PAC07 - List of Authors (Kallos, E.)

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Kallos, E.

Paper	Title	Page
THPMS031	Plasma Wakefield Acceleration Utilizing Multiple Electron Bunches	3070
	E. Kallos, T. C. Katsouleas, P. Muggli USC, Los Angeles, California W. D. Kimura STI, Washington I. Pavlishin, I. Pogorelsky, D. Stolyarov, V. Yakimenko BNL, Upton, Long Island, New York
	Funding: DoE contract # DE-FG02-92-ER40745 We investigate various plasma wakefield accelerator schemes that rely on multiple electron bunches to drive a large amplitude plasma wave, which are followed by a witness bunch at a phase where it will sample the high acceleration gradient and gain energy. Experimental verifications of various two bunch schemes are available in the literature; here we provide analytical calculations and numerical simulations of the wakefield dependency and the transformer ratio when M drive bunches and one witness bunch are fed into a high density plasma, where M is between 2 and 10. This is a favorable setup since the bunches can be adjusted such that the transformer ratio and the efficiency of the accelerator are enhanced compared to single bunch schemes. The possibility of a five bunch ILC afterburner to accelerate a witness bunch from 100 GeV to 500 GeV is also examined.
THPMS032	Plasma Wakefield Acceleration Experiments using Two Subpicosecond Electron Bunches	3073
	P. Muggli, E. Kallos, T. C. Katsouleas USC, Los Angeles, California W. D. Kimura STI, Washington K. Kusche, I. Pavlishin, D. Stolyarov, V. Yakimenko BNL, Upton, Long Island, New York
	Funding: This work is supported by US DoE under contracts DE-FG02-92-ER40745 and DE-FG02-04ER41294. Two ~100 fs electron bunches, separated in energy by approximately 1.8 MeV and in time by 0.5-1 ps, were sent through a capillary discharge plasma. The plasma density was varied from ~1·10¹⁴/cc to ~1·10¹⁷/cc. A 2-D PWFA model indicates the net wakefield produced by the bunches will depend on their relative charge, temporal separation, and the plasma density. This will affect the amount of energy gain or loss of the second bunch. During measurements of the energy spectrum of the second bunch, we observed a difference in the amount of gain or loss depending on the plasma density, which is consistent with the model prediction.
THPMS034	Generation and Characterization of the Microbunched Beams with a Wire Mesh Target	3079
	P. Muggli, E. Kallos USC, Los Angeles, California M. Babzien, K. Kusche, V. Yakimenko BNL, Upton, Long Island, New York W. D. Kimura STI, Washington
	Funding: Work supported by US Department of Energy contract DE-AC02-98CH10886 The presentation will cover experimental results on generation and measurement of the beams with theμbunches length from 1 to 50 microns at Brookhaven Accelerator Test Facility. Arbitrary number of microbunches is sliced out of 5 ps long beam using wire mesh and slits. The details of beam structure are characterized using CSR interferometer and 6 mm long plasma wakefield channel with the controllable plasma density.