Study of radiation build up and mode evolution in the Israeli electrostatic accelerator free-electron laser oscillator

Author

Abramovich, Amir ; Pinhasi, Yosef ; Yakover, Yosef M. ; Gover, Avraham ; Sokolowski, J.S. ; Canter, Michael

Author_Institution

Fac. of Eng., Tel Aviv Univ., Israel

Volume

27

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

563

Lastpage

567

Abstract

A time-frequency study of oscillation build up in an electrostatic accelerator free-electron laser (EA-FEL) oscillator is presented. The unique features of an EA-FEL are its capacity to operate in a long pulse mode and enable observation and study of linear and nonlinear processes taking place in the evolution of radiation in the EA-FEL oscillator. The experimental data recorded with the aid of a fast digital sampling oscilloscope are analyzed using fast Fourier transform (FFT) signal-processing techniques to obtain the power spectral density evolution with time. Such an analysis allows one to study the radiation excitation build up from noise to saturation, including the intermediate stages of mode build up and competition until single-mode, steady-state operation is established

Keywords

electrostatic accelerators; fast Fourier transforms; free electron lasers; laser frequency stability; laser modes; wigglers; FFT signal-processing techniques; Israeli electrostatic accelerator; digital sampling oscilloscope; free-electron laser oscillator; long pulse mode; mode build up; mode evolution; power spectral density evolution; radiation build up; steady-state operation; time-frequency study; Electrostatics; Fast Fourier transforms; Free electron lasers; Laser modes; Oscillators; Oscilloscopes; Signal analysis; Signal sampling; Steady-state; Time frequency analysis;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.772286

Filename

772286