Theoretical study of a high-extraction efficiency undulator for a free-electron laser oscillator

Conference · Mon Sep 01 04:00:00 EDT 1986

DOI:https://doi.org/10.1016/0168-9002(87)90470-0· OSTI ID:5281414

Takeda, H; McVey, B D; Goldstein, J C

Theoretical issues in designing a high-extraction efficiency undulator for a free-electron laser oscillator are discussed. Assuming that an undulator system consists of a prebuncher undulator and a main undulator separated by a drift, design criteria of the untapered prebuncher are studied. The main undulator is designed parabolically tapered in wave number from no taper to a 30% taper. A small signal gain is enhanced at the low taper section, and the large signal gain is enhanced at the high taper section. To optimize the operation of this prebuncher system, electron dynamics in phase space from the prebuncher to the main undulator is studied. To demonstrate the advantage of having the prebuncher, comparisons of the extraction efficiency and the gain are performed between the prebuncher system and the system with the prebuncher removed. The optimized prebuncher system is then tested for the sideband instability with more complex one-dimensional FEL codes that assume a finite electron pulse and a finite laser pulse length. The electron beam emittance requirement is studied using a three-dimensional FEL simulation code.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5281414
• Report Number(s): LA-UR-86-2974; CONF-8609131-3; ON: DE86015318
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
BREMSSTRAHLUNG
COMPUTER CODES
COMPUTERIZED SIMULATION
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
EXTRACTION
F CODES
FREE ELECTRON LASERS
GAIN
LASER RADIATION
LASERS
OSCILLATORS
RADIATIONS
SEPARATION PROCESSES
SIMULATION
SYNCHROTRON RADIATION