PAC07 - List of Authors (Kusche, K.)

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Kusche, K.

Paper	Title	Page
TUPMS033	Chicane Radiation Measurements with a Compressed Electron Beam at the BNL ATF	1254
	G. Andonian, R. B. Agustsson, A. M. Cook, M. P. Dunning, E. Hemsing, A. Y. Murokh, S. Reiche, J. B. Rosenzweig UCLA, Los Angeles, California M. Babzien, K. Kusche, R. Malone, V. Yakimenko BNL, Upton, Long Island, New York
	The radiation emitted from a chicane compressor has been studied at the Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF). Coherent edge radiation (CER)is emitted from a compressed electron beam as it traverses sharp edge regions of a magnet. The compression is accompanied by strong self-fields, which are manifested as distortions in the momentum space called beam bifurcation. Recent measurements indicate that the bunch length is approximately 100 fs rms. The emitted THz chicane radiation displays strong signatures of CER. This paper reports on the experimental characterization and subsequent analysis of the chicane radiation measurements at the BNL ATF with a discussion of diagnostics development and implementation. The characterization includes spectral analysis, far-field intensity distribution, and polarization effects. Experimental data is benchmarked to a custom developed start-to-end simulation suite.
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.
FRPMS059	Generation and Analysis of Subpicosecond Double Electron Bunch at the Brookhaven Accelerator Test Facility	4132
	X. P. Ding, D. B. Cline UCLA, Los Angeles, California M. Babzien, K. Kusche, V. Yakimenko BNL, Upton, Long Island, New York W. D. Kimura STI, Washington F. Zhou SLAC, Menlo Park, California
	Funding: U. S.DOE of Science Two compressed electron beam bunches from a single 60-MeV bunch have been generated in a reproducible manner during compression in the magnetic chicane - "dog leg" arrangement at ATF. Measurements indicate they have comparable bunch lengths (~100-200 fs) and are separated in energy by ~1.8 MeV with the higher-energy bunch preceding the lower-energy bunch by 0.5-1 ps. Some simulation results for analyzing the double-bunch formation process are also presented.