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Spontaneous and Amplified Raadiation at the Initial Stage of a SASE FEL.

DE2003805259

Publication Date	2002
Personal Author	Huang, Z.; Kim, K. J.
Page Count	8
Abstract	At the initial stage of a self-amplified spontaneous emission (SASE) free-electron laser (FEL), spontaneous undulator radiation in certain experimental configurations can dominate the amplified signal over an extended undulator distance. In this paper we study both the spontaneous and the amplified radiation in the framework of the paraxial wave equation and determine the transition from the dominance of spontaneous emission to exponential amplification. We compare theoretical expectations with SASE simulation codes GINER and GENESIS.
Keywords	Free electron lasers Emission Radiation Amplication Electron beams Beam emittance Spice Wave equations Self-amplified spontaneous emission(SASE)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200323

Spontaneous and Amplified Raadiation at the Initial Stage of a SASE FEL.

Spontaneous and Amplified Raadiation at the Initial Stage of a SASE FEL.
DE2003805259

Publication Date	2002
Personal Author	Huang, Z.; Kim, K. J.
Page Count	8
Abstract	At the initial stage of a self-amplified spontaneous emission (SASE) free-electron laser (FEL), spontaneous undulator radiation in certain experimental configurations can dominate the amplified signal over an extended undulator distance. In this paper we study both the spontaneous and the amplified radiation in the framework of the paraxial wave equation and determine the transition from the dominance of spontaneous emission to exponential amplification. We compare theoretical expectations with SASE simulation codes GINER and GENESIS.
Keywords	Free electron lasers Emission Radiation Amplication Electron beams Beam emittance Spice Wave equations Self-amplified spontaneous emission(SASE)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200323