Solution to the initial value problem for a high-gain FEL via Van Kampen's method.

Conference · Tue Aug 22 00:00:00 EDT 2000

OSTI ID:761253

Huang, Z; Kim, K -J

Using Van Kampen's normal mode expansion, we solve the initial value problem for a high-gain free-electron laser (FEL) described by the three-dimensional Maxwell-Klimontovich equations. An expression of the radiation spectrum is given for the process of coherent amplification and self-amplified spontaneous emission. It is noted that the input coupling coefficient for either process increases with the initial beam energy spread. The effective start-up noise is identified as the coherent fraction of the spontaneous undulator radiation in one field gain length, and is larger with increasing energy spread and emittance mainly because of the increase in gain length.

• Research Organization: Argonne National Lab., IL (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 761253
• Report Number(s): ANL/ASD/CP-101972; TRN: US0005309
• Resource Relation: Conference: 22nd International Free Electron Laser Conference & 7th Users Workshop, Durham, NC (US), 08/13/2000--08/18/2000; Other Information: PBD: 22 Aug 2000
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
AMPLIFICATION
ANL
FREE ELECTRON LASERS
RADIATIONS
START-UP
WIGGLER MAGNETS