The Gain Equation of a Helical Wiggler Free Electron Laser with Ion-Channel Guiding and/or an Axial Magnetic Field

2013 ◽  
Vol 30 (3) ◽  
pp. 034102 ◽  
Author(s):  
Taghi Mohsenpour ◽  
Hassan Ehsani Amri
Keyword(s):  
Magnetic Field ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser ◽  
Axial Magnetic Field

Comparison of self-fields effects in two-stream electromagnetically pumped FEL with ion-channel guiding and axial magnetic field

2011 ◽  
Vol 77 (6) ◽  
pp. 765-776 ◽  
Author(s):  
S. SAVIZ ◽  
H. MEHDIAN ◽  
FARZIN M. AGHAMIR ◽  
M. GHORANNEVIS ◽  
A. A. ASHKARRAN
Keyword(s):  
Magnetic Field ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser ◽  
Axial Magnetic Field ◽  
Small Region ◽  
Numerical Calculations ◽  
Small Signal Gain ◽  
Small Signal ◽  
Electron Trajectories

AbstractA theory of two-stream free-electron laser in a combined electromagnetic wiggler and an ion-channel guiding is developed. In the analysis, the electron trajectories and the small signal gain are derived by considering the effects of self-fields. Numerical calculations show that there are seven group's trajectories rather than nine groups reported in Mehdian and Saviz (2010 Chin. Phys. B 19(1), 014214). The comparison of the normalized gains and their corresponding normalized frequencies by employing the axial magnetic field and ion-channel guiding, with and without self-fields, in FEL has been studied numerically. The results show that the normalized maximum gain in FEL with axial magnetic is larger than that for using ion-channel guiding except in small region, but the results for their corresponding normalized frequencies are opposite.

A comparison between electron orbits for both an axial magnetic field and an ion-channel guiding in a FEL with an electromagnetic wave wiggler

2008 ◽  
Vol 74 (2) ◽  
pp. 187-196 ◽  
Author(s):  
H. MEHDIAN ◽  
S. JAFARI
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser ◽  
Large Amplitude ◽  
Electromagnetic Waves ◽  
Axial Magnetic Field ◽  
Numerical Study ◽  
Guide Magnetic Field

AbstractThe operation of a free-electron laser (FEL) with electromagnetic wave wiggler in the presence of an ion-channel guiding as well as an axial guide magnetic field is considered and compared. Theoretical studies of electron trajectories and dispersion relations in a combined ion electrostatic field as well as large-amplitude backward-propagating electromagnetic waves are analyzed. The large-amplitude wave acts like a magnetostatic wiggler in a FEL. The results of a numerical study are presented and discussed. It is shown that in the wiggler pumped ion-channel free-electron laser (WPIC-FEL), electron orbits and dispersion relation are time-dependent, and over time, electron orbits while oscillating bear a periodic motion.

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