Tapering FEL amplifiers in wiggler period and field

Conference · Sun Mar 12 23:00:00 EST 1989

DOI:https://doi.org/10.1016/0168-9002(89)90445-2· OSTI ID:6085199

Shay, H. D.; Deis, G. A.; Scharlemann, E. T.; Smith, Jr., T. E.

Tapering a free-electron laser (FEL) amplifier to improve extraction after gain saturation can be accomplished by varying both the wiggler period and the wiggler field. This paper considers specific FEL designs and demonstrates the improvement in extraction that can be achieved by utilizing both variations. Fabrication considerations make a continuously varying wiggler period impractical for long wigglers, and so this technique entails discontinuous steps in the wiggler period. Such steps in wiggler period must be introduced in a manner such that they do not introduce steering in the electron beam for reasonable ranges of transverse velocities and energies nor induce a large spread in phase shifts. We discuss such techniques. 8 refs., 7 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6085199
• Report Number(s): UCRL-98850; CONF-8808146-16; ON: DE89014050
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
BEAMS
DESIGN
EFFICIENCY
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTRON BEAMS
EQUIPMENT
FREE ELECTRON LASERS
LASERS
LEPTON BEAMS
MAGNETS
MATHEMATICAL SPACE
PARTICLE BEAMS
PERFORMANCE
PHASE SHIFT
PHASE SPACE
SPACE
TUNING
WIGGLER MAGNETS