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Generation of Attosecond X-Ray Pulses with a Multi-Cycle Two Color ESASE Scheme.

DE2008939109

Publication Date	2008
Personal Author	Ding, Y.; Huang, Z.; Ratner, D.; Bucksbaum, P.; Merdji, H.
Page Count	4
Abstract	Generation of attosecond x-ray pulses is attracting much attention within the x-ray free-electron laser (FEL) user community. Several schemes have been proposed based on manipulations of electron bunches with extremely short laser pulses. In this paper, we extend the attosecond two-color ESASE scheme proposed by Zholents et al. to the long optical cycle regime using a detuned second laser and a tapered undulator. Both lasers can be about ten-optical-cycles long, with the second laser frequency detuned from the first one to optimize the contrast between the central and side current spikes. A tapered undulator mitigates the degradation effect of the longitudinal space charge (LSC) force in the undulator and suppresses the FEL gain of all side current spikes. Simulations using the LCLS parameters show a single attosecond x-ray spike of (approx) 110 attosecond can be produced with a good contrast ratio.
Keywords	Electrons Free electron lasers Lasers Space charge Wiggle magnets
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200910

Generation of Attosecond X-Ray Pulses with a Multi-Cycle Two Color ESASE Scheme.

Generation of Attosecond X-Ray Pulses with a Multi-Cycle Two Color ESASE Scheme.
DE2008939109

Publication Date	2008
Personal Author	Ding, Y.; Huang, Z.; Ratner, D.; Bucksbaum, P.; Merdji, H.
Page Count	4
Abstract	Generation of attosecond x-ray pulses is attracting much attention within the x-ray free-electron laser (FEL) user community. Several schemes have been proposed based on manipulations of electron bunches with extremely short laser pulses. In this paper, we extend the attosecond two-color ESASE scheme proposed by Zholents et al. to the long optical cycle regime using a detuned second laser and a tapered undulator. Both lasers can be about ten-optical-cycles long, with the second laser frequency detuned from the first one to optimize the contrast between the central and side current spikes. A tapered undulator mitigates the degradation effect of the longitudinal space charge (LSC) force in the undulator and suppresses the FEL gain of all side current spikes. Simulations using the LCLS parameters show a single attosecond x-ray spike of (approx) 110 attosecond can be produced with a good contrast ratio.
Keywords	Electrons Free electron lasers Lasers Space charge Wiggle magnets
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200910