PAC09 - List of Authors (Capatina, D.)

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Capatina, D.

Paper	Title	Page
MO6RFP046	Optimized Design of an Ultra-Low Emittance Injector for Future X-Ray FEL Oscillator	461
	P.N. Ostroumov, D. Capatina, K.-J. Kim, S.A. Kondrashev, B. Mustapha, R. Nassiri ANL, Argonne
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. The concept of an ultra-low transverse emittance injector operating in CW mode for an XFELO* was discussed at LINAC-08*. Here we will report the design optimization of the injector, which includes a 100 MHz RF-gun with thermionic cathode, an energy filter to produce short bunches (~0.5 nsec), a velocity bunching section, higher harmonic cavities to minimize longitudinal emittance, two bunch compressors and accelerating sections operating at 400 MHz and 1300 MHz to obtain 540 MeV electrons. The proposed design is capable of producing 40 pC bunches with 0.5 psec rms time width and 0.7 MeV rms energy spread. Most significantly, the transverse rms emittance is kept below 0.11 π μm. The longitudinal emittance and bunch time width can be substantially reduced for low-charge bunches of several pC. K.-J. Kim, Y. Shvyd’ko, and S. Reiche, Phys. Rev. Lett., 100 244802 (2008). **P.N. Ostroumov, K.-J. Kim, Ph. Piot, Proceedings of the Linac-2008.

Paper

Title

Page

MO6RFP046

Optimized Design of an Ultra-Low Emittance Injector for Future X-Ray FEL Oscillator

461

P.N. Ostroumov, D. Capatina, K.-J. Kim, S.A. Kondrashev, B. Mustapha, R. Nassiri
ANL, Argonne

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.

The concept of an ultra-low transverse emittance injector operating in CW mode for an XFELO* was discussed at LINAC-08**. Here we will report the design optimization of the injector, which includes a 100 MHz RF-gun with thermionic cathode, an energy filter to produce short bunches (~0.5 nsec), a velocity bunching section, higher harmonic cavities to minimize longitudinal emittance, two bunch compressors and accelerating sections operating at 400 MHz and 1300 MHz to obtain 540 MeV electrons. The proposed design is capable of producing 40 pC bunches with 0.5 psec rms time width and 0.7 MeV rms energy spread. Most significantly, the transverse rms emittance is kept below 0.11 π μm. The longitudinal emittance and bunch time width can be substantially reduced for low-charge bunches of several pC.

*K.-J. Kim, Y. Shvyd’ko, and S. Reiche, Phys. Rev. Lett., 100 244802 (2008).
**P.N. Ostroumov, K.-J. Kim, Ph. Piot, Proceedings of the Linac-2008.