrared wave ranges is demonstrated.

Paper

Title

Other Keywords

Page

MOP092

X-ray Monochromators for Self-seeding XFELs in the Photon Energy Range Starting from 1.5 keV

photon, FEL, electron, radiation

269

Yu. Shvyd'ko
ANL, Argonne, Ilinois, USA

Self-seeding of XFELs below 1 keV can be performed using grating monochromators [1]. Forward-Bragg diffraction (wake) monochromators [2] were instrumental for achieving self-seeding in hard x-ray FELs in the photon energy range from 5 to 10 keV [3]. Large photo-absorption makes extension into the lower photon range difficult. Here alternative schemes of x-ray monochromators are introduced and discussed for achieving self-seeding in a yet inaccessible spectral range starting from 1.5 keV.
[1] J. Feldhaus, et al., Opt. Commun. 140, 341 (1997).
[2]. G. Geloni, V. Kocharyan, and E. Saldin, J. Mod. Opt. 58, 1391 (2011).
[3] J. Amann, et al., Nat. Photonics 6, 693 (2012).

TUP017

Using Lorentz Transformations for Simulations of Wiggler Superradiance from the Picosecond Electron Bunches

electron, undulator, simulation, radiation

395

A. Malkin, N.S. Ginzburg, A.A. Golovanov, I.V. Zotova
IAP/RAS, Nizhny Novgorod, Russia
V.P. Tarakanov
LPI, Moscow, Russia

Funding: This work was supported by Russian Foundation for Basic Research under Grant No 12-02-01152.
In this paper we present a theoretical analysis of superradiance (SR) from picosecond electron bunches wiggling in periodical undulator field based both on the method of averaged ponderomotive force and on a direct numerical PIC (particle-in-cell) simulation. Within both approaches the analysis takes place in the reference frame co-moving with electrons which allows simplifying the procedure of simulation significantly due to the fact that all the spatial scales including the radiation wavelength, the length of the beam and the length of the pump field pacet into which the undulator field is transformed are of the same order. We show that in the reference frame the SR effect can be interpreted as a formation of the distributed Bragg mirror in the bulk of the electron beam which is effectively reflecting (scattering) the pump wave. A possibility of generation of multimegawatt pulses in terahertz and far infrared wave ranges is demonstrated.