2024 : 7 : 19
Ali Akbar Ashkarran

Ali Akbar Ashkarran

Academic rank: Assistant Professor
ORCID:
Education: PhD.
ScopusId:
Faculty:
Address:
Phone: 01135302485

Research

Title
Comparison of self-fields effects in two-stream electromagnetically pumped FEL with ion-channel guiding and axial magnetic field
Type
JournalPaper
Keywords
self-fields effects two-stream electromagnetically pumped FEL ion-channel axial magnetic field
Year
2011
Journal JOURNAL OF PLASMA PHYSICS
DOI
Researchers Shahrooz Saviz ، Hassan Mehdian ، Farzin M.Aghamir ، Mohammad Ghorannevis ، Ali Akbar Ashkarran

Abstract

A 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.