scholarly journals Properties of the third harmonic of the radiation from self-amplified spontaneous emission free electron laser

2006 ◽  
Vol 9 (3) ◽  
Author(s):  
E. L. Saldin ◽  
E. A. Schneidmiller ◽  
M. V. Yurkov
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
Amplified Spontaneous Emission ◽  
Third Harmonic ◽  
The Third

scholarly journals Switching of the harmonic order in free-electron lasers by controlling the density modulation of an electron bunch

2018 ◽  
Vol 25 (5) ◽  
pp. 1317-1322 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
QiKa Jia
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Free Electron Lasers ◽  
Harmonic Order ◽  
Third Harmonic ◽  
X Ray ◽  
The Third ◽  
Density Modulation ◽  
Higher Harmonic

It was demonstrated that harmonic order in free-electron laser (FEL) oscillations could be switched by adjusting the dispersive gap of the optical klystron ETLOK-III in the storage ring NIJI-IV. The effective gains for the fundamental and third-harmonic FEL oscillations were evaluated and it was confirmed that the FEL oscillated at the order of the harmonic with the higher effective gain. The ratio between the effective gain for the fundamental and that for the third harmonic was controlled by the dispersive gap. It was also demonstrated that a spectral measurement of the FEL-based Compton scattering X-ray beam was effective for directly observing the switching of the harmonic order. These results contribute to the development of higher-harmonic FEL oscillations suppressing the fundamental FEL oscillation in the extreme ultraviolet and X-ray regions.

Measurements of Gain Larger than105at12μmin a Self-Amplified Spontaneous-Emission Free-Electron Laser

1998 ◽  
Vol 81 (22) ◽  
pp. 4867-4870 ◽  
Author(s):  
M. J. Hogan ◽  
C. Pellegrini ◽  
J. Rosenzweig ◽  
S. Anderson ◽  
P. Frigola ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
Amplified Spontaneous Emission

Measurements of High Gain and Intensity Fluctuations in a Self-Amplified, Spontaneous-Emission Free-Electron Laser

1998 ◽  
Vol 80 (2) ◽  
pp. 289-292 ◽  
Author(s):  
M. Hogan ◽  
C. Pellegrini ◽  
J. Rosenzweig ◽  
G. Travish ◽  
A. Varfolomeev ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
Amplified Spontaneous Emission ◽  
High Gain ◽  
Intensity Fluctuations

scholarly journals Two-frequency undulator usage in compact self-amplified spontaneous emission free electron laser in Roentgen range

2017 ◽  
Vol 35 (2) ◽  
pp. 326-336 ◽  
Author(s):  
K. Zhukovsky ◽  
I. Potapov
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
High Harmonic ◽  
Amplified Spontaneous Emission ◽  
Energy Spread ◽  
X Ray ◽  
Sase Fel ◽  
Generation Of Harmonics ◽  
Harmonic Power

AbstractThe generation of harmonics in two-frequency undulator in a self-amplified spontaneous emission free electron laser (SASE FEL) is studied in order to produce Roentgen radiation in a relatively compact sized installation. The dynamics of SASE FEL is analyzed with the help of the phenomenological model to obtain the maximum of the X-ray high-harmonic power. The model accounts for the properties of the undulator magnetic field and of the electron beam and includes the major sources of losses, such as the electron energy spread, etc. It is compared and calibrated with the existing data on a FEL experiment. The advantages of the two-frequency undulator for Roentgen SASE FEL are demonstrated and the possibility to generate powerful mild Roentgen radiation at already ~25 m length is shown. The evolution of the bunching coefficients for high harmonics is studied together with the evolution of the FEL-induced energy spread. The linear and non-linear regimes are explored for common and for two-frequency undulators The usage of the two-frequency undulator for cascade SASE FEL with high X-ray harmonic power and high-harmonic bunching coefficients with low-induced energy spread is proposed.

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